ImmutableArray<T> Struct

Definition

Namespace:

System.Collections.Immutable

Assembly:

System.Collections.Immutable.dll

Source:

ImmutableArray_1.cs

Represents an array that is immutable; meaning it cannot be changed once it is created.

NuGet package: System.Collections.Immutable (about immutable collections and how to install)

generic <typename T>
public value class ImmutableArray : IEquatable<System::Collections::Immutable::ImmutableArray<T>>, System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Collections::Generic::IList<T>, System::Collections::Generic::IReadOnlyCollection<T>, System::Collections::Generic::IReadOnlyList<T>, System::Collections::IList, System::Collections::Immutable::IImmutableList<T>, System::Collections::IStructuralComparable, System::Collections::IStructuralEquatable

public readonly struct ImmutableArray<T> : IEquatable<System.Collections.Immutable.ImmutableArray<T>>, System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.IList<T>, System.Collections.Generic.IReadOnlyCollection<T>, System.Collections.Generic.IReadOnlyList<T>, System.Collections.IList, System.Collections.Immutable.IImmutableList<T>, System.Collections.IStructuralComparable, System.Collections.IStructuralEquatable

type ImmutableArray<'T> = struct
    interface ICollection<'T>
    interface seq<'T>
    interface IEnumerable
    interface IList<'T>
    interface IReadOnlyCollection<'T>
    interface IReadOnlyList<'T>
    interface ICollection
    interface IList
    interface IImmutableList<'T>

Public Structure ImmutableArray(Of T)
Implements ICollection(Of T), IEnumerable(Of T), IEquatable(Of ImmutableArray(Of T)), IImmutableList(Of T), IList, IList(Of T), IReadOnlyCollection(Of T), IReadOnlyList(Of T), IStructuralComparable, IStructuralEquatable

Type Parameters

T

The type of element stored by the array.

Inheritance

Object

ValueType

ImmutableArray<T>

Implements

ICollection<T> IEnumerable<T> IList<T> IReadOnlyCollection<T> IReadOnlyList<T> ICollection IEnumerable IList IImmutableList<T> IStructuralComparable IStructuralEquatable IEquatable<ImmutableArray<T>>

Examples

This example shows how to create an immutable array and iterate over elements in it:

// Create an immutable array of numbers
ImmutableArray<int> numbers = ImmutableArray.Create(1, 2, 3, 4, -1, -2);

// Iterate over all items in the array and print them
foreach (int n in numbers)
{
    Console.Write(n);
    Console.Write(' ');
}
// Output: 1 2 3 4 -1 -2

This example shows how to create a new immutable array by adding and removing items from the original array:

ImmutableArray<int> numbers2 = numbers.RemoveAt(0).Add(-3);
// numbers2 will contain: 2 3 4 -1 -2 -3

This example shows how to create an immutable array using ImmutableArray<T>.Builder:

// Create immutable array builder
ImmutableArray<int>.Builder builder = ImmutableArray.CreateBuilder<int>();

// Iterate over all items in the original array and add positive elements to the builder
for (int i = 0; i < numbers.Length; i++)
{
    if (numbers[i] > 0) builder.Add(numbers[i]);
}

// Create an immutable array from the contents of the builder
ImmutableArray<int> numbers3 = builder.ToImmutable();
// numbers3 will contain: 1 2 3 4

Remarks

There are different scenarios best for ImmutableArray<T> and others best for ImmutableList<T>.

Reasons to use immutable array:

• Updating the data is rare or the number of elements is quite small (less than 16 items)
• You need to be able to iterate over the data in performance critical sections
• You have many instances of immutable collections and you can't afford keeping the data in trees

Reasons to use immutable list:

• Updating the data is common or the number of elements isn't expected to be small
• Updating the collection is more performance critical than iterating the contents

The following table summarizes the performance characteristics of ImmutableArray<T>

Operation	ImmutableArray complexity	ImmutableList complexity	Comments
Item	O(1)	O(log n)	Directly index into the underlying array
Add()	O(n)	O(log n)	Requires creating a new array

Fields

Empty

Gets an empty immutable array.

Properties

IsDefault	Gets a value indicating whether this array was declared but not initialized.
IsDefaultOrEmpty	Gets a value indicating whether this ImmutableArray<T> is empty or is not initialized.
IsEmpty	Gets a value indicating whether this ImmutableArray<T> is empty.
Item[Int32]	Gets the element at the specified index in the immutable array.
Length	Gets the number of elements in the array.

Methods

Add(T)	Returns a copy of the original array with the specified item added to the end.
AddRange(IEnumerable<T>)	Returns a copy of the original array with the specified elements added to the end of the array.
AddRange(ImmutableArray<T>, Int32)	Adds the specified items to the end of the array.
AddRange(ImmutableArray<T>)	Returns a copy of the original array with the specified elements added to the end of the array.
AddRange(ReadOnlySpan<T>)	Adds the specified values to this list.
AddRange(T[], Int32)	Adds the specified items to the end of the array.
AddRange(T[])	Adds the specified values to this list.
AddRange<TDerived>(ImmutableArray<TDerived>)	Adds the specified items to the end of the array.
AddRange<TDerived>(TDerived[])	Adds the specified items to the end of the array.
As<TOther>()	Returns a new immutable array that contains the elements of this array cast to a different type.
AsMemory()	Creates a new read-only memory region over this immutable array.
AsSpan()	Creates a new read-only span over this immutable array.
AsSpan(Int32, Int32)	Creates a ReadOnlySpan<T> over the portion of the current ImmutableArray<T>, beginning at a specified position for a specified length.
AsSpan(Range)	Creates a span over the portion of the current ImmutableArray<T> based on the specified range.
CastArray<TOther>()	Initializes a new instance of the ImmutableArray<T> struct by casting the underlying array to an array of type TOther.
CastUp<TDerived>(ImmutableArray<TDerived>)	Initializes a new instance of the ImmutableArray<T> struct based on the contents of an existing instance, allowing a covariant static cast to efficiently reuse the existing array.
Clear()	Returns an array with all the elements removed.
Contains(T, IEqualityComparer<T>)	Determines whether the specified item exists in the array.
Contains(T)	Determines whether the specified item exists in the array.
CopyTo(Int32, T[], Int32, Int32)	Copies the specified items in this array to the specified array at the specified starting index.
CopyTo(Span<T>)	Copies the elements of current ImmutableArray<T> to a Span<T>.
CopyTo(T[], Int32)	Copies the contents of this array to the specified array starting at the specified destination index.
CopyTo(T[])	Copies the contents of this array to the specified array.
Equals(ImmutableArray<T>)	Indicates whether specified array is equal to this array.
Equals(Object)	Determines if this array is equal to the specified object.
GetEnumerator()	Returns an enumerator that iterates through the contents of the array.
GetHashCode()	Returns a hash code for this instance.
IndexOf(T, Int32, IEqualityComparer<T>)	Searches the array for the specified item.
IndexOf(T, Int32, Int32, IEqualityComparer<T>)	Searches the array for the specified item.
IndexOf(T, Int32, Int32)	Searches the array for the specified item.
IndexOf(T, Int32)	Searches the array for the specified item.
IndexOf(T)	Searches the array for the specified item.
Insert(Int32, T)	Returns a new array with the specified value inserted at the specified position.
InsertRange(Int32, IEnumerable<T>)	Inserts the specified values at the specified index.
InsertRange(Int32, ImmutableArray<T>)	Inserts the specified values at the specified index.
InsertRange(Int32, ReadOnlySpan<T>)	Inserts the specified values at the specified index.
InsertRange(Int32, T[])	Inserts the specified values at the specified index.
ItemRef(Int32)	Gets a read-only reference to the element at the specified index in the read-only list.
LastIndexOf(T, Int32, Int32, IEqualityComparer<T>)	Searches the array for the specified item; starting at the end of the array.
LastIndexOf(T, Int32, Int32)	Searches the array for the specified item; starting at the end of the array.
LastIndexOf(T, Int32)	Searches the array for the specified item; starting at the end of the array.
LastIndexOf(T)	Searches the array for the specified item; starting at the end of the array.
OfType<TResult>()	Filters the elements of this array to those assignable to the specified type.
Remove(T, IEqualityComparer<T>)	Returns an array with the first occurrence of the specified element removed from the array. If no match is found, the current array is returned.
Remove(T)	Returns an array with the first occurrence of the specified element removed from the array. If no match is found, the current array is returned.
RemoveAll(Predicate<T>)	Removes all the items from the array that meet the specified condition.
RemoveAt(Int32)	Returns an array with the element at the specified position removed.
RemoveRange(IEnumerable<T>, IEqualityComparer<T>)	Removes the specified items from this array.
RemoveRange(IEnumerable<T>)	Removes the specified items from this array.
RemoveRange(ImmutableArray<T>, IEqualityComparer<T>)	Removes the specified items from this list.
RemoveRange(ImmutableArray<T>)	Removes the specified values from this list.
RemoveRange(Int32, Int32)	Returns an array with the elements at the specified position removed.
RemoveRange(ReadOnlySpan<T>, IEqualityComparer<T>)	Removes the specified values from this list.
RemoveRange(T[], IEqualityComparer<T>)	Removes the specified values from this list.
Replace(T, T, IEqualityComparer<T>)	Finds the first element in the array equal to the specified value and replaces the value with the specified new value.
Replace(T, T)	Finds the first element in the array equal to the specified value and replaces the value with the specified new value.
SetItem(Int32, T)	Replaces the item at the specified index with the specified item.
Slice(Int32, Int32)	Forms a slice out of the current ImmutableArray<T> starting at a specified index for a specified length.
Sort()	Sorts the elements in the immutable array using the default comparer.
Sort(Comparison<T>)	Sorts the elements in the entire ImmutableArray<T> using the specified Comparison<T>.
Sort(IComparer<T>)	Sorts the elements in the immutable array using the specified comparer.
Sort(Int32, Int32, IComparer<T>)	Sorts the specified elements in the immutable array using the specified comparer.
ToBuilder()	Creates a mutable array that has the same contents as this array and can be efficiently mutated across multiple operations using standard mutable interfaces.

Operators

Equality(ImmutableArray<T>, ImmutableArray<T>)	Returns a value that indicates if two arrays are equal.
Equality(Nullable<ImmutableArray<T>>, Nullable<ImmutableArray<T>>)	Returns a value that indicates if two arrays are equal.
Inequality(ImmutableArray<T>, ImmutableArray<T>)	Returns a value that indicates whether two arrays are not equal.
Inequality(Nullable<ImmutableArray<T>>, Nullable<ImmutableArray<T>>)	Checks for inequality between two array.

Explicit Interface Implementations

ICollection.CopyTo(Array, Int32)	Copies this array to another array starting at the specified index.
ICollection.Count	Gets the size of the array.
ICollection.IsSynchronized	See the ICollection interface. Always returns true since since immutable collections are thread-safe.
ICollection.SyncRoot	Gets the sync root.
ICollection<T>.Add(T)	Throws NotSupportedException in all cases.
ICollection<T>.Clear()	Throws NotSupportedException in all cases.
ICollection<T>.Count	Gets the number of items in the collection.
ICollection<T>.IsReadOnly	Gets a value indicating whether this instance is read only.
ICollection<T>.Remove(T)	Throws NotSupportedException in all cases.
IEnumerable.GetEnumerator()	Returns an enumerator that iterates through the immutable array.
IEnumerable<T>.GetEnumerator()	Returns an enumerator that iterates through the array.
IImmutableList<T>.Add(T)	Returns a copy of the original array with the specified item added to the end.
IImmutableList<T>.AddRange(IEnumerable<T>)	Returns a copy of the original array with the specified elements added to the end of the array.
IImmutableList<T>.Clear()	Returns an array with all the elements removed.
IImmutableList<T>.Insert(Int32, T)	Returns a new array with the specified value inserted at the specified position.
IImmutableList<T>.InsertRange(Int32, IEnumerable<T>)	Inserts the specified values at the specified index.
IImmutableList<T>.Remove(T, IEqualityComparer<T>)	Returns an array with the first occurrence of the specified element removed from the array; if no match is found, the current array is returned.
IImmutableList<T>.RemoveAll(Predicate<T>)	Removes all the items from the array that meet the specified condition.
IImmutableList<T>.RemoveAt(Int32)	Returns an array with the element at the specified position removed.
IImmutableList<T>.RemoveRange(IEnumerable<T>, IEqualityComparer<T>)	Removes the specified items from this array.
IImmutableList<T>.RemoveRange(Int32, Int32)	Returns an array with the elements at the specified position removed.
IImmutableList<T>.Replace(T, T, IEqualityComparer<T>)	Finds the first element in the array equal to the specified value and replaces the value with the specified new value.
IImmutableList<T>.SetItem(Int32, T)	Replaces the item at the specified index with the specified item.
IList.Add(Object)	Throws NotSupportedException in all cases.
IList.Clear()	Throws NotSupportedException in all cases.
IList.Contains(Object)	Throws NotSupportedException in all cases.
IList.IndexOf(Object)	Gets the value at the specified index.
IList.Insert(Int32, Object)	Throws NotSupportedException in all cases.
IList.IsFixedSize	Gets a value indicating whether this instance is fixed size.
IList.IsReadOnly	Gets a value indicating whether this instance is read only.
IList.Item[Int32]	Gets or sets the Object at the specified index.
IList.Remove(Object)	Throws NotSupportedException in all cases.
IList.RemoveAt(Int32)	Throws NotSupportedException in all cases.
IList<T>.Insert(Int32, T)	Throws NotSupportedException in all cases.
IList<T>.Item[Int32]	Gets or sets the element at the specified index in the read-only list.
IList<T>.RemoveAt(Int32)	Throws NotSupportedException in all cases.
IReadOnlyCollection<T>.Count	Gets the number of items in the collection.
IReadOnlyList<T>.Item[Int32]	Gets the element at the specified index.
IStructuralComparable.CompareTo(Object, IComparer)	Determines whether the current collection element precedes, occurs in the same position as, or follows another element in the sort order.
IStructuralEquatable.Equals(Object, IEqualityComparer)	Determines whether this array is structurally equal to the specified array.
IStructuralEquatable.GetHashCode(IEqualityComparer)	Returns a hash code for the current instance.

Extension Methods

ToFrozenDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)	Creates a FrozenDictionary<TKey,TValue> from an IEnumerable<T> according to specified key selector function.
ToFrozenDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)	Creates a FrozenDictionary<TKey,TValue> from an IEnumerable<T> according to specified key selector and element selector functions.
ToFrozenSet<T>(IEnumerable<T>, IEqualityComparer<T>)	Creates a FrozenSet<T> with the specified values.
AsReadOnly<T>(IList<T>)	Returns a read-only ReadOnlyCollection<T> wrapper for the specified list.
BinarySearch<T>(ImmutableArray<T>, T, IComparer<T>)	Searches a sorted immutable array for a specified element and returns the zero-based index of the element, if it's found.
BinarySearch<T>(ImmutableArray<T>, T)	Searches the sorted immutable array for a specified element using the default comparer and returns the zero-based index of the element, if it's found.
BinarySearch<T>(ImmutableArray<T>, Int32, Int32, T, IComparer<T>)	Searches a sorted immutable array for a specified element and returns the zero-based index of the element.
BinarySearch<T>(ImmutableArray<T>, Int32, Int32, T)	Searches a sorted immutable array for a specified element and returns the zero-based index of the element, if it's found.
ToImmutableArray<TSource>(IEnumerable<TSource>)	Creates an immutable array from the specified collection.
ToImmutableDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)	Constructs an immutable dictionary based on some transformation of a sequence.
ToImmutableDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)	Constructs an immutable dictionary from an existing collection of elements, applying a transformation function to the source keys.
ToImmutableDictionary<TSource,TKey,TValue>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TValue>, IEqualityComparer<TKey>, IEqualityComparer<TValue>)	Enumerates and transforms a sequence, and produces an immutable dictionary of its contents by using the specified key and value comparers.
ToImmutableDictionary<TSource,TKey,TValue>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TValue>, IEqualityComparer<TKey>)	Enumerates and transforms a sequence, and produces an immutable dictionary of its contents by using the specified key comparer.
ToImmutableDictionary<TSource,TKey,TValue>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TValue>)	Enumerates and transforms a sequence, and produces an immutable dictionary of its contents.
ToImmutableHashSet<TSource>(IEnumerable<TSource>, IEqualityComparer<TSource>)	Enumerates a sequence, produces an immutable hash set of its contents, and uses the specified equality comparer for the set type.
ToImmutableHashSet<TSource>(IEnumerable<TSource>)	Enumerates a sequence and produces an immutable hash set of its contents.
IndexOf<T>(IImmutableList<T>, T, IEqualityComparer<T>)	Searches for the specified object and returns the zero-based index of the first occurrence within the list.
IndexOf<T>(IImmutableList<T>, T, Int32, Int32)	Searches for the specified object and returns the zero-based index of the first occurrence within the range of elements in the immutable list that extends from the specified index to the last element.
IndexOf<T>(IImmutableList<T>, T, Int32)	Searches for the specified object and returns the zero-based index of the first occurrence within the range of elements in the immutable list that extends from the specified index to the last element.
IndexOf<T>(IImmutableList<T>, T)	Searches for the specified object and returns the zero-based index of the first occurrence within the list.
LastIndexOf<T>(IImmutableList<T>, T, IEqualityComparer<T>)	Searches for the specified object and returns the zero-based index of the last occurrence within the entire immutable list.
LastIndexOf<T>(IImmutableList<T>, T, Int32, Int32)	Searches for the specified object and returns the zero-based index of the last occurrence within the range of elements in the immutable list that extends from the first element to the specified index.
LastIndexOf<T>(IImmutableList<T>, T, Int32)	Searches for the specified object and returns the zero-based index of the last occurrence within the range of elements in the immutable list that extends from the first element to the specified index.
LastIndexOf<T>(IImmutableList<T>, T)	Searches for the specified object and returns the zero-based index of the last occurrence within the entire immutable list.
Remove<T>(IImmutableList<T>, T)	Removes the specified value from this list.
RemoveRange<T>(IImmutableList<T>, IEnumerable<T>)	Removes the specified values from this list.
Replace<T>(IImmutableList<T>, T, T)	Replaces the first equal element in the list with the specified element.
ToImmutableList<TSource>(IEnumerable<TSource>)	Enumerates a sequence and produces an immutable list of its contents.
ToImmutableSortedDictionary<TSource,TKey,TValue>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TValue>, IComparer<TKey>, IEqualityComparer<TValue>)	Enumerates and transforms a sequence, and produces an immutable sorted dictionary of its contents by using the specified key and value comparers.
ToImmutableSortedDictionary<TSource,TKey,TValue>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TValue>, IComparer<TKey>)	Enumerates and transforms a sequence, and produces an immutable sorted dictionary of its contents by using the specified key comparer.
ToImmutableSortedDictionary<TSource,TKey,TValue>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TValue>)	Enumerates and transforms a sequence, and produces an immutable sorted dictionary of its contents.
ToImmutableSortedSet<TSource>(IEnumerable<TSource>, IComparer<TSource>)	Enumerates a sequence, produces an immutable sorted set of its contents, and uses the specified comparer.
ToImmutableSortedSet<TSource>(IEnumerable<TSource>)	Enumerates a sequence and produces an immutable sorted set of its contents.
CopyToDataTable<T>(IEnumerable<T>, DataTable, LoadOption, FillErrorEventHandler)	Copies DataRow objects to the specified DataTable, given an input IEnumerable<T> object where the generic parameter T is DataRow.
CopyToDataTable<T>(IEnumerable<T>, DataTable, LoadOption)	Copies DataRow objects to the specified DataTable, given an input IEnumerable<T> object where the generic parameter T is DataRow.
CopyToDataTable<T>(IEnumerable<T>)	Returns a DataTable that contains copies of the DataRow objects, given an input IEnumerable<T> object where the generic parameter T is DataRow.
Aggregate<TSource>(IEnumerable<TSource>, Func<TSource,TSource,TSource>)	Applies an accumulator function over a sequence.
Aggregate<TSource,TAccumulate>(IEnumerable<TSource>, TAccumulate, Func<TAccumulate,TSource,TAccumulate>)	Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value.
Aggregate<TSource,TAccumulate,TResult>(IEnumerable<TSource>, TAccumulate, Func<TAccumulate,TSource,TAccumulate>, Func<TAccumulate,TResult>)	Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value.
AggregateBy<TSource,TKey,TAccumulate>(IEnumerable<TSource>, Func<TSource, TKey>, TAccumulate, Func<TAccumulate,TSource,TAccumulate>, IEqualityComparer<TKey>)	Applies an accumulator function over a sequence, grouping results by key.
AggregateBy<TSource,TKey,TAccumulate>(IEnumerable<TSource>, Func<TSource, TKey>, Func<TKey,TAccumulate>, Func<TAccumulate,TSource,TAccumulate>, IEqualityComparer<TKey>)	Applies an accumulator function over a sequence, grouping results by key.
All<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Determines whether all elements of a sequence satisfy a condition.
Any<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Determines whether any element of a sequence satisfies a condition.
Any<TSource>(IEnumerable<TSource>)	Determines whether a sequence contains any elements.
Append<TSource>(IEnumerable<TSource>, TSource)	Appends a value to the end of the sequence.
AsEnumerable<TSource>(IEnumerable<TSource>)	Returns the input typed as IEnumerable<T>.
Average<TSource>(IEnumerable<TSource>, Func<TSource,Decimal>)	Computes the average of a sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource,Double>)	Computes the average of a sequence of Double values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource,Int32>)	Computes the average of a sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>)	Computes the average of a sequence of Int64 values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Decimal>>)	Computes the average of a sequence of nullable Decimal values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Double>>)	Computes the average of a sequence of nullable Double values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int32>>)	Computes the average of a sequence of nullable Int32 values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int64>>)	Computes the average of a sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Single>>)	Computes the average of a sequence of nullable Single values that are obtained by invoking a transform function on each element of the input sequence.
Average<TSource>(IEnumerable<TSource>, Func<TSource,Single>)	Computes the average of a sequence of Single values that are obtained by invoking a transform function on each element of the input sequence.
Cast<TResult>(IEnumerable)	Casts the elements of an IEnumerable to the specified type.
Chunk<TSource>(IEnumerable<TSource>, Int32)	Splits the elements of a sequence into chunks of size at most size.
Concat<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)	Concatenates two sequences.
Contains<TSource>(IEnumerable<TSource>, TSource, IEqualityComparer<TSource>)	Determines whether a sequence contains a specified element by using a specified IEqualityComparer<T>.
Contains<TSource>(IEnumerable<TSource>, TSource)	Determines whether a sequence contains a specified element by using the default equality comparer.
Count<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Returns a number that represents how many elements in the specified sequence satisfy a condition.
Count<TSource>(IEnumerable<TSource>)	Returns the number of elements in a sequence.
CountBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)	Returns the count of elements in the source sequence grouped by key.
DefaultIfEmpty<TSource>(IEnumerable<TSource>, TSource)	Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty.
DefaultIfEmpty<TSource>(IEnumerable<TSource>)	Returns the elements of the specified sequence or the type parameter's default value in a singleton collection if the sequence is empty.
Distinct<TSource>(IEnumerable<TSource>, IEqualityComparer<TSource>)	Returns distinct elements from a sequence by using a specified IEqualityComparer<T> to compare values.
Distinct<TSource>(IEnumerable<TSource>)	Returns distinct elements from a sequence by using the default equality comparer to compare values.
DistinctBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)	Returns distinct elements from a sequence according to a specified key selector function and using a specified comparer to compare keys.
DistinctBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)	Returns distinct elements from a sequence according to a specified key selector function.
ElementAt<TSource>(IEnumerable<TSource>, Index)	Returns the element at a specified index in a sequence.
ElementAt<TSource>(IEnumerable<TSource>, Int32)	Returns the element at a specified index in a sequence.
ElementAtOrDefault<TSource>(IEnumerable<TSource>, Index)	Returns the element at a specified index in a sequence or a default value if the index is out of range.
ElementAtOrDefault<TSource>(IEnumerable<TSource>, Int32)	Returns the element at a specified index in a sequence or a default value if the index is out of range.
Except<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)	Produces the set difference of two sequences by using the specified IEqualityComparer<T> to compare values.
Except<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)	Produces the set difference of two sequences by using the default equality comparer to compare values.
ExceptBy<TSource,TKey>(IEnumerable<TSource>, IEnumerable<TKey>, Func<TSource,TKey>, IEqualityComparer<TKey>)	Produces the set difference of two sequences according to a specified key selector function.
ExceptBy<TSource,TKey>(IEnumerable<TSource>, IEnumerable<TKey>, Func<TSource,TKey>)	Produces the set difference of two sequences according to a specified key selector function.
First<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Returns the first element in a sequence that satisfies a specified condition.
First<TSource>(IEnumerable<TSource>)	Returns the first element of a sequence.
FirstOrDefault<TSource>(IEnumerable<TSource>, TSource)	Returns the first element of a sequence, or a specified default value if the sequence contains no elements.
FirstOrDefault<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>, TSource)	Returns the first element of the sequence that satisfies a condition, or a specified default value if no such element is found.
FirstOrDefault<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Returns the first element of the sequence that satisfies a condition or a default value if no such element is found.
FirstOrDefault<TSource>(IEnumerable<TSource>)	Returns the first element of a sequence, or a default value if the sequence contains no elements.
GroupBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)	Groups the elements of a sequence according to a specified key selector function and compares the keys by using a specified comparer.
GroupBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)	Groups the elements of a sequence according to a specified key selector function.
GroupBy<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)	Groups the elements of a sequence according to a key selector function. The keys are compared by using a comparer and each group's elements are projected by using a specified function.
GroupBy<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)	Groups the elements of a sequence according to a specified key selector function and projects the elements for each group by using a specified function.
GroupBy<TSource,TKey,TResult>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TKey,IEnumerable<TSource>,TResult>, IEqualityComparer<TKey>)	Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. The keys are compared by using a specified comparer.
GroupBy<TSource,TKey,TResult>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TKey,IEnumerable<TSource>,TResult>)	Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key.
GroupBy<TSource,TKey,TElement,TResult>(IEnumerable<TSource>, Func<TSource, TKey>, Func<TSource,TElement>, Func<TKey,IEnumerable<TElement>, TResult>, IEqualityComparer<TKey>)	Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. Key values are compared by using a specified comparer, and the elements of each group are projected by using a specified function.
GroupBy<TSource,TKey,TElement,TResult>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, Func<TKey,IEnumerable<TElement>,TResult>)	Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. The elements of each group are projected by using a specified function.
GroupJoin<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,IEnumerable<TInner>, TResult>, IEqualityComparer<TKey>)	Correlates the elements of two sequences based on key equality and groups the results. A specified IEqualityComparer<T> is used to compare keys.
GroupJoin<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,IEnumerable<TInner>, TResult>)	Correlates the elements of two sequences based on equality of keys and groups the results. The default equality comparer is used to compare keys.
Index<TSource>(IEnumerable<TSource>)	Returns an enumerable that incorporates the element's index into a tuple.
Intersect<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)	Produces the set intersection of two sequences by using the specified IEqualityComparer<T> to compare values.
Intersect<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)	Produces the set intersection of two sequences by using the default equality comparer to compare values.
IntersectBy<TSource,TKey>(IEnumerable<TSource>, IEnumerable<TKey>, Func<TSource,TKey>, IEqualityComparer<TKey>)	Produces the set intersection of two sequences according to a specified key selector function.
IntersectBy<TSource,TKey>(IEnumerable<TSource>, IEnumerable<TKey>, Func<TSource,TKey>)	Produces the set intersection of two sequences according to a specified key selector function.
Join<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,TInner,TResult>, IEqualityComparer<TKey>)	Correlates the elements of two sequences based on matching keys. A specified IEqualityComparer<T> is used to compare keys.
Join<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,TInner,TResult>)	Correlates the elements of two sequences based on matching keys. The default equality comparer is used to compare keys.
Last<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Returns the last element of a sequence that satisfies a specified condition.
Last<TSource>(IEnumerable<TSource>)	Returns the last element of a sequence.
LastOrDefault<TSource>(IEnumerable<TSource>, TSource)	Returns the last element of a sequence, or a specified default value if the sequence contains no elements.
LastOrDefault<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>, TSource)	Returns the last element of a sequence that satisfies a condition, or a specified default value if no such element is found.
LastOrDefault<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Returns the last element of a sequence that satisfies a condition or a default value if no such element is found.
LastOrDefault<TSource>(IEnumerable<TSource>)	Returns the last element of a sequence, or a default value if the sequence contains no elements.
LongCount<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Returns an Int64 that represents how many elements in a sequence satisfy a condition.
LongCount<TSource>(IEnumerable<TSource>)	Returns an Int64 that represents the total number of elements in a sequence.
Max<TSource>(IEnumerable<TSource>, IComparer<TSource>)	Returns the maximum value in a generic sequence.
Max<TSource>(IEnumerable<TSource>, Func<TSource,Decimal>)	Invokes a transform function on each element of a sequence and returns the maximum Decimal value.
Max<TSource>(IEnumerable<TSource>, Func<TSource,Double>)	Invokes a transform function on each element of a sequence and returns the maximum Double value.
Max<TSource>(IEnumerable<TSource>, Func<TSource,Int32>)	Invokes a transform function on each element of a sequence and returns the maximum Int32 value.
Max<TSource>(IEnumerable<TSource>, Func<TSource,Int64>)	Invokes a transform function on each element of a sequence and returns the maximum Int64 value.
Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Decimal>>)	Invokes a transform function on each element of a sequence and returns the maximum nullable Decimal value.
Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Double>>)	Invokes a transform function on each element of a sequence and returns the maximum nullable Double value.
Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int32>>)	Invokes a transform function on each element of a sequence and returns the maximum nullable Int32 value.
Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int64>>)	Invokes a transform function on each element of a sequence and returns the maximum nullable Int64 value.
Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Single>>)	Invokes a transform function on each element of a sequence and returns the maximum nullable Single value.
Max<TSource>(IEnumerable<TSource>, Func<TSource,Single>)	Invokes a transform function on each element of a sequence and returns the maximum Single value.
Max<TSource>(IEnumerable<TSource>)	Returns the maximum value in a generic sequence.
Max<TSource,TResult>(IEnumerable<TSource>, Func<TSource,TResult>)	Invokes a transform function on each element of a generic sequence and returns the maximum resulting value.
MaxBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IComparer<TKey>)	Returns the maximum value in a generic sequence according to a specified key selector function and key comparer.
MaxBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)	Returns the maximum value in a generic sequence according to a specified key selector function.
Min<TSource>(IEnumerable<TSource>, IComparer<TSource>)	Returns the minimum value in a generic sequence.
Min<TSource>(IEnumerable<TSource>, Func<TSource,Decimal>)	Invokes a transform function on each element of a sequence and returns the minimum Decimal value.
Min<TSource>(IEnumerable<TSource>, Func<TSource,Double>)	Invokes a transform function on each element of a sequence and returns the minimum Double value.
Min<TSource>(IEnumerable<TSource>, Func<TSource,Int32>)	Invokes a transform function on each element of a sequence and returns the minimum Int32 value.
Min<TSource>(IEnumerable<TSource>, Func<TSource,Int64>)	Invokes a transform function on each element of a sequence and returns the minimum Int64 value.
Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Decimal>>)	Invokes a transform function on each element of a sequence and returns the minimum nullable Decimal value.
Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Double>>)	Invokes a transform function on each element of a sequence and returns the minimum nullable Double value.
Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int32>>)	Invokes a transform function on each element of a sequence and returns the minimum nullable Int32 value.
Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int64>>)	Invokes a transform function on each element of a sequence and returns the minimum nullable Int64 value.
Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Single>>)	Invokes a transform function on each element of a sequence and returns the minimum nullable Single value.
Min<TSource>(IEnumerable<TSource>, Func<TSource,Single>)	Invokes a transform function on each element of a sequence and returns the minimum Single value.
Min<TSource>(IEnumerable<TSource>)	Returns the minimum value in a generic sequence.
Min<TSource,TResult>(IEnumerable<TSource>, Func<TSource,TResult>)	Invokes a transform function on each element of a generic sequence and returns the minimum resulting value.
MinBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IComparer<TKey>)	Returns the minimum value in a generic sequence according to a specified key selector function and key comparer.
MinBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)	Returns the minimum value in a generic sequence according to a specified key selector function.
OfType<TResult>(IEnumerable)	Filters the elements of an IEnumerable based on a specified type.
Order<T>(IEnumerable<T>, IComparer<T>)	Sorts the elements of a sequence in ascending order.
Order<T>(IEnumerable<T>)	Sorts the elements of a sequence in ascending order.
OrderBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IComparer<TKey>)	Sorts the elements of a sequence in ascending order by using a specified comparer.
OrderBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)	Sorts the elements of a sequence in ascending order according to a key.
OrderByDescending<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IComparer<TKey>)	Sorts the elements of a sequence in descending order by using a specified comparer.
OrderByDescending<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)	Sorts the elements of a sequence in descending order according to a key.
OrderDescending<T>(IEnumerable<T>, IComparer<T>)	Sorts the elements of a sequence in descending order.
OrderDescending<T>(IEnumerable<T>)	Sorts the elements of a sequence in descending order.
Prepend<TSource>(IEnumerable<TSource>, TSource)	Adds a value to the beginning of the sequence.
Reverse<TSource>(IEnumerable<TSource>)	Inverts the order of the elements in a sequence.
Select<TSource,TResult>(IEnumerable<TSource>, Func<TSource,TResult>)	Projects each element of a sequence into a new form.
Select<TSource,TResult>(IEnumerable<TSource>, Func<TSource,Int32,TResult>)	Projects each element of a sequence into a new form by incorporating the element's index.
SelectMany<TSource,TResult>(IEnumerable<TSource>, Func<TSource,IEnumerable<TResult>>)	Projects each element of a sequence to an IEnumerable<T> and flattens the resulting sequences into one sequence.
SelectMany<TSource,TResult>(IEnumerable<TSource>, Func<TSource,Int32,IEnumerable<TResult>>)	Projects each element of a sequence to an IEnumerable<T>, and flattens the resulting sequences into one sequence. The index of each source element is used in the projected form of that element.
SelectMany<TSource,TCollection,TResult>(IEnumerable<TSource>, Func<TSource,IEnumerable<TCollection>>, Func<TSource,TCollection,TResult>)	Projects each element of a sequence to an IEnumerable<T>, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein.
SelectMany<TSource,TCollection,TResult>(IEnumerable<TSource>, Func<TSource,Int32,IEnumerable<TCollection>>, Func<TSource,TCollection,TResult>)	Projects each element of a sequence to an IEnumerable<T>, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein. The index of each source element is used in the intermediate projected form of that element.
SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)	Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparer<T>.
SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)	Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type.
Single<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Returns the only element of a sequence that satisfies a specified condition, and throws an exception if more than one such element exists.
Single<TSource>(IEnumerable<TSource>)	Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence.
SingleOrDefault<TSource>(IEnumerable<TSource>, TSource)	Returns the only element of a sequence, or a specified default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.
SingleOrDefault<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>, TSource)	Returns the only element of a sequence that satisfies a specified condition, or a specified default value if no such element exists; this method throws an exception if more than one element satisfies the condition.
SingleOrDefault<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Returns the only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition.
SingleOrDefault<TSource>(IEnumerable<TSource>)	Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.
Skip<TSource>(IEnumerable<TSource>, Int32)	Bypasses a specified number of elements in a sequence and then returns the remaining elements.
SkipLast<TSource>(IEnumerable<TSource>, Int32)	Returns a new enumerable collection that contains the elements from source with the last count elements of the source collection omitted.
SkipWhile<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements.
SkipWhile<TSource>(IEnumerable<TSource>, Func<TSource,Int32,Boolean>)	Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements. The element's index is used in the logic of the predicate function.
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Decimal>)	Computes the sum of the sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Double>)	Computes the sum of the sequence of Double values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Int32>)	Computes the sum of the sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Int64>)	Computes the sum of the sequence of Int64 values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Decimal>>)	Computes the sum of the sequence of nullable Decimal values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Double>>)	Computes the sum of the sequence of nullable Double values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int32>>)	Computes the sum of the sequence of nullable Int32 values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int64>>)	Computes the sum of the sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Single>>)	Computes the sum of the sequence of nullable Single values that are obtained by invoking a transform function on each element of the input sequence.
Sum<TSource>(IEnumerable<TSource>, Func<TSource,Single>)	Computes the sum of the sequence of Single values that are obtained by invoking a transform function on each element of the input sequence.
Take<TSource>(IEnumerable<TSource>, Int32)	Returns a specified number of contiguous elements from the start of a sequence.
Take<TSource>(IEnumerable<TSource>, Range)	Returns a specified range of contiguous elements from a sequence.
TakeLast<TSource>(IEnumerable<TSource>, Int32)	Returns a new enumerable collection that contains the last count elements from source.
TakeWhile<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Returns elements from a sequence as long as a specified condition is true.
TakeWhile<TSource>(IEnumerable<TSource>, Func<TSource,Int32,Boolean>)	Returns elements from a sequence as long as a specified condition is true. The element's index is used in the logic of the predicate function.
ToArray<TSource>(IEnumerable<TSource>)	Creates an array from a IEnumerable<T>.
ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)	Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function and key comparer.
ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)	Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function.
ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)	Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function, a comparer, and an element selector function.
ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)	Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to specified key selector and element selector functions.
ToHashSet<TSource>(IEnumerable<TSource>, IEqualityComparer<TSource>)	Creates a HashSet<T> from an IEnumerable<T> using the comparer to compare keys.
ToHashSet<TSource>(IEnumerable<TSource>)	Creates a HashSet<T> from an IEnumerable<T>.
ToList<TSource>(IEnumerable<TSource>)	Creates a List<T> from an IEnumerable<T>.
ToLookup<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)	Creates a Lookup<TKey,TElement> from an IEnumerable<T> according to a specified key selector function and key comparer.
ToLookup<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)	Creates a Lookup<TKey,TElement> from an IEnumerable<T> according to a specified key selector function.
ToLookup<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)	Creates a Lookup<TKey,TElement> from an IEnumerable<T> according to a specified key selector function, a comparer and an element selector function.
ToLookup<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)	Creates a Lookup<TKey,TElement> from an IEnumerable<T> according to specified key selector and element selector functions.
TryGetNonEnumeratedCount<TSource>(IEnumerable<TSource>, Int32)	Attempts to determine the number of elements in a sequence without forcing an enumeration.
Union<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)	Produces the set union of two sequences by using a specified IEqualityComparer<T>.
Union<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)	Produces the set union of two sequences by using the default equality comparer.
UnionBy<TSource,TKey>(IEnumerable<TSource>, IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)	Produces the set union of two sequences according to a specified key selector function.
UnionBy<TSource,TKey>(IEnumerable<TSource>, IEnumerable<TSource>, Func<TSource,TKey>)	Produces the set union of two sequences according to a specified key selector function.
Where<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)	Filters a sequence of values based on a predicate.
Where<TSource>(IEnumerable<TSource>, Func<TSource,Int32,Boolean>)	Filters a sequence of values based on a predicate. Each element's index is used in the logic of the predicate function.
Zip<TFirst,TSecond>(IEnumerable<TFirst>, IEnumerable<TSecond>)	Produces a sequence of tuples with elements from the two specified sequences.
Zip<TFirst,TSecond,TThird>(IEnumerable<TFirst>, IEnumerable<TSecond>, IEnumerable<TThird>)	Produces a sequence of tuples with elements from the three specified sequences.
Zip<TFirst,TSecond,TResult>(IEnumerable<TFirst>, IEnumerable<TSecond>, Func<TFirst,TSecond,TResult>)	Applies a specified function to the corresponding elements of two sequences, producing a sequence of the results.
Aggregate<T>(ImmutableArray<T>, Func<T,T,T>)	Applies a function to a sequence of elements in a cumulative way.
Aggregate<TAccumulate,T>(ImmutableArray<T>, TAccumulate, Func<TAccumulate,T,TAccumulate>)	Applies a function to a sequence of elements in a cumulative way.
Aggregate<TAccumulate,TResult,T>(ImmutableArray<T>, TAccumulate, Func<TAccumulate,T,TAccumulate>, Func<TAccumulate,TResult>)	Applies a function to a sequence of elements in a cumulative way.
All<T>(ImmutableArray<T>, Func<T,Boolean>)	Gets a value indicating whether all elements in this array match a given condition.
Any<T>(ImmutableArray<T>, Func<T,Boolean>)	Gets a value indicating whether the array contains any elements that match a specified condition.
Any<T>(ImmutableArray<T>)	Gets a value indicating whether the array contains any elements.
ElementAt<T>(ImmutableArray<T>, Int32)	Returns the element at a specified index in the array.
ElementAtOrDefault<T>(ImmutableArray<T>, Int32)	Returns the element at a specified index in a sequence or a default value if the index is out of range.
First<T>(ImmutableArray<T>, Func<T,Boolean>)	Returns the first element in a sequence that satisfies a specified condition.
First<T>(ImmutableArray<T>)	Returns the first element in an array.
FirstOrDefault<T>(ImmutableArray<T>, Func<T,Boolean>)	Returns the first element of the sequence that satisfies a condition or a default value if no such element is found.
FirstOrDefault<T>(ImmutableArray<T>)	Returns the first element of a sequence, or a default value if the sequence contains no elements.
Last<T>(ImmutableArray<T>, Func<T,Boolean>)	Returns the last element of a sequence that satisfies a specified condition.
Last<T>(ImmutableArray<T>)	Returns the last element of the array.
LastOrDefault<T>(ImmutableArray<T>, Func<T,Boolean>)	Returns the last element of a sequence that satisfies a condition or a default value if no such element is found.
LastOrDefault<T>(ImmutableArray<T>)	Returns the last element of a sequence, or a default value if the sequence contains no elements.
Select<T,TResult>(ImmutableArray<T>, Func<T,TResult>)	Projects each element of a sequence into a new form.
SelectMany<TSource,TCollection,TResult>(ImmutableArray<TSource>, Func<TSource,IEnumerable<TCollection>>, Func<TSource,TCollection,TResult>)	Projects each element of a sequence to an IEnumerable<T>, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein.
SequenceEqual<TDerived,TBase>(ImmutableArray<TBase>, IEnumerable<TDerived>, IEqualityComparer<TBase>)	Determines whether two sequences are equal according to an equality comparer.
SequenceEqual<TDerived,TBase>(ImmutableArray<TBase>, ImmutableArray<TDerived>, IEqualityComparer<TBase>)	Determines whether two sequences are equal according to an equality comparer.
SequenceEqual<TDerived,TBase>(ImmutableArray<TBase>, ImmutableArray<TDerived>, Func<TBase,TBase,Boolean>)	Determines whether two sequences are equal according to an equality comparer.
Single<T>(ImmutableArray<T>, Func<T,Boolean>)	Returns the only element of a sequence that satisfies a specified condition, and throws an exception if more than one such element exists.
Single<T>(ImmutableArray<T>)	Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence.
SingleOrDefault<T>(ImmutableArray<T>, Func<T,Boolean>)	Returns the only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition.
SingleOrDefault<T>(ImmutableArray<T>)	Returns the only element of the array, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.
ToArray<T>(ImmutableArray<T>)	Copies the contents of this array to a mutable array.
ToDictionary<TKey,T>(ImmutableArray<T>, Func<T,TKey>, IEqualityComparer<TKey>)	Creates a dictionary based on the contents of this array.
ToDictionary<TKey,T>(ImmutableArray<T>, Func<T,TKey>)	Creates a dictionary based on the contents of this array.
ToDictionary<TKey,TElement,T>(ImmutableArray<T>, Func<T,TKey>, Func<T,TElement>, IEqualityComparer<TKey>)	Creates a dictionary based on the contents of this array.
ToDictionary<TKey,TElement,T>(ImmutableArray<T>, Func<T,TKey>, Func<T,TElement>)	Creates a dictionary based on the contents of this array.
Where<T>(ImmutableArray<T>, Func<T,Boolean>)	Filters a sequence of values based on a predicate.
AsParallel(IEnumerable)	Enables parallelization of a query.
AsParallel<TSource>(IEnumerable<TSource>)	Enables parallelization of a query.
AsQueryable(IEnumerable)	Converts an IEnumerable to an IQueryable.
AsQueryable<TElement>(IEnumerable<TElement>)	Converts a generic IEnumerable<T> to a generic IQueryable<T>.
Ancestors<T>(IEnumerable<T>, XName)	Returns a filtered collection of elements that contains the ancestors of every node in the source collection. Only elements that have a matching XName are included in the collection.
Ancestors<T>(IEnumerable<T>)	Returns a collection of elements that contains the ancestors of every node in the source collection.
DescendantNodes<T>(IEnumerable<T>)	Returns a collection of the descendant nodes of every document and element in the source collection.
Descendants<T>(IEnumerable<T>, XName)	Returns a filtered collection of elements that contains the descendant elements of every element and document in the source collection. Only elements that have a matching XName are included in the collection.
Descendants<T>(IEnumerable<T>)	Returns a collection of elements that contains the descendant elements of every element and document in the source collection.
Elements<T>(IEnumerable<T>, XName)	Returns a filtered collection of the child elements of every element and document in the source collection. Only elements that have a matching XName are included in the collection.
Elements<T>(IEnumerable<T>)	Returns a collection of the child elements of every element and document in the source collection.
InDocumentOrder<T>(IEnumerable<T>)	Returns a collection of nodes that contains all nodes in the source collection, sorted in document order.
Nodes<T>(IEnumerable<T>)	Returns a collection of the child nodes of every document and element in the source collection.
Remove<T>(IEnumerable<T>)	Removes every node in the source collection from its parent node.

Thread Safety

This type is thread safe.