Queryable.Distinct Method
Definition
Important
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Returns distinct elements from a sequence.
Overloads
| Distinct<TSource>(IQueryable<TSource>) |
Returns distinct elements from a sequence by using the default equality comparer to compare values. |
| Distinct<TSource>(IQueryable<TSource>, IEqualityComparer<TSource>) |
Returns distinct elements from a sequence by using a specified IEqualityComparer<T> to compare values. |
Distinct<TSource>(IQueryable<TSource>)
- Source:
- Queryable.cs
- Source:
- Queryable.cs
- Source:
- Queryable.cs
Returns distinct elements from a sequence by using the default equality comparer to compare values.
public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
static System::Linq::IQueryable<TSource> ^ Distinct(System::Linq::IQueryable<TSource> ^ source);public static System.Linq.IQueryable<TSource> Distinct<TSource> (this System.Linq.IQueryable<TSource> source);static member Distinct : System.Linq.IQueryable<'Source> -> System.Linq.IQueryable<'Source><Extension()>
Public Function Distinct(Of TSource) (source As IQueryable(Of TSource)) As IQueryable(Of TSource)Type Parameters
- TSource
The type of the elements of source.
Parameters
- source
- IQueryable<TSource>
The IQueryable<T> to remove duplicates from.
Returns
An IQueryable<T> that contains distinct elements from source.
Exceptions
source is null.
Examples
The following code example demonstrates how to use Distinct<TSource>(IQueryable<TSource>) to return distinct elements from a sequence.
List<int> ages = new List<int> { 21, 46, 46, 55, 17, 21, 55, 55 };
IEnumerable<int> distinctAges = ages.AsQueryable().Distinct();
Console.WriteLine("Distinct ages:");
foreach (int age in distinctAges)
Console.WriteLine(age);
/*
This code produces the following output:
Distinct ages:
21
46
55
17
*/
Dim ages As List(Of Integer) = New List(Of Integer)(New Integer() {21, 46, 46, 55, 17, 21, 55, 55})
Dim distinctAges As IEnumerable(Of Integer) = ages.AsQueryable().Distinct()
Dim output As New System.Text.StringBuilder
output.AppendLine("Distinct ages:")
For Each age As Integer In distinctAges
output.AppendLine(age)
Next
' Display the output.
MsgBox(output.ToString())
' This code produces the following output:
'
' Distinct(ages)
' 21
' 46
' 55
' 17
Remarks
The Distinct<TSource>(IQueryable<TSource>) method generates a MethodCallExpression that represents calling Distinct<TSource>(IQueryable<TSource>) itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery<TElement>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.
The query behavior that occurs as a result of executing an expression tree that represents calling Distinct<TSource>(IQueryable<TSource>) depends on the implementation of the type of the source parameter. The expected behavior is that it returns an unordered sequence of the unique items in source.
Applies to
Distinct<TSource>(IQueryable<TSource>, IEqualityComparer<TSource>)
- Source:
- Queryable.cs
- Source:
- Queryable.cs
- Source:
- Queryable.cs
Returns distinct elements from a sequence by using a specified IEqualityComparer<T> to compare values.
public:
generic <typename TSource>
[System::Runtime::CompilerServices::Extension]
static System::Linq::IQueryable<TSource> ^ Distinct(System::Linq::IQueryable<TSource> ^ source, System::Collections::Generic::IEqualityComparer<TSource> ^ comparer);public static System.Linq.IQueryable<TSource> Distinct<TSource> (this System.Linq.IQueryable<TSource> source, System.Collections.Generic.IEqualityComparer<TSource> comparer);public static System.Linq.IQueryable<TSource> Distinct<TSource> (this System.Linq.IQueryable<TSource> source, System.Collections.Generic.IEqualityComparer<TSource>? comparer);static member Distinct : System.Linq.IQueryable<'Source> * System.Collections.Generic.IEqualityComparer<'Source> -> System.Linq.IQueryable<'Source><Extension()>
Public Function Distinct(Of TSource) (source As IQueryable(Of TSource), comparer As IEqualityComparer(Of TSource)) As IQueryable(Of TSource)Type Parameters
- TSource
The type of the elements of source.
Parameters
- source
- IQueryable<TSource>
The IQueryable<T> to remove duplicates from.
- comparer
- IEqualityComparer<TSource>
An IEqualityComparer<T> to compare values.
Returns
An IQueryable<T> that contains distinct elements from source.
Exceptions
source or comparer is null.
Remarks
The Distinct<TSource>(IQueryable<TSource>, IEqualityComparer<TSource>) method generates a MethodCallExpression that represents calling Distinct<TSource>(IQueryable<TSource>, IEqualityComparer<TSource>) itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery<TElement>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.
The query behavior that occurs as a result of executing an expression tree that represents calling Distinct<TSource>(IQueryable<TSource>, IEqualityComparer<TSource>) depends on the implementation of the type of the source parameter. The expected behavior is that it returns an unordered sequence of the unique items in source by using comparer to compare values.
