NameValueCollection Constructors

Definition

Namespace:

System.Collections.Specialized

Assembly:

System.Collections.Specialized.dll

Initializes a new instance of the NameValueCollection class.

Overloads

NameValueCollection()	Initializes a new instance of the NameValueCollection class that is empty, has the default initial capacity and uses the default case-insensitive hash code provider and the default case-insensitive comparer.
NameValueCollection(IEqualityComparer)	Initializes a new instance of the NameValueCollection class that is empty, has the default initial capacity, and uses the specified IEqualityComparer object.
NameValueCollection(NameValueCollection)	Copies the entries from the specified NameValueCollection to a new NameValueCollection with the same initial capacity as the number of entries copied and using the same hash code provider and the same comparer as the source collection.
NameValueCollection(Int32)	Initializes a new instance of the NameValueCollection class that is empty, has the specified initial capacity and uses the default case-insensitive hash code provider and the default case-insensitive comparer.
NameValueCollection(IHashCodeProvider, IComparer)	Obsolete. Initializes a new instance of the NameValueCollection class that is empty, has the default initial capacity and uses the specified hash code provider and the specified comparer.
NameValueCollection(Int32, IEqualityComparer)	Initializes a new instance of the NameValueCollection class that is empty, has the specified initial capacity, and uses the specified IEqualityComparer object.
NameValueCollection(Int32, NameValueCollection)	Copies the entries from the specified NameValueCollection to a new NameValueCollection with the specified initial capacity or the same initial capacity as the number of entries copied, whichever is greater, and using the default case-insensitive hash code provider and the default case-insensitive comparer.
NameValueCollection(SerializationInfo, StreamingContext)	Obsolete. Initializes a new instance of the NameValueCollection class that is serializable and uses the specified SerializationInfo and StreamingContext.
NameValueCollection(Int32, IHashCodeProvider, IComparer)	Obsolete. Initializes a new instance of the NameValueCollection class that is empty, has the specified initial capacity and uses the specified hash code provider and the specified comparer.

NameValueCollection()

Source:

NameValueCollection.cs

Initializes a new instance of the NameValueCollection class that is empty, has the default initial capacity and uses the default case-insensitive hash code provider and the default case-insensitive comparer.

public:
 NameValueCollection();

public NameValueCollection ();

Public Sub New ()

Remarks

The capacity of a NameValueCollection is the number of elements that the NameValueCollection can hold. As elements are added to a NameValueCollection, the capacity is automatically increased as required by reallocating the internal array.

If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the NameValueCollection.

The hash code provider dispenses hash codes for keys in the NameValueCollection. The default hash code provider is the CaseInsensitiveHashCodeProvider.

The comparer determines whether two keys are equal. The default comparer is the CaseInsensitiveComparer.

This constructor is an O(1) operation.

See also

• CaseInsensitiveHashCodeProvider
• CaseInsensitiveComparer
• Performing Culture-Insensitive String Operations

NameValueCollection(IEqualityComparer)

Source:

NameValueCollection.cs

Initializes a new instance of the NameValueCollection class that is empty, has the default initial capacity, and uses the specified IEqualityComparer object.

public:
 NameValueCollection(System::Collections::IEqualityComparer ^ equalityComparer);

public NameValueCollection (System.Collections.IEqualityComparer? equalityComparer);

new System.Collections.Specialized.NameValueCollection : System.Collections.IEqualityComparer -> System.Collections.Specialized.NameValueCollection

Public Sub New (equalityComparer As IEqualityComparer)

Parameters

equalityComparer

IEqualityComparer

The IEqualityComparer object to use to determine whether two keys are equal and to generate hash codes for the keys in the collection.

Remarks

The capacity of a NameValueCollection object is the number of elements that the NameValueCollection can hold. As elements are added to a NameValueCollection, the capacity is automatically increased as required by reallocating the internal array.

If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the NameValueCollection.

The IEqualityComparer object combines the comparer and the hash code provider. The hash code provider dispenses hash codes for keys in the NameValueCollection. The comparer determines whether two keys are equal.

This constructor is an O(1) operation.

See also

• IEqualityComparer
• Performing Culture-Insensitive String Operations

NameValueCollection(NameValueCollection)

Source:

NameValueCollection.cs

Copies the entries from the specified NameValueCollection to a new NameValueCollection with the same initial capacity as the number of entries copied and using the same hash code provider and the same comparer as the source collection.

public:
 NameValueCollection(System::Collections::Specialized::NameValueCollection ^ col);

public NameValueCollection (System.Collections.Specialized.NameValueCollection col);

new System.Collections.Specialized.NameValueCollection : System.Collections.Specialized.NameValueCollection -> System.Collections.Specialized.NameValueCollection

Public Sub New (col As NameValueCollection)

Parameters

col

NameValueCollection

The NameValueCollection to copy to the new NameValueCollection instance.

Exceptions

ArgumentNullException

col is null.

Remarks

The capacity of a NameValueCollection is the number of elements that the NameValueCollection can hold. As elements are added to a NameValueCollection, the capacity is automatically increased as required by reallocating the internal array.

If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the NameValueCollection.

The hash code provider dispenses hash codes for keys in the NameValueCollection. The default hash code provider is the CaseInsensitiveHashCodeProvider.

The comparer determines whether two keys are equal. The default comparer is the CaseInsensitiveComparer.

The elements of the new NameValueCollection are sorted in the same order as the source NameValueCollection.

This constructor is an O(n) operation, where n is the number of elements in col.

See also

• CaseInsensitiveHashCodeProvider
• CaseInsensitiveComparer
• Performing Culture-Insensitive String Operations

NameValueCollection(Int32)

Source:

NameValueCollection.cs

Initializes a new instance of the NameValueCollection class that is empty, has the specified initial capacity and uses the default case-insensitive hash code provider and the default case-insensitive comparer.

public:
 NameValueCollection(int capacity);

public NameValueCollection (int capacity);

new System.Collections.Specialized.NameValueCollection : int -> System.Collections.Specialized.NameValueCollection

Public Sub New (capacity As Integer)

Parameters

capacity

Int32

The initial number of entries that the NameValueCollection can contain.

Exceptions

ArgumentOutOfRangeException

capacity is less than zero.

Remarks

The capacity of a NameValueCollection is the number of elements that the NameValueCollection can hold. As elements are added to a NameValueCollection, the capacity is automatically increased as required by reallocating the internal array.

If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the NameValueCollection.

The hash code provider dispenses hash codes for keys in the NameValueCollection. The default hash code provider is the CaseInsensitiveHashCodeProvider.

The comparer determines whether two keys are equal. The default comparer is the CaseInsensitiveComparer.

This constructor is an O(n) operation, where n is capacity.

See also

• CaseInsensitiveHashCodeProvider
• CaseInsensitiveComparer
• Performing Culture-Insensitive String Operations

NameValueCollection(IHashCodeProvider, IComparer)

Source:

NameValueCollection.cs

Caution

This constructor has been deprecated. Use NameValueCollection(IEqualityComparer) instead.

Initializes a new instance of the NameValueCollection class that is empty, has the default initial capacity and uses the specified hash code provider and the specified comparer.

public:
 NameValueCollection(System::Collections::IHashCodeProvider ^ hashProvider, System::Collections::IComparer ^ comparer);

[System.Obsolete("This constructor has been deprecated. Use NameValueCollection(IEqualityComparer) instead.")]
public NameValueCollection (System.Collections.IHashCodeProvider? hashProvider, System.Collections.IComparer? comparer);

[<System.Obsolete("This constructor has been deprecated. Use NameValueCollection(IEqualityComparer) instead.")>]
new System.Collections.Specialized.NameValueCollection : System.Collections.IHashCodeProvider * System.Collections.IComparer -> System.Collections.Specialized.NameValueCollection

Public Sub New (hashProvider As IHashCodeProvider, comparer As IComparer)

Parameters

hashProvider

IHashCodeProvider

The IHashCodeProvider that will supply the hash codes for all keys in the NameValueCollection.

comparer

IComparer

The IComparer to use to determine whether two keys are equal.

Attributes

ObsoleteAttribute

Remarks

The capacity of a NameValueCollection is the number of elements that the NameValueCollection can hold. As elements are added to a NameValueCollection, the capacity is automatically increased as required by reallocating the internal array.

If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the NameValueCollection.

The hash code provider dispenses hash codes for keys in the NameValueCollection. The default hash code provider is the CaseInsensitiveHashCodeProvider.

The comparer determines whether two keys are equal. The default comparer is the CaseInsensitiveComparer.

This constructor is an O(1) operation.

See also

• IHashCodeProvider
• CaseInsensitiveHashCodeProvider
• IComparer
• CaseInsensitiveComparer
• Performing Culture-Insensitive String Operations

NameValueCollection(Int32, IEqualityComparer)

Source:

NameValueCollection.cs

Initializes a new instance of the NameValueCollection class that is empty, has the specified initial capacity, and uses the specified IEqualityComparer object.

public:
 NameValueCollection(int capacity, System::Collections::IEqualityComparer ^ equalityComparer);

public NameValueCollection (int capacity, System.Collections.IEqualityComparer? equalityComparer);

new System.Collections.Specialized.NameValueCollection : int * System.Collections.IEqualityComparer -> System.Collections.Specialized.NameValueCollection

Public Sub New (capacity As Integer, equalityComparer As IEqualityComparer)

Parameters

capacity

Int32

The initial number of entries that the NameValueCollection object can contain.

equalityComparer

IEqualityComparer

The IEqualityComparer object to use to determine whether two keys are equal and to generate hash codes for the keys in the collection.

Exceptions

ArgumentOutOfRangeException

capacity is less than zero.

Remarks

The capacity of a NameValueCollection object is the number of elements that the NameValueCollection can hold. As elements are added to a NameValueCollection, the capacity is automatically increased as required by reallocating the internal array.

If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the NameValueCollection.

The IEqualityComparer object combines the comparer and the hash code provider. The hash code provider dispenses hash codes for keys in the NameValueCollection. The comparer determines whether two keys are equal.

This constructor is an O(n) operation, where n is the capacity parameter.

See also

• IEqualityComparer
• Performing Culture-Insensitive String Operations

NameValueCollection(Int32, NameValueCollection)

Source:

NameValueCollection.cs

Copies the entries from the specified NameValueCollection to a new NameValueCollection with the specified initial capacity or the same initial capacity as the number of entries copied, whichever is greater, and using the default case-insensitive hash code provider and the default case-insensitive comparer.

public:
 NameValueCollection(int capacity, System::Collections::Specialized::NameValueCollection ^ col);

public NameValueCollection (int capacity, System.Collections.Specialized.NameValueCollection col);

new System.Collections.Specialized.NameValueCollection : int * System.Collections.Specialized.NameValueCollection -> System.Collections.Specialized.NameValueCollection

Public Sub New (capacity As Integer, col As NameValueCollection)

Parameters

capacity

Int32

The initial number of entries that the NameValueCollection can contain.

col

NameValueCollection

The NameValueCollection to copy to the new NameValueCollection instance.

Exceptions

ArgumentOutOfRangeException

capacity is less than zero.

ArgumentNullException

col is null.

Remarks

The capacity of a NameValueCollection is the number of elements that the NameValueCollection can hold. As elements are added to a NameValueCollection, the capacity is automatically increased as required by reallocating the internal array.

If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the NameValueCollection.

The hash code provider dispenses hash codes for keys in the NameValueCollection. The default hash code provider is the CaseInsensitiveHashCodeProvider.

The comparer determines whether two keys are equal. The default comparer is the CaseInsensitiveComparer.

This constructor is an O(n) operation, where n is capacity. If the number of elements in col is greater than capacity, this constructor becomes an O(n + m) operation, where n is capacity and m is the number of elements in col.

See also

• CaseInsensitiveHashCodeProvider
• CaseInsensitiveComparer
• Performing Culture-Insensitive String Operations

NameValueCollection(SerializationInfo, StreamingContext)

Source:

NameValueCollection.cs

Caution

This API supports obsolete formatter-based serialization. It should not be called or extended by application code.

Initializes a new instance of the NameValueCollection class that is serializable and uses the specified SerializationInfo and StreamingContext.

protected:
 NameValueCollection(System::Runtime::Serialization::SerializationInfo ^ info, System::Runtime::Serialization::StreamingContext context);

[System.Obsolete("This API supports obsolete formatter-based serialization. It should not be called or extended by application code.", DiagnosticId="SYSLIB0051", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
protected NameValueCollection (System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context);

[<System.Obsolete("This API supports obsolete formatter-based serialization. It should not be called or extended by application code.", DiagnosticId="SYSLIB0051", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
new System.Collections.Specialized.NameValueCollection : System.Runtime.Serialization.SerializationInfo * System.Runtime.Serialization.StreamingContext -> System.Collections.Specialized.NameValueCollection

Protected Sub New (info As SerializationInfo, context As StreamingContext)

Parameters

info

SerializationInfo

A SerializationInfo object that contains the information required to serialize the new NameValueCollection instance.

context

StreamingContext

A StreamingContext object that contains the source and destination of the serialized stream associated with the new NameValueCollection instance.

Attributes

ObsoleteAttribute

Remarks

This constructor is an O(1) operation.

See also

• ISerializable
• SerializationInfo
• StreamingContext
• Performing Culture-Insensitive String Operations

NameValueCollection(Int32, IHashCodeProvider, IComparer)

Source:

NameValueCollection.cs

Caution

This constructor has been deprecated. Use NameValueCollection(Int32, IEqualityComparer) instead.

Initializes a new instance of the NameValueCollection class that is empty, has the specified initial capacity and uses the specified hash code provider and the specified comparer.

public:
 NameValueCollection(int capacity, System::Collections::IHashCodeProvider ^ hashProvider, System::Collections::IComparer ^ comparer);

[System.Obsolete("This constructor has been deprecated. Use NameValueCollection(Int32, IEqualityComparer) instead.")]
public NameValueCollection (int capacity, System.Collections.IHashCodeProvider? hashProvider, System.Collections.IComparer? comparer);

[<System.Obsolete("This constructor has been deprecated. Use NameValueCollection(Int32, IEqualityComparer) instead.")>]
new System.Collections.Specialized.NameValueCollection : int * System.Collections.IHashCodeProvider * System.Collections.IComparer -> System.Collections.Specialized.NameValueCollection

Public Sub New (capacity As Integer, hashProvider As IHashCodeProvider, comparer As IComparer)

Parameters

capacity

Int32

The initial number of entries that the NameValueCollection can contain.

hashProvider

IHashCodeProvider

The IHashCodeProvider that will supply the hash codes for all keys in the NameValueCollection.

comparer

IComparer

The IComparer to use to determine whether two keys are equal.

Attributes

ObsoleteAttribute

Exceptions

ArgumentOutOfRangeException

capacity is less than zero.

Remarks

The capacity of a NameValueCollection is the number of elements that the NameValueCollection can hold. As elements are added to a NameValueCollection, the capacity is automatically increased as required by reallocating the internal array.

If the size of the collection can be estimated, specifying the initial capacity eliminates the need to perform a number of resizing operations while adding elements to the NameValueCollection.

The hash code provider dispenses hash codes for keys in the NameValueCollection. The default hash code provider is the CaseInsensitiveHashCodeProvider.

The comparer determines whether two keys are equal. The default comparer is the CaseInsensitiveComparer.

This constructor is an O(n) operation, where n is capacity.

See also

• CaseInsensitiveHashCodeProvider
• CaseInsensitiveComparer
• Performing Culture-Insensitive String Operations