System..::.Object
  System.Collections.Specialized..::.NameObjectCollectionBase
    System.Collections.Specialized..::.NameValueCollection
      System.Net..::.WebHeaderCollection

Visual Basic

<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public Class WebHeaderCollection _
    Inherits NameValueCollection _
    Implements ISerializable

C#

[SerializableAttribute]
[ComVisibleAttribute(true)]
public class WebHeaderCollection : NameValueCollection, 
    ISerializable

Visual C++

[SerializableAttribute]
[ComVisibleAttribute(true)]
public ref class WebHeaderCollection : public NameValueCollection, 
    ISerializable

F#

[<SerializableAttribute>]
[<ComVisibleAttribute(true)>]
type WebHeaderCollection =  
    class
        inherit NameValueCollection
        interface ISerializable
    end

	Name	Description
	WebHeaderCollection()()()	Initializes a new instance of the WebHeaderCollection class.
	WebHeaderCollection(SerializationInfo, StreamingContext)	Initializes a new instance of the WebHeaderCollection class from the specified instances of the SerializationInfo and StreamingContext classes.

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	Name	Description
	AllKeys	Gets all header names (keys) in the collection. (Overrides NameValueCollection..::.AllKeys.)
	Count	Gets the number of headers in the collection. (Overrides NameObjectCollectionBase..::.Count.)
	IsReadOnly	Gets or sets a value indicating whether the NameObjectCollectionBase instance is read-only. (Inherited from NameObjectCollectionBase.)
	Item[([(HttpRequestHeader])])	Gets or sets the specified request header.
	Item[([(HttpResponseHeader])])	Gets or sets the specified response header.
	Item[([(Int32])])	Gets the entry at the specified index of the NameValueCollection. (Inherited from NameValueCollection.)
	Item[([(String])])	Gets or sets the entry with the specified key in the NameValueCollection. (Inherited from NameValueCollection.)
	Keys	Gets the collection of header names (keys) in the collection. (Overrides NameObjectCollectionBase..::.Keys.)

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	Name	Description
	Add(NameValueCollection)	Copies the entries in the specified NameValueCollection to the current NameValueCollection. (Inherited from NameValueCollection.)
	Add(String)	Inserts the specified header into the collection.
	Add(HttpRequestHeader, String)	Inserts the specified header with the specified value into the collection.
	Add(HttpResponseHeader, String)	Inserts the specified header with the specified value into the collection.
	Add(String, String)	Inserts a header with the specified name and value into the collection. (Overrides NameValueCollection..::.Add(String, String).)
	AddWithoutValidate	Inserts a header into the collection without checking whether the header is on the restricted header list.
	BaseAdd	Adds an entry with the specified key and value into the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
	BaseClear	Removes all entries from the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
	BaseGet(Int32)	Gets the value of the entry at the specified index of the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
	BaseGet(String)	Gets the value of the first entry with the specified key from the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
	BaseGetAllKeys	Returns a String array that contains all the keys in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
	BaseGetAllValues()()()	Returns an Object array that contains all the values in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
	BaseGetAllValues(Type)	Returns an array of the specified type that contains all the values in the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
	BaseGetKey	Gets the key of the entry at the specified index of the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
	BaseHasKeys	Gets a value indicating whether the NameObjectCollectionBase instance contains entries whose keys are not nullNothingnullptra null reference (Nothing in Visual Basic). (Inherited from NameObjectCollectionBase.)
	BaseRemove	Removes the entries with the specified key from the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
	BaseRemoveAt	Removes the entry at the specified index of the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
	BaseSet(Int32, Object)	Sets the value of the entry at the specified index of the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
	BaseSet(String, Object)	Sets the value of the first entry with the specified key in the NameObjectCollectionBase instance, if found; otherwise, adds an entry with the specified key and value into the NameObjectCollectionBase instance. (Inherited from NameObjectCollectionBase.)
	Clear	Removes all headers from the collection. (Overrides NameValueCollection..::.Clear()()().)
	CopyTo	Copies the entire NameValueCollection to a compatible one-dimensional Array, starting at the specified index of the target array. (Inherited from NameValueCollection.)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	Get(Int32)	Get the value of a particular header in the collection, specified by an index into the collection. (Overrides NameValueCollection..::.Get(Int32).)
	Get(String)	Get the value of a particular header in the collection, specified by the name of the header. (Overrides NameValueCollection..::.Get(String).)
	GetEnumerator	Returns an enumerator that can iterate through the WebHeaderCollection instance. (Overrides NameObjectCollectionBase..::.GetEnumerator()()().)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetKey	Get the header name at the specified position in the collection. (Overrides NameValueCollection..::.GetKey(Int32).)
	GetObjectData	Infrastructure. Populates a SerializationInfo with the data needed to serialize the target object. (Overrides NameObjectCollectionBase..::.GetObjectData(SerializationInfo, StreamingContext).)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetValues(Int32)	Gets an array of header values stored in the index position of the header collection. (Overrides NameValueCollection..::.GetValues(Int32).)
	GetValues(String)	Gets an array of header values stored in a header. (Overrides NameValueCollection..::.GetValues(String).)
	HasKeys	Gets a value indicating whether the NameValueCollection contains keys that are not nullNothingnullptra null reference (Nothing in Visual Basic). (Inherited from NameValueCollection.)
	InvalidateCachedArrays	Resets the cached arrays of the collection to nullNothingnullptra null reference (Nothing in Visual Basic). (Inherited from NameValueCollection.)
	IsRestricted(String)	Tests whether the specified HTTP header can be set for the request.
	IsRestricted(String, Boolean)	Tests whether the specified HTTP header can be set for the request or the response.
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	OnDeserialization	Implements the ISerializable interface and raises the deserialization event when the deserialization is complete. (Overrides NameObjectCollectionBase..::.OnDeserialization(Object).)
	Remove(HttpRequestHeader)	Removes the specified header from the collection.
	Remove(HttpResponseHeader)	Removes the specified header from the collection.
	Remove(String)	Removes the specified header from the collection. (Overrides NameValueCollection..::.Remove(String).)
	Set(HttpRequestHeader, String)	Sets the specified header to the specified value.
	Set(HttpResponseHeader, String)	Sets the specified header to the specified value.
	Set(String, String)	Sets the specified header to the specified value. (Overrides NameValueCollection..::.Set(String, String).)
	ToByteArray	Infrastructure. Converts the WebHeaderCollection to a byte array..
	ToString	Infrastructure. This method is obsolete. (Overrides Object..::.ToString()()().)

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	Name	Description
	ICollection..::.CopyTo	Copies the entire NameObjectCollectionBase to a compatible one-dimensional Array, starting at the specified index of the target array. (Inherited from NameObjectCollectionBase.)
	ICollection..::.IsSynchronized	Gets a value indicating whether access to the NameObjectCollectionBase object is synchronized (thread safe). (Inherited from NameObjectCollectionBase.)
	ICollection..::.SyncRoot	Gets an object that can be used to synchronize access to the NameObjectCollectionBase object. (Inherited from NameObjectCollectionBase.)
	ISerializable..::.GetObjectData	Infrastructure. Serializes this instance into the specified SerializationInfo object.

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The WebHeaderCollection class is generally accessed through WebRequest..::.Headers or WebResponse..::.Headers. Some common headers are considered restricted and are either exposed directly by the API (such as Content-Type) or protected by the system and cannot be changed.

The restricted headers are:

• Accept

• Connection

• Content-Length

• Content-Type

• Date

• Expect

• Host

• If-Modified-Since

• Range

• Referer

• Transfer-Encoding

• User-Agent

• Proxy-Connection

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Reference