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WebRequest.RegisterPrefix Method

Registers a WebRequest descendant for the specified URI.

Namespace:  System.Net
Assembly:  System (in System.dll)

'Declaration
Public Shared Function RegisterPrefix ( _
	prefix As String, _
	creator As IWebRequestCreate _
) As Boolean

Parameters

prefix
Type: System.String

The complete URI or URI prefix that the WebRequest descendant services.

creator
Type: System.Net.IWebRequestCreate

The create method that the WebRequest calls to create the WebRequest descendant.

Return Value

Type: System.Boolean
true if registration is successful; otherwise, false.

ExceptionCondition
ArgumentNullException

prefix is Nothing

-or-

creator is Nothing.

The RegisterPrefix method registers WebRequest descendants to service requests. WebRequest descendants are typically registered to handle a specific protocol, such HTTP or FTP, but can be registered to handle a request to a specific server or path on a server.

The pre-registered reserve types already registered include the following:

  • http://

  • https://

  • ftp://

  • file://

For more information, see the Create(String) and Create(Uri) methods.

Duplicate prefixes are not allowed. RegisterPrefix returns false if an attempt is made to register a duplicate prefix.

NoteNote

The HttpWebRequest class is registered to service requests for HTTP and HTTPS schemes by default. Attempts to register a different WebRequest descendant for these schemes will fail.

.NET Framework

Supported in: 4.5, 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

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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