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WebClient.OpenWrite Method (String, String)

Opens a stream for writing data to the specified resource, using the specified method.

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

member OpenWrite : 
        address:string * 
        method:string -> Stream

Parameters

address
Type: System.String

The URI of the resource to receive the data.

method
Type: System.String

The method used to send the data to the resource. If null, the default is POST for http and STOR for ftp.

Return Value

Type: System.IO.Stream
A Stream used to write data to the resource.

ExceptionCondition
ArgumentNullException

The address parameter is a null reference (Nothing in Visual Basic).

WebException

The URI formed by combining BaseAddress, and address is invalid.

-or-

An error occurred while opening the stream.

The OpenWrite method returns a writable stream that is used to send data to a resource. The underlying request is made with the method specified in the method parameter. The data is sent to the server when you close the stream. This method blocks while opening the stream. To continue executing while waiting for the stream, use one of the OpenWriteAsync methods.

If the method parameter specifies a method that is not understood by the server, the underlying protocol classes determine what occurs. Typically, a WebException is thrown with the Status property set to indicate the error.

If the BaseAddress property is not an empty string ("") and address does not specify an absolute address, address must be a relative URI that is combined with BaseAddress to form the absolute URI of the requested data. If the QueryString property is not an empty string, it is appended to address.

NoteNote

This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.

The following code example reads data from the command line and uses OpenWrite to obtain a stream used to write the data. Note that the Stream returned by OpenWrite must be closed to send the data.

No code example is currently available or this language may not be supported.

.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

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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