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WebClient.OpenWrite Method (String)

Opens a stream for writing data to the specified resource.

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

member OpenWrite : 
        address:string -> Stream 

Parameters

address
Type: System.String
The URI of the resource to receive the data.

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. This method blocks while opening the stream. To continue executing while waiting for the stream, use one of the OpenWriteAsync methods.

If the BaseAddress property is not an empty string ("") and address does not contain an absolute URI, 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.

This method uses the STOR command to upload an FTP resource. For an HTTP resource, the POST method is used.

NoteNote

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

The following code example reads data from the command line and uses OpenWrite to obtain a stream for writing the data. Note that the Stream returned by OpenWrite is closed after the data is sent.

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

.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

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.

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