WebClient.OpenWriteAsync Method (Uri)
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Opens a stream for writing data to the specified resource. This method does not block the calling thread.
Namespace: System.Net
Assembly: System.Net (in System.Net.dll)
Syntax
'Declaration
Public Sub OpenWriteAsync ( _
address As Uri _
)
public void OpenWriteAsync(
Uri address
)
Parameters
- address
Type: System.Uri
The URI of the resource to receive the data.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | The address parameter is nulla null reference (Nothing in Visual Basic). |
| OutOfMemoryException | There is not enough memory to continue the execution of the program. |
| StackOverflowException | The execution stack overflowed because it contains too many nested method calls. |
| ThreadAbortException | A call was made to the Thread.Abort method to destroy a thread. |
Remarks
This method retrieves a writable stream that is used to send data to a resource. The stream is retrieved using thread resources that are automatically allocated from the thread pool. To receive notification when the stream is available, add an event handler to the OpenWriteCompleted event. When you close the stream, the thread blocks until the request is sent to address and a response is received.
This method does not block the calling thread while the stream is being opened.
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.
This method uses the POST command to upload an HTTP resource.
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.