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WebClient.UploadStringAsync Method (Uri, String, String, Object)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Uploads the specified string 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 UploadStringAsync ( _
    address As Uri, _
    method As String, _
    data As String, _
    userToken As Object _
)

public void UploadStringAsync(
    Uri address,
    string method,
    string data,
    Object userToken
)

Parameters

  • address
    Type: System.Uri
    The URI of the resource to receive the file. For HTTP resources, this URI must identify a resource that can accept a request sent with the POST method, such as a script or ASP page.
  • method
    Type: System.String
    The HTTP method used to send the file to the resource. If null, the default is POST for HTTP.
  • userToken
    Type: System.Object
    A user-defined object that is passed to the method invoked when the asynchronous operation completes.

Exceptions

Exception Condition
ArgumentNullException

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

-or-

data 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.
WebException

The URI formed by combining BaseAddress and address is invalid.

-or-

There was no response from the server hosting the resource.

Remarks

This method sends a string to a resource. The string is sent asynchronously using thread resources that are automatically allocated from the thread pool. Before uploading the string, this method converts it to a Byte array using the encoding specified in the Encoding property. To receive notification when the string upload completes, you can add an event handler to the UploadStringCompleted event.

This method does not block the calling thread while the string is being sent.

Asynchronous operations that have not completed can be canceled using the CancelAsync method.

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.

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.