WebClient.OpenReadAsync Method (Uri)

July 28, 2014

Opens a readable stream to the specified resource.

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

public void OpenReadAsync(
	Uri address
)

Parameters

address
Type: System.Uri
The location of the resource to be downloaded.

ExceptionCondition
ArgumentNullException

The address parameter is null.

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.

This method retrieves the specified resource using the GET method. The resource is downloaded asynchronously. If the AllowReadStreamBuffering property is true, then the OpenReadCompleted event is raised once the entire response stream has been received and buffered into memory. Otherwise, the OpenReadCompleted event is raised as soon as the response stream is available for reading even if all data has not yet arrived.

You can use the CancelAsync method to cancel asynchronous operations that have not completed.

You cannot call the OpenReadAsync method again on the same WebClient object, until the first download operation is completed. Doing this causes an exception.

If the BaseAddress property is not an empty string and the address does not contain an absolute URI, the address must be a relative URI that is combined with BaseAddress to form the absolute URI of the requested data.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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