Streamed​File​Data​Request Streamed​File​Data​Request Streamed​File​Data​Request Class


Represents a sequential-access output stream that indicates a request for the data stream of a StorageFile that was created by calling CreateStreamedFileAsync or ReplaceWithStreamedFileAsync.

public sealed class StreamedFileDataRequest : IClosable, IStreamedFileDataRequest, IOutputStreampublic sealed class StreamedFileDataRequest : IDisposable, IStreamedFileDataRequest, IOutputStreamPublic NotInheritable Class StreamedFileDataRequest Implements IDisposable, IStreamedFileDataRequest, IOutputStream
Windows 10 requirements
Device family
Windows 10 (introduced v10.0.10240.0)
API contract
Windows.Foundation.UniversalApiContract (introduced v1)


This object is passed to the app's StreamedFileDataRequestedHandler function when a stream that is represented by a StorageFile is accessed. Define the StreamedFileDataRequestedHandler function if you use CreateStreamedFileAsync or ReplaceWithStreamedFileAsync to get a StorageFile that represents the stream.


Close() Close() Close()

Releases system resources that are exposed by the current stream indicating that the data request is complete.

public void Close()This member is not implemented in C#This member is not implemented in VB.Net

Dispose() Dispose() Dispose()

Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

This member is not implemented in C++void Dispose()Sub Dispose

FailAndClose(StreamedFileFailureMode) FailAndClose(StreamedFileFailureMode) FailAndClose(StreamedFileFailureMode)

Indicates that the data can't be streamed and releases system resources that are exposed by the current stream indicating that the data request is complete.

public void FailAndClose(StreamedFileFailureMode failureMode)public void FailAndClose(StreamedFileFailureMode failureMode)Public Function FailAndClose(failureMode As StreamedFileFailureMode) As void
StreamedFileFailureMode StreamedFileFailureMode StreamedFileFailureMode

The enum value that indicates why the data stream can't be accessed.


FlushAsync() FlushAsync() FlushAsync()

Flushes the data in the current stream.

public IAsyncOperation<bool> FlushAsync()public IAsyncOperation<bool> FlushAsync()Public Function FlushAsync() As IAsyncOperation( Of bool )

When this method completes, it returns true if the data was flushed successfully or false if the flush operation failed.


WriteAsync(IBuffer) WriteAsync(IBuffer) WriteAsync(IBuffer)

Writes data from a buffer to the current stream.

public IAsyncOperationWithProgress<uint, uint> WriteAsync(IBuffer buffer)public IAsyncOperationWithProgress<uint, uint> WriteAsync(IBuffer buffer)Public Function WriteAsync(buffer As IBuffer) As IAsyncOperationWithProgress( Of uint, uint )
IBuffer IBuffer IBuffer

The buffer that contains the data to write.


When this method completes, it returns the number of bytes (type UInt32) that were written to the stream. If the app specifies a function to monitor progress, that function receives the number of bytes (type UInt32) written so far.