System.IO.Stream.WriteAsync Method

Asynchronously writes a sequence of bytes to the current stream and advances the current position within this stream by the number of bytes written.


public System.Threading.Tasks.Task WriteAsync (byte[] buffer, int offset, int count)


The buffer to write data from.
The zero-based byte offset in buffer from which to begin copying bytes to the stream.
The maximum number of bytes to write.


A task that represents the asynchronous write operation.


The Stream.WriteAsync(Byte[], int, int) method enables you to perform resource-intensive I/O operations without blocking the main thread. This performance consideration is particularly important in a win8_appname_long app or desktop_appname app where a time-consuming stream operation can block the UI thread and make your app appear as if it is not working. The async methods are used in conjunction with the async and await keywords in Visual Basic and C#.

Use the Stream.CanWrite property to determine whether the current instance supports writing.


Namespace: System.IO
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: