MemoryStream.WriteAsync Method (Byte[], Int32, Int32, CancellationToken)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Asynchronously writes a sequence of bytes to the current stream, advances the current position within this stream by the number of bytes written, and monitors cancellation requests.
Assembly: mscorlib (in mscorlib.dll)
public override Task WriteAsync( byte[] buffer, int offset, int count, CancellationToken cancellationToken )
Parameters
- buffer
- Type:
System.Byte
[]
The buffer to write data from.
- offset
- Type: System.Int32
The zero-based byte offset in buffer from which to begin copying bytes to the stream.
- count
- Type: System.Int32
The maximum number of bytes to write.
- cancellationToken
- Type: System.Threading.CancellationToken
The token to monitor for cancellation requests. The default value is None.
Return Value
Type: System.Threading.Tasks.TaskA task that represents the asynchronous write operation.
| Exception | Condition |
|---|---|
| ArgumentNullException | buffer is null. |
| ArgumentOutOfRangeException | offset or count is negative. |
| ArgumentException | The sum of offset and count is larger than the buffer length. |
| NotSupportedException | The stream does not support writing. |
| ObjectDisposedException | The stream has been disposed. |
| InvalidOperationException | The stream is currently in use by a previous write operation. |
If the operation is canceled before it completes, the returned task contains the Canceled value for the Status property.
You can create a cancellation token by creating an instance of the CancellationTokenSource class and passing the Token property as the cancellationToken parameter.