CryptoStream::WriteAsync Method (array<Byte>^, Int32, Int32, CancellationToken)
Writes a sequence of bytes to the current stream asynchronously, advances the current position within the stream by the number of bytes written, and monitors cancellation requests.
Assembly: mscorlib (in mscorlib.dll)
public: virtual Task^ WriteAsync( array<unsigned char>^ buffer, int offset, int count, CancellationToken cancellationToken ) override
Parameters
- buffer
-
Type:
array<System::Byte>^
The buffer to write data from.
- offset
-
Type:
System::Int32
The zero-based byte offset in buffer from which to begin writing 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::Task^A 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. |
You must preface your call to WriteAsync with the await (C#) or Await (Visual Basic) operator to suspend execution of the method until the task is complete. For more information, see Asynchronous Programming with Async and Await (C# and Visual Basic).
If the operation is canceled before it completes, the returned task contains the Canceled value for the Status property.
Available since 4.5