MemoryStream.WriteAsync Method

Definition

Namespace:

System.IO

Assemblies:

netstandard.dll, System.Runtime.dll

Overloads

WriteAsync(ReadOnlyMemory<Byte>, CancellationToken)	Asynchronously writes the sequence of bytes contained in source into the current memory stream, advances the current position within this memory stream by the number of bytes written, and monitors cancellation requests.
WriteAsync(Byte[], Int32, Int32, CancellationToken)	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.

WriteAsync(ReadOnlyMemory<Byte>, CancellationToken)

Source:

MemoryStream.cs

Asynchronously writes the sequence of bytes contained in source into the current memory stream, advances the current position within this memory stream by the number of bytes written, and monitors cancellation requests.

C#

public override System.Threading.Tasks.ValueTask WriteAsync(ReadOnlyMemory<byte> buffer, System.Threading.CancellationToken cancellationToken = default);

Parameters

buffer

ReadOnlyMemory<Byte>

The region of memory to write data from.

cancellationToken

CancellationToken

The token to monitor for cancellation requests. The default value is None.

Returns

ValueTask

A task that represents the asynchronous write operation.

Exceptions

OperationCanceledException

The cancellation token was canceled. This exception is stored into the returned task.

WriteAsync(Byte[], Int32, Int32, CancellationToken)

Source:

MemoryStream.cs

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.

C#

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

Parameters

buffer

Byte[]

The buffer to write data from.

offset

Int32

The zero-based byte offset in buffer from which to begin copying bytes to the stream.

count

Int32

The maximum number of bytes to write.

cancellationToken

CancellationToken

The token to monitor for cancellation requests. The default value is None.

Returns

Task

A task that represents the asynchronous write operation.

Exceptions

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.

OperationCanceledException

The cancellation token was canceled. This exception is stored into the returned task.

Remarks

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.

This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as ArgumentException, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by Write(Byte[], Int32, Int32).