BeginWrite Method

GZipStream.BeginWrite Method (Byte[], Int32, Int32, AsyncCallback, Object)


Begins an asynchronous write operation. (Consider using the Stream.WriteAsync method instead; see the Remarks section.)

Namespace:   System.IO.Compression
Assembly:  System (in System.dll)

[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public override IAsyncResult BeginWrite(
	byte[] array,
	int offset,
	int count,
	AsyncCallback asyncCallback,
	object asyncState


Type: System.Byte[]

The buffer containing data to write to the current stream.

Type: System.Int32

The byte offset in array at which to begin writing.

Type: System.Int32

The maximum number of bytes to write.

Type: System.AsyncCallback

An optional asynchronous callback to be called when the write operation is complete.

Type: System.Object

A user-provided object that distinguishes this particular asynchronous write request from other requests.

Return Value

Type: System.IAsyncResult

An object that represents the asynchronous write operation, which could still be pending.

Exception Condition

The underlying stream is null.


The underlying stream is closed.

Starting with the .NET Framework 4.5, you can perform asynchronous write operations by using the Stream.WriteAsync method. The BeginWrite method is still available in .NET Framework 4.5 to support legacy code; however, you can implement asynchronous I/O operations more easily by using the new async methods. For more information, see .

The BeginWrite method starts an asynchronous write operation to a GZipStream stream object.

You must create a callback method that implements the AsyncCallback delegate and pass its name to the BeginWrite method.

.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Return to top
© 2015 Microsoft