BufferedStream.BeginWrite(Byte[], Int32, Int32, AsyncCallback, Object) Method (System.IO) (original) (raw)

Reference

Definition

public:
 override IAsyncResult ^ BeginWrite(cli::array <System::Byte> ^ buffer, int offset, int count, AsyncCallback ^ callback, System::Object ^ state);

public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback? callback, object? state);

public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state);

public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object? state);

override this.BeginWrite : byte[] * int * int * AsyncCallback * obj -> IAsyncResult

Public Overrides Function BeginWrite (buffer As Byte(), offset As Integer, count As Integer, callback As AsyncCallback, state As Object) As IAsyncResult

Parameters

buffer

Byte[]

The buffer containing data to write to the current stream.

offset

Int32

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

count

Int32

The maximum number of bytes to write.

callback

AsyncCallback

The method to be called when the asynchronous write operation is completed.

state

Object

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

Returns

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

Exceptions

buffer length minus offset is less than count.

offset or count is negative.

The stream does not support writing.

Remarks

In the .NET Framework 4 and earlier versions, you have to use methods such as BeginWrite and EndWrite to implement asynchronous file operations. These methods are still available in the .NET Framework 4.5 to support legacy code; however, the new async methods, such as ReadAsync, WriteAsync, and FlushAsync, help you implement asynchronous file operations more easily.