Article
11/18/2011

FileStream.BeginWrite Method

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Begins an asynchronous write.

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

Syntax

'Declaration
<SecuritySafeCriticalAttribute> _
Public Overrides Function BeginWrite ( _
    array As Byte(), _
    offset As Integer, _
    numBytes As Integer, _
    userCallback As AsyncCallback, _
    stateObject As Object _
) As IAsyncResult

[SecuritySafeCriticalAttribute]
public override IAsyncResult BeginWrite(
    byte[] array,
    int offset,
    int numBytes,
    AsyncCallback userCallback,
    Object stateObject
)

Parameters

array
Type: array<System.Byte[]
The buffer containing data to write to the current stream.

offset
Type: System.Int32
The zero-based byte offset in array at which to begin copying bytes to the current stream.

numBytes
Type: System.Int32
The maximum number of bytes to write.

userCallback
Type: System.AsyncCallback
The method to be called when the asynchronous write operation is completed.

stateObject
Type: System.Object
A user-provided object that distinguishes this particular asynchronous write request from other requests.

Return Value

Type: System.IAsyncResult
An IAsyncResult that references the asynchronous write.

Exceptions

Exception	Condition
ArgumentException	array length minus offset is less than numBytes.
ArgumentNullException	array is nulla null reference (Nothing in Visual Basic).
ArgumentOutOfRangeException	offset or numBytes is negative.
NotSupportedException	The stream does not support writing.
ObjectDisposedException	The stream is closed.
IOException	An I/O error occurs.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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