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

 
System_CAPS_noteNote

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Begins an asynchronous write.

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

[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public override IAsyncResult BeginWrite(
	byte[] buffer,
	int offset,
	int numBytes,
	AsyncCallback userCallback,
	object stateObject
)

Parameters

buffer
Type: System.Byte[]

The buffer to write data to.

offset
Type: System.Int32

The byte offset in buffer at which to begin writing.

numBytes
Type: System.Int32

The maximum number of bytes to write.

userCallback
Type: System.AsyncCallback

The method to call when the asynchronous write operation is completed. This parameter is optional.

stateObject
Type: System.Object

The status of the asynchronous write.

Return Value

Type: System.IAsyncResult

An IAsyncResult that represents the asynchronous write, which is possibly still pending. This IAsyncResult must be passed to this stream's EndWrite method to ensure that the write is complete, then frees resources appropriately. This can be done either by the same code that called BeginWrite or in a callback passed to BeginWrite.

Exception Condition
IOException

An asynchronous write was attempted past the end of the file.

If a IsolatedStorageFileStream object is writable, writing at the end of the stream expands the stream.

The current position in the stream is updated when you issue the asynchronous read or write, not when the I/O operation completes.

You must call EndWrite with the IAsyncResult object that this method returns to find out how many bytes were written.

.NET Framework
Available since 1.1
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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