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

 

Begins an asynchronous read.

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

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

Parameters

buffer
Type: System.Byte[]

The buffer to read data into.

offset
Type: System.Int32

The byte offset in buffer at which to begin reading.

numBytes
Type: System.Int32

The maximum number of bytes to read.

userCallback
Type: System.AsyncCallback

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

stateObject
Type: System.Object

The status of the asynchronous read.

Return Value

Type: System.IAsyncResult

An IAsyncResult object that represents the asynchronous read, which is possibly still pending. This IAsyncResult must be passed to this stream's EndRead method to determine how many bytes were read. This can be done either by the same code that called BeginRead or in a callback passed to BeginRead.

Exception Condition
IOException

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

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 EndRead with this IAsyncResult to find out how many bytes were read.

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