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FileStream.BeginRead Method

May 02, 2013

Begins an asynchronous read.

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

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

offset: Type: System.Int32
The byte offset in array at which to begin reading.

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

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

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

Exception	Condition
ArgumentException	The array length minus offset is less than numBytes.
ArgumentNullException	array is null.
ArgumentOutOfRangeException	offset or numBytes is negative.
IOException	An asynchronous read was attempted past the end of the file.

Supported in: 8.0, 7.1, 7.0

Windows Phone

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