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SqlFileStream.BeginRead Method

Begins an asynchronous read operation.

Namespace:  System.Data.SqlTypes
Assembly:  System.Data (in System.Data.dll)

[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public override IAsyncResult BeginRead(
	byte[] buffer,
	int offset,
	int count,
	AsyncCallback callback,
	Object state
)

Parameters

buffer
Type: System.Byte[]

The buffer to read the data into.

offset
Type: System.Int32

The byte offset in buffer at which to begin writing data read from the stream.

count
Type: System.Int32

The maximum number of bytes to read.

callback
Type: System.AsyncCallback

An optional asynchronous callback, to be called when the read is complete.

state
Type: System.Object

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

Return Value

Type: System.IAsyncResult
An IAsyncResult that represents the asynchronous read, which could still be pending.

ExceptionCondition
NotSupportedException

Reading data is not supported on the stream.

Use the CanRead property to determine whether the current instance supports reading.

NoteNote

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5 SP1, 3.0 SP2, 2.0 SP2

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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