SqlFileStream.BeginRead Method
Begins an asynchronous read operation.
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.IAsyncResultAn IAsyncResult that represents the asynchronous read, which could still be pending.
| Exception | Condition |
|---|---|
| NotSupportedException |
Reading data is not supported on the stream. |
Use the CanRead property to determine whether the current instance supports reading.
Note
|
|---|
|
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. |
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
