Assembly: System.Data (in system.data.dll)
public override long GetBytes ( int ordinal, long dataIndex, byte buffer, int bufferIndex, int length )
public long GetBytes ( int ordinal, long dataIndex, byte buffer, int bufferIndex, int length )
public override function GetBytes ( ordinal : int, dataIndex : long, buffer : byte, bufferIndex : int, length : int ) : long
The zero-based column ordinal.
The index within the field from which to start the read operation.
The buffer into which to read the stream of bytes.
The index within the buffer where the write operation is to start.
The maximum length to copy into the buffer.
Return ValueThe actual number of bytes read.
GetBytes returns the number of available bytes in the field. Most of the time this is the exact length of the field. However, the number returned may be less than the true length of the field if GetBytes has already been used to obtain bytes from the field. This may be the case, for example, when the OleDbDataReader is reading a large data structure into a buffer. For more information, see the SequentialAccess setting for CommandBehavior.
If you pass a buffer that is a null reference (Nothing in Visual Basic), GetBytes returns the length of the field in bytes.
No conversions are performed; therefore, the data retrieved must already be a byte array.
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.