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OdbcDataReader.GetBytes Method

Reads a stream of bytes from the specified column offset into the buffer as an array, starting at the particular buffer offset.

Namespace: System.Data.Odbc
Assembly: System.Data (in system.data.dll)

public override long GetBytes (
	int i,
	long dataIndex,
	byte[] buffer,
	int bufferIndex,
	int length
)
public long GetBytes (
	int i, 
	long dataIndex, 
	byte[] buffer, 
	int bufferIndex, 
	int length
)
public override function GetBytes (
	i : int, 
	dataIndex : long, 
	buffer : byte[], 
	bufferIndex : int, 
	length : int
) : long

Parameters

i

The zero-based column ordinal.

dataIndex

The index within the field where the read operation is to start.

buffer

The buffer into which to read the stream of bytes.

bufferIndex

The index where buffer is to start the write operation.

length

The number of bytes to read.

Return Value

The 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, if the OdbcDataReader 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 value, GetBytes returns the length of the field in bytes.

Conversions are performed based on the underlying capabilities of the ODBC driver. If the conversion is not supported then the method call will fail.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1

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