OleDbDataReader.GetBytes Method (Int32, Int64, Byte[], Int32, Int32)


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

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

public override long GetBytes(
	int ordinal,
	long dataIndex,
	byte[] buffer,
	int bufferIndex,
	int length


Type: System.Int32

The zero-based column ordinal.

Type: System.Int64

The index within the field from which to start the read operation.

Type: System.Byte[]

The buffer into which to read the stream of bytes.

Type: System.Int32

The index within the buffer where the write operation is to start.

Type: System.Int32

The maximum length to copy into the buffer.

Return Value

Type: System.Int64

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, 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 null, GetBytes returns the length of the field in bytes.

No conversions are performed; therefore, the data retrieved must already be a byte array.

.NET Framework
Available since 1.1
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