OleDbDataReader::GetBytes Method (Int32, Int64, array<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.
Assembly: System.Data (in System.Data.dll)
public: virtual long long GetBytes( int ordinal, long long dataIndex, array<unsigned char>^ buffer, int bufferIndex, int length ) override
Parameters
- ordinal
-
Type:
System::Int32
The zero-based column ordinal.
- dataIndex
-
Type:
System::Int64
The index within the field from which to start the read operation.
- buffer
-
Type:
array<System::Byte>^
The buffer into which to read the stream of bytes.
- bufferIndex
-
Type:
System::Int32
The index within the buffer where the write operation is to start.
- length
-
Type:
System::Int32
The maximum length to copy into the buffer.
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.
Available since 1.1
OleDbDataReader Class
System.Data.OleDb Namespace
Working with DataReaders