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

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Definition

Namespace:
System.Data.Odbc
Assembly:
System.Data.Odbc.dll
Assembly:
System.Data.dll
Package:
System.Data.Odbc v8.0.1
Package:
System.Data.Odbc v9.0.0-rc.2.24473.5
Source:
OdbcDataReader.cs
Source:
OdbcDataReader.cs

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

public:
 override long GetBytes(int i, long dataIndex, cli::array <System::Byte> ^ buffer, int bufferIndex, int length);
public:
 virtual long GetBytes(int i, long dataIndex, cli::array <System::Byte> ^ buffer, int bufferIndex, int length);
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 long GetBytes (int i, long dataIndex, byte[] buffer, int bufferIndex, int length);
override this.GetBytes : int * int64 * byte[] * int * int -> int64
abstract member GetBytes : int * int64 * byte[] * int * int -> int64
override this.GetBytes : int * int64 * byte[] * int * int -> int64
Public Overrides Function GetBytes (i As Integer, dataIndex As Long, buffer As Byte(), bufferIndex As Integer, length As Integer) As Long
Public Function GetBytes (i As Integer, dataIndex As Long, buffer As Byte(), bufferIndex As Integer, length As Integer) As Long

Parameters

i
Int32

The zero-based column ordinal.

dataIndex
Int64

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

buffer
Byte[]

The buffer into which to read the stream of bytes.

bufferIndex
Int32

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

length
Int32

The number of bytes to read.

Returns

Int64

The actual number of bytes read.

Implements

GetBytes(Int32, Int64, Byte[], Int32, Int32)

Remarks

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.

Note

No exception will be thrown if the value of bufferIndex is outside the array. No data will be read and the method will return 0.

Applies to

See also