SqlCeDataReader.GetBytes Method

Article
10/22/2009

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.SqlServerCe
Assembly: System.Data.SqlServerCe (in system.data.sqlserverce.dll)

Syntax

'Declaration
Public Overrides Function GetBytes ( _
    ordinal As Integer, _
    dataIndex As Long, _
    buffer As Byte(), _
    bufferIndex As Integer, _
    length As Integer _
) As Long

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

public:
virtual long long GetBytes (
    int ordinal, 
    long long dataIndex, 
    array<unsigned char>^ buffer, 
    int bufferIndex, 
    int length
) override

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

Parameters

ordinal
The zero-based column ordinal.

dataIndex
The index within the field from which to begin the read operation.

buffer
The buffer into which to read the stream of bytes.

bufferIndex
The index for buffer to begin the read operation.

length
The maximum length to copy into the buffer.

Return Value

The actual number of bytes read.

Exceptions

Exception type	Condition
InvalidOperationException	The operation is not valid. The SqlCeDataReader may be positioned after the last row in the result set.

Remarks

GetBytes returns the number of available bytes in the field. In most cases, 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 SqlCeDataReader 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.

Thread Safety

Any public static (Shared in Microsoft Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

Development Platforms

Windows Vista, Windows Mobile 5.0, Windows XP Professional with Service Pack 2 (SP2), Windows Server 2003, Windows Mobile 2003 for Pocket PC, Windows CE 5.0
Version Information
.NET Framework and NET Compact Framework
Supported in 3.5
.NET Framework
Supported in 3.0
.NET Compact Framework and .Net Framework
Supported in 2.0

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