GetChars(Int32,Int64,Char[],Int32,Int32) Method

In This Topic

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

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Overrides Function GetChars( _
   ByVal ordinal As Integer, _
   ByVal fieldOffset As Long, _
   ByVal buffer() As Char, _
   ByVal bufferOffset As Integer, _
   ByVal length As Integer _
) As Long

public override long GetChars( 
   int ordinal,
   long fieldOffset,
   char[] buffer,
   int bufferOffset,
   int length
)

Parameters

ordinal: The zero-based column ordinal.
fieldOffset: The index within the row where the read operation is to begin.
buffer: The buffer into which to copy data.
bufferOffset: The index where buffer is to begin the write operation.
length: The maximum number of characters to read.

Return Value

The actual number of characters read.

Remarks

GetChars returns the number of available characters 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 GetChars has already been used to obtain characters from the field. This may be the case, for example, if the DbDataReaderBase is reading a large data structure into a buffer. For more information, see the SequentialAccess setting of System.Data.CommandBehavior in the Microsoft .NET Framework SDK documentation.

If you pass a buffer that is a null value. GetChars returns the length of the field in characters.

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

DbDataReaderBase Class
DbDataReaderBase Members
Overload List

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