Data Reader. Get Chars(Int32, Int64, Char, Int32, Int32) Method
Reads a stream of characters from the specified column offset into the buffer as an array starting at the given buffer offset.
public: virtual long GetChars(int i, long dataIndex, cli::array <char> ^ buffer, int bufferIndex, int length);
public long GetChars (int i, long dataIndex, char buffer, int bufferIndex, int length);
abstract member GetChars : int * int64 * char * int * int -> int64 override this.GetChars : int * int64 * char * int * int -> int64
Public Function GetChars (i As Integer, dataIndex As Long, buffer As Char(), bufferIndex As Integer, length As Integer) As Long
The zero-based column ordinal.
The index within the field from which to begin the read operation.
The buffer into which to read the stream of bytes.
The index within the
buffer where the write operation is to start.
The maximum length to copy into the buffer.
The actual number of characters read.
GetChars returns the number of available characters in the field. Frequently 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 SqlDataReader is reading a large data structure into a buffer. For more information, see the
SequentialAccess setting for CommandBehavior.
The actual number of characters read can be less than the requested length, if the end of the field is reached. If you pass a buffer that is
null, GetChars returns the length of the entire field in characters, not the remaining size based on the buffer offset parameter.
No conversions are performed; therefore. the data retrieved must already be a character array.
The GetChars method returns 0 when
dataIndex is negative.