AdomdDataReader.GetChars 方法
Returns an array of Char objects that contain a stream of values from the specified column.
命名空间： Microsoft.AnalysisServices.AdomdClient
程序集： Microsoft.AnalysisServices.AdomdClient（在 Microsoft.AnalysisServices.AdomdClient.dll 中）
语法
声明
Public Function GetChars ( _
ordinal As Integer, _
dataIndex As Long, _
buffer As Char(), _
bufferIndex As Integer, _
length As Integer _
) As Long
用法
Dim instance As AdomdDataReader
Dim ordinal As Integer
Dim dataIndex As Long
Dim buffer As Char()
Dim bufferIndex As Integer
Dim length As Integer
Dim returnValue As Long
returnValue = instance.GetChars(ordinal, _
dataIndex, buffer, bufferIndex, length)
public long GetChars(
int ordinal,
long dataIndex,
char[] buffer,
int bufferIndex,
int length
)
public:
virtual long long GetChars(
int ordinal,
long long dataIndex,
array<wchar_t>^ buffer,
int bufferIndex,
int length
) sealed
abstract GetChars :
ordinal:int *
dataIndex:int64 *
buffer:char[] *
bufferIndex:int *
length:int -> int64
override GetChars :
ordinal:int *
dataIndex:int64 *
buffer:char[] *
bufferIndex:int *
length:int -> int64
public final function GetChars(
ordinal : int,
dataIndex : long,
buffer : char[],
bufferIndex : int,
length : int
) : long
参数
- ordinal
类型：System.Int32
The zero-based ordinal position of the column to be retrieved.
- dataIndex
类型：System.Int64
The zero-based index within the column from which to begin reading data.
- buffer
类型：array<System.Char[]
The buffer into which to read the stream of characters.
- bufferIndex
类型：System.Int32
The zero-based index within the buffer from which to begin writing data.
- length
类型：System.Int32
The number of characters to read from the column.
返回值
类型：System.Int64
A Long that contains the number of characters actually read from the column.
实现
IDataRecord.GetChars(Int32, Int64, array<Char[], Int32, Int32)
异常
| 异常 | 条件 |
|---|---|
| System.IndexOutOfRangeException | The value ofdataIndex is greater than Int32.MaxValue. The value of bufferIndex is less than 0 or greater than the total of length and the length of buffer. |
注释
The GetChars method 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.
If you pass a nullnull 引用（在 Visual Basic 中为 Nothing） reference (Nothing in Visual Basic) in the buffer parameter, GetBytes returns the length of the column in characters.
No conversions are performed; therefore the data retrieved must already be a character array.