DataReaderExtensions.GetChars(DbDataReader, String, Int64, Char[], Int32, Int32) 方法

定义

从指定列中指定索引处开始读取指定字符数,并将其写入从指定位置开始的缓冲区。Reads a specified number of characters from a specified column starting at a specified index, and writes them to a buffer starting at a specified position.

public:
[System::Runtime::CompilerServices::Extension]
 static long GetChars(System::Data::Common::DbDataReader ^ reader, System::String ^ name, long dataOffset, cli::array <char> ^ buffer, int bufferOffset, int length);
public static long GetChars (this System.Data.Common.DbDataReader reader, string name, long dataOffset, char[] buffer, int bufferOffset, int length);
static member GetChars : System.Data.Common.DbDataReader * string * int64 * char[] * int * int -> int64
<Extension()>
Public Function GetChars (reader As DbDataReader, name As String, dataOffset As Long, buffer As Char(), bufferOffset As Integer, length As Integer) As Long

参数

reader
DbDataReader

要从中获取列值的数据读取器。The data reader to get the column value from.

name
String

列的名称。The name of the column.

dataOffset
Int64

行中作为读取操作起始位置的索引。The index within the row from which to begin the read operation.

buffer
Char[]

要将数据复制到的缓冲区。The buffer into which to copy the data.

bufferOffset
Int32

要将数据复制到的位置的缓冲区索引。The index with the buffer to which the data will be copied.

length
Int32

要读取的最大字符数。The maximum number of characters to read.

返回

Int64

读取的实际字符数。The actual number of characters read.

例外

指定的名称不是有效的列名。The name specified is not a valid column name.

适用于

另请参阅