OleDbDataReader.GetByte(Int32) 方法

定义

以字节的形式获取指定列的值。Gets the value of the specified column as a byte.

public:
 virtual System::Byte GetByte(int ordinal);
public byte GetByte (int ordinal);
override this.GetByte : int -> byte
Public Function GetByte (ordinal As Integer) As Byte

参数

ordinal
Int32

从零开始的列序号。The zero-based column ordinal.

返回

指定列的字节形式的值。The value of the specified column as a byte.

异常

指定的强制转换无效。The specified cast is not valid.

注解

不执行任何转换;因此,检索的数据必须已是一个字节。No conversions are performed; therefore the data retrieved must already be a byte.

调用IsDBNull此方法之前,调用以查找 null 值。Call IsDBNull to look for null values before calling this method.

适用于

另请参阅