OleDbDataReader.GetGuid(Int32) 方法
定义
作为全局唯一标识符 (GUID) 获取指定列的值。Gets the value of the specified column as a globally unique identifier (GUID).
public:
override Guid GetGuid(int ordinal);
public:
virtual Guid GetGuid(int ordinal);
public override Guid GetGuid (int ordinal);
public Guid GetGuid (int ordinal);
override this.GetGuid : int -> Guid
abstract member GetGuid : int -> Guid
override this.GetGuid : int -> Guid
Public Overrides Function GetGuid (ordinal As Integer) As Guid
Public Function GetGuid (ordinal As Integer) As Guid
参数
- ordinal
- Int32
从零开始的列序号。The zero-based column ordinal.
返回
指定列的值。The value of the specified column.
实现
例外
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,检索的数据必须已经是全局唯一标识符。No conversions are performed; therefore the data retrieved must already be a globally unique identifier.
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.