IsNull 方法
Gets a Boolean value that specifies whether value of the data at the specified column position is null.
命名空间： Microsoft.SqlServer.Management.Trace
程序集： Microsoft.SqlServer.ConnectionInfoExtended（在 Microsoft.SqlServer.ConnectionInfoExtended.dll 中）
语法
声明
Public Function IsNull ( _
ordinal As Integer _
) As Boolean
用法
Dim instance As TraceReader
Dim ordinal As Integer
Dim returnValue As Boolean
returnValue = instance.IsNull(ordinal)
public bool IsNull(
int ordinal
)
public:
bool IsNull(
int ordinal
)
member IsNull :
ordinal:int -> bool
public function IsNull(
ordinal : int
) : boolean
参数
- ordinal
类型：System. . :: . .Int32
An Int32 value that specifies the column position of the data.
返回值
类型：System. . :: . .Boolean
A Boolean value that specifies whether value of the data at the specified column is null.
If True, the value is null.
If False, the value is not null.