IsNull 方法
Checks to see if the data in a buffer column is null.
命名空間： Microsoft.SqlServer.Dts.Pipeline
組件： Microsoft.SqlServer.PipelineHost (在 Microsoft.SqlServer.PipelineHost.dll 中)
語法
'宣告
Public Function IsNull ( _
columnIndex As Integer _
) As Boolean
'用途
Dim instance As PipelineBuffer
Dim columnIndex As Integer
Dim returnValue As Boolean
returnValue = instance.IsNull(columnIndex)
public bool IsNull(
int columnIndex
)
public:
bool IsNull(
int columnIndex
)
member IsNull :
columnIndex:int -> bool
public function IsNull(
columnIndex : int
) : boolean
參數
- columnIndex
型別：System. . :: . .Int32
The index of the column in the buffer row.
傳回值
型別：System. . :: . .Boolean
true if the column contains nullNothingnullptrunitnull 參考 (在 Visual Basic 中為 Nothing); otherwise, false.
備註
It is recommended that you call the IsNull method prior to calling a data type accessor method, such as GetBoolean, because the PipelineBuffer will produce a ColumnIsNullException if the column is null Nothing nullptr unit null 參考 (在 Visual Basic 中為 Nothing) .