共用方式為


IsDBNull 方法

Returns a Boolean that contains a value indicating whether the column is set to null.

命名空間:  Microsoft.AnalysisServices.AdomdClient
組件:  Microsoft.AnalysisServices.AdomdClient (在 Microsoft.AnalysisServices.AdomdClient.dll 中)

語法

'宣告
Public Function IsDBNull ( _
    ordinal As Integer _
) As Boolean
'用途
Dim instance As AdomdDataReader
Dim ordinal As Integer
Dim returnValue As Boolean

returnValue = instance.IsDBNull(ordinal)
public bool IsDBNull(
    int ordinal
)
public:
virtual bool IsDBNull(
    int ordinal
) sealed
abstract IsDBNull : 
        ordinal:int -> bool 
override IsDBNull : 
        ordinal:int -> bool 
public final function IsDBNull(
    ordinal : int
) : boolean

參數

傳回值

型別:System. . :: . .Boolean
A Boolean containing true if the column is set to nullNothingnullptrunitnull 參考 (在 Visual Basic 中為 Nothing); false otherwise.

實作

IDataRecord. . :: . .IsDBNull(Int32)

備註

Call this method to check for null Nothing nullptr unit null 參考 (在 Visual Basic 中為 Nothing) column values before calling the typed methods used to retrieve column values (for example, GetByte, GetChar, and so on), to avoid raising an error.