IsDBNull 方法

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

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

語法

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

returnValue = instance.IsDBNull(i)

public bool IsDBNull(
    int i
)

public:
virtual bool IsDBNull(
    int i
) sealed

abstract IsDBNull : 
        i:int -> bool 
override IsDBNull : 
        i:int -> bool 

public final function IsDBNull(
    i : int
) : boolean

參數

• i
  型別：System. . :: . .Int32
  The zero-based ordinal position of the column to find.

傳回值

型別：System. . :: . .Boolean
A Boolean containing true if the column is set to null; false otherwise.

實作

IDataRecord. . :: . .IsDBNull(Int32)

備註

Call this method to check for null column values before calling the typed methods used to retrieve column values (for example, GetByte, GetChar, and so on), to avoid raising an error.

請參閱

參考

AdomdDataReader 類別

Microsoft.AnalysisServices.AdomdServer 命名空間