• Articolo

Metodo IsDBNull

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

Spazio dei nomi:  Microsoft.AnalysisServices.AdomdClient
Assembly:  Microsoft.AnalysisServices.AdomdClient (in Microsoft.AnalysisServices.AdomdClient.dll)

Sintassi

'Dichiarazione
Public Function IsDBNull ( _
    ordinal As Integer _
) As Boolean
'Utilizzo
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

Parametri

Valore restituito

Tipo: System. . :: . .Boolean
A Boolean containing true if the column is set to nullNothingnullptrunitriferimento Null (Nothing in Visual Basic).; false otherwise.

Implementa

IDataRecord. . :: . .IsDBNull(Int32)

Osservazioni

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