Metodo IsNull
Checks to see if the data in a buffer column is null.
Spazio dei nomi: Microsoft.SqlServer.Dts.Pipeline
Assembly: Microsoft.SqlServer.PipelineHost (in Microsoft.SqlServer.PipelineHost.dll)
Sintassi
'Dichiarazione
Public Function IsNull ( _
columnIndex As Integer _
) As Boolean
'Utilizzo
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
Parametri
- columnIndex
Tipo: System. . :: . .Int32
The index of the column in the buffer row.
Valore restituito
Tipo: System. . :: . .Boolean
true if the column contains nullNothingnullptrunitriferimento Null (Nothing in Visual Basic).; otherwise, false.
Osservazioni
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 riferimento Null (Nothing in Visual Basic). .
Vedere anche