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IsDBNull 方法

Specifies whether the specified column is set to null.

命名空間：  Microsoft.SqlServer.Management.Trace
組件：  Microsoft.SqlServer.ConnectionInfoExtended (在 Microsoft.SqlServer.ConnectionInfoExtended.dll 中)

語法

'宣告
Public Function IsDBNull ( _
    ordinal As Integer _
) As Boolean
'用途
Dim instance As TraceReader
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 value that specifies whether the specified column is set to null.
If True, the value is null.
If False, the is not null.

實作

IDataRecord. . :: . .IsDBNull(Int32)

範例

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