通过

IsDBNull 方法

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

命名空间：  Microsoft.AnalysisServices.AdomdServer
程序集：  msmgdsrv（在 msmgdsrv.dll 中）

语法

声明
Public Function IsDBNull ( _
    i As Integer _
) As Boolean
用法
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

参数

返回值

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

实现

IDataRecord. . :: . .IsDBNull(Int32)

注释

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.