AdomdDataReader.IsDBNull 方法
Returns a Boolean that contains a value indicating whether the column is set to null.
命名空间： Microsoft.AnalysisServices.AdomdClient
程序集： Microsoft.AnalysisServices.AdomdClient（在 Microsoft.AnalysisServices.AdomdClient.dll 中）
语法
声明
Public Function IsDBNull ( _
ordinal As Integer _
) As Boolean
用法
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
参数
- ordinal
类型：System.Int32
The zero-based ordinal position of the column to find.
返回值
类型：System.Boolean
A Boolean containing true if the column is set to nullnull 引用（在 Visual Basic 中为 Nothing）; false otherwise.
实现
注释
Call this method to check for nullnull 引用（在 Visual Basic 中为 Nothing） column values before calling the typed methods used to retrieve column values (for example, GetByte, GetChar, and so on), to avoid raising an error.