此 API 支持 SQL Server 2012 基础结构,但不能通过代码直接使用。
Indicates whether the column contains nonexistent or missing values.
命名空间: Microsoft.SqlServer.Replication.BusinessLogicSupport
程序集: Microsoft.SqlServer.Replication.BusinessLogicSupport(在 Microsoft.SqlServer.Replication.BusinessLogicSupport.dll 中)
语法
声明
Public Function IsDBNull ( _
i As Integer _
) As Boolean
用法
Dim instance As BusinessLogicDataReader
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
- i
类型:System.Int32
The zero-based column ordinal.
返回值
类型:System.Boolean
true if the specified column is equivalent to DBNull; otherwise false.