IsNull 方法

Checks whether a specified column is null.

命名空间：  Microsoft.SqlServer.Dts.Pipeline.Wrapper
程序集：  Microsoft.SqlServer.DTSPipelineWrap（在 Microsoft.SqlServer.DTSPipelineWrap.dll 中）

语法

声明
Sub IsNull ( _
    hRow As Integer, _
    hCol As Integer, _
    <OutAttribute> ByRef pfNull As Boolean _
)
用法
Dim instance As IDTSBuffer100
Dim hRow As Integer
Dim hCol As Integer
Dim pfNull As Boolean

instance.IsNull(hRow, hCol, pfNull)

void IsNull(
    int hRow,
    int hCol,
    out bool pfNull
)

void IsNull(
    [InAttribute] int hRow, 
    [InAttribute] int hCol, 
    [InAttribute] [OutAttribute] bool% pfNull
)

abstract IsNull : 
        hRow:int * 
        hCol:int * 
        pfNull:bool byref -> unit 

function IsNull(
    hRow : int, 
    hCol : int, 
    pfNull : boolean
)

参数

• hRow
  类型：System. . :: . .Int32
  The handle of the row.

• hCol
  类型：System. . :: . .Int32
  The handle of the column.

• pfNull
  类型：System. . :: . .Boolean%
  An out parameter that indicates whether the column value is null.

注释

This method checks whether the data stored in the buffer column is null or empty. Managed data flow component developers do not call this method, but instead use the IsNull method of the managed PipelineBuffer class.

请参阅

参考

IDTSBuffer100 接口

Microsoft.SqlServer.Dts.Pipeline.Wrapper 命名空间