IsValid 属性
Gets a value that indicates whether an input column references an upstream column.
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
ReadOnly Property IsValid As Boolean
Get
用法
Dim instance As IDTSInputColumn100
Dim value As Boolean
value = instance.IsValid
bool IsValid { get; }
property bool IsValid {
bool get ();
}
abstract IsValid : bool
function get IsValid () : boolean
属性值
类型：System. . :: . .Boolean
true if the IDTSOutputColumn100 object still exists and has the same properties; otherwise, false.
注释
Input columns always reference an output column from an upstream component. The output column of the upstream component is identified by the LineageID property of the input column. An input column is no longer valid if a column upstream from the input column cannot be found that has the same lineage ID as the input column. These types of columns are often referred to as orphans because their origination no longer exists.