DataTable.ParentRelations 属性

定义

获取该 DataTable 的父关系的集合。Gets the collection of parent relations for this DataTable.

public:
 property System::Data::DataRelationCollection ^ ParentRelations { System::Data::DataRelationCollection ^ get(); };
public System.Data.DataRelationCollection ParentRelations { get; }
[System.ComponentModel.Browsable(false)]
public System.Data.DataRelationCollection ParentRelations { get; }
[System.ComponentModel.Browsable(false)]
[System.Data.DataSysDescription("DataTableParentRelationsDescr")]
public System.Data.DataRelationCollection ParentRelations { get; }
member this.ParentRelations : System.Data.DataRelationCollection
[<System.ComponentModel.Browsable(false)>]
member this.ParentRelations : System.Data.DataRelationCollection
[<System.ComponentModel.Browsable(false)>]
[<System.Data.DataSysDescription("DataTableParentRelationsDescr")>]
member this.ParentRelations : System.Data.DataRelationCollection
Public ReadOnly Property ParentRelations As DataRelationCollection

属性值

DataRelationCollection

一个 DataRelationCollection,包含该表的父关系。A DataRelationCollection that contains the parent relations for the table. 如果 DataRelation 对象不存在,将返回空集合。An empty collection is returned if no DataRelation objects exist.

属性

示例

下面的示例使用 ParentRelations 属性返回中的每个父级 DataRelation DataTableThe following example uses the ParentRelations property to return each parent DataRelation in a DataTable. 然后,每个关系在的方法中用作参数 GetParentRows DataRow 以返回行的数组。Each relation is then used as an argument in the GetParentRows method of the DataRow to return an array of rows. 然后打印该行中每列的值。The value of each column in the row is then printed.

private void GetChildRowsFromDataRelation(DataTable table)
{
    DataRow[] rowArray;
    foreach(DataRelation relation in table.ParentRelations)
    {
        foreach(DataRow row in table.Rows)
        {
            rowArray = row.GetParentRows(relation);
            // Print values of rows.
            for(int i = 0; i < rowArray.Length; i++)
            {
                foreach(DataColumn column in table.Columns)
                {
                    Console.WriteLine(rowArray[i][column]);
                }
            }
        }
    }
}
Private Sub GetChildRowsFromDataRelation(table As DataTable)
    Dim rowArray() As DataRow
    Dim relation As DataRelation, row As DataRow
    Dim column As DataColumn, i As Integer     
    For Each relation In  table.ParentRelations
        For Each row In  table.Rows
            rowArray = row.GetParentRows(relation)
            ' Print values of rows.             
            For i = 0 To rowArray.Length - 1                 
                For Each column In  table.Columns
                    Console.WriteLine(rowArray(i)(column))
                Next column
            Next i
        Next row
    Next relation
End Sub

适用于

另请参阅