DataTable.ParentRelations プロパティ

定義

この DataTable の親リレーションシップのコレクションを取得します。Gets the collection of parent relations for this DataTable.

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

プロパティ値

テーブルの親リレーションを格納している DataRelationCollectionA DataRelationCollection that contains the parent relations for the table. DataRelation オブジェクトが存在しない場合、空のコレクションが返されます。An empty collection is returned if no DataRelation objects exist.

属性

次の例ではParentRelations 、プロパティを使用しDataRelationて、 DataTable内の各親を取得します。The following example uses the ParentRelations property to return each parent DataRelation in a DataTable. 各リレーションシップは、行の配列を返すためGetParentRowsに、 DataRowのメソッドの引数として使用されます。Each relation is then used as an argument in the GetParentRows method of the DataRow to return an array of rows. 行の各列の値が出力されます。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

適用対象

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