DataSet.Relations プロパティ

定義

テーブルをリンクし、親テーブルから子テーブルへ移動できるようにするリレーションシップのコレクションが取得されます。Gets the collection of relations that link tables and allow navigation from parent tables to child tables.

public:
 property System::Data::DataRelationCollection ^ Relations { System::Data::DataRelationCollection ^ get(); };
[System.Data.DataSysDescription("DataSetRelationsDescr")]
public System.Data.DataRelationCollection Relations { get; }
member this.Relations : System.Data.DataRelationCollection
Public ReadOnly Property Relations As DataRelationCollection

プロパティ値

DataRelationCollection オブジェクトのコレクションを格納している DataRelationA DataRelationCollection that contains a collection of DataRelation objects. 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、プロパティをRelations使用してすべての子テーブルの列名を出力します。The following example prints the column name of all child tables through the Relations property.

Private Sub PrintChildRelationRows()
   ' Declare variable to hold the row values.
   Dim rowValues As String
   Dim dataSet As DataSet

   ' Get the DataSet of a DataGrid that is displaying data 
   ' of at least two tables.
   Dim table As DataTable = CType(DataGrid1.DataSource, DataTable)

   ' Navigate using the Relations.
   Dim relation As DataRelation
   Dim row As DataRow
   Dim column As DataColumn

   ' Print the names of each column in each table.
   For Each relation In dataSet.Relations
      For Each column in relation.ChildTable.Columns
          rowValues &= column.ColumnName & " "
      Next
    Next

    ' Display results.
    Console.WriteLine(rowValues)
   End Sub

適用対象

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