Gets the constraint which ensures values in a column are unique.
[Visual Basic] Overridable Public ReadOnly Property ParentKeyConstraint As _ UniqueConstraint [C#] public UniqueConstraint ParentKeyConstraint {virtual get;} [C++] public: __property virtual UniqueConstraint* get_ParentKeyConstraint(); [JScript] public function get ParentKeyConstraint() : UniqueConstraint;
The following example gets the ParentKeyConstraint of a DataRelation object.
[Visual Basic]
Private Sub GetParentKeyConstraint() Dim pkCstrt As UniqueConstraint ' Get a DataRelation from a DataSet. Dim rel As DataRelation rel = DataSet1.Relations("CustomerOrders") ' Get the relations parent key constraint. pkCstrt = rel.ParentKeyConstraint ' Get the constraint's DataColumns Dim cstrtCols() As DataColumn cstrtCols = pkCstrt.Columns ' Print the column names. Dim i As Integer For i = 0 to Ubound(cstrtCols) Debug.Print cstrtCols(i).ColumnName Next i End Sub
DataRelation Class | DataRelation Members | System.Data Namespace | ChildKeyConstraint | UniqueConstraint