Gets the array of columns that this constraint constrains.
[Visual Basic] Overridable Public ReadOnly Property Columns As DataColumn () [C#] public DataColumn[] Columns {virtual get;} [C++] public: __property virtual DataColumn* get_Columns(); [JScript] public function get Columns() : DataColumn[];
An array of DataColumn objects.
The following example returns the DataColumn objects that the UniqueConstraint constrains.
[Visual Basic]
Private Sub GetColsFromConstraint() Dim dCols() As DataColumn ' Get a named relation from a DataSet. Dim rel As DataRelation Set rel = DataSet1.Relations("CustomerOrders") ' Get the ParentKeyConstraint Dim cstrt As UniqueConstraint Set cstrt= rel.ParentKeyConstraint ' Get the DataColumn objects being constrained. Set dCols = cstrt.Columns ' Print the column name of each column. Dim i As Integer For i = 0 to Ubound(dCols) Debug.Print dCols(i).ColumnName Next i End Sub
UniqueConstraint Class | UniqueConstraint Members | System.Data Namespace