DataRelation::ParentKeyConstraint Property
.NET Framework (current version)
Gets the UniqueConstraint that guarantees that values in the parent column of a DataRelation are unique.
Assembly: System.Data (in System.Data.dll)
public: property UniqueConstraint^ ParentKeyConstraint { virtual UniqueConstraint^ get(); }
Property Value
Type: System.Data::UniqueConstraint^A UniqueConstraint that makes sure that values in a parent column are unique.
The following example gets the ParentKeyConstraint of a DataRelation object.
Private Sub GetParentKeyConstraint() ' Get a DataRelation from a DataSet. Dim relation As DataRelation = _ DataSet1.Relations("CustomerOrders") ' Get the relations parent key constraint. Dim constraint As UniqueConstraint = _ relation.ParentKeyConstraint ' Get the constraint's DataColumns Dim constraintColumns() As DataColumn constraintColumns = constraint.Columns ' Print the column names. Dim i As Integer For i = 0 to constraintColumns.GetUpperBound(0) Console.WriteLine(constraintColumns(i).ColumnName.ToString()) Next i End Sub
.NET Framework
Available since 1.1
Available since 1.1
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