DataRelation.ParentKeyConstraint Property
Definition
Important
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Gets the UniqueConstraint that guarantees that values in the parent column of a DataRelation are unique.
public:
virtual property System::Data::UniqueConstraint ^ ParentKeyConstraint { System::Data::UniqueConstraint ^ get(); };
public virtual System.Data.UniqueConstraint? ParentKeyConstraint { get; }
public virtual System.Data.UniqueConstraint ParentKeyConstraint { get; }
member this.ParentKeyConstraint : System.Data.UniqueConstraint
Public Overridable ReadOnly Property ParentKeyConstraint As UniqueConstraint
Property Value
A UniqueConstraint that makes sure that values in a parent column are unique.
Examples
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
Applies to
See also
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