DataRelation.ParentKeyConstraint Property

 
System_CAPS_noteNote

The .NET API Reference documentation has a new home. Visit the .NET API Browser on docs.microsoft.com to see the new experience.

Gets the UniqueConstraint that guarantees that values in the parent column of a DataRelation are unique.

Namespace:   System.Data
Assembly:  System.Data (in System.Data.dll)

public virtual UniqueConstraint ParentKeyConstraint { 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
Return to top
Show: