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DataRelation.ParentKeyConstraint Property

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

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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