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DataRelation.ChildKeyConstraint Property

Gets the ForeignKeyConstraint for the relation.

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

public virtual ForeignKeyConstraint ChildKeyConstraint { get; 
/** @property */
public ForeignKeyConstraint get_ChildKeyConstraint ()

public function get ChildKeyConstraint () : ForeignKeyConstraint

Property Value

A ForeignKeyConstraint.

If no associated ForeignKeyConstraint exists for this relationship, it will be created automatically, and pointed to by the ChildKeyConstraint, when the relation is added to the collection of relations.

The following example sets the UpdateRule, DeleteRule, and AcceptReject rule for the ForeignKeyConstraint associated with the DataRelation.

Private Sub SetChildKeyConstraint(dataSet As DataSet)
   ' Set child and parent columns.
   Dim parentColumn As DataColumn = dataSet.Tables( _
       "Suppliers").Columns("SupplierID")
   Dim childColumn As DataColumn = dataSet.Tables( _
       "Products").Columns("SupplierID")
   Dim relation As DataRelation = New DataRelation( _
       "SuppliersConstraint", parentColumn, childColumn)
   dataSet.Relations.Add(relation)

   Dim foreignKey As ForeignKeyConstraint = _
       relation.ChildKeyConstraint
   foreignKey.DeleteRule = Rule.SetNull
   foreignKey.UpdateRule = Rule.Cascade
   foreignKey.AcceptRejectRule = AcceptRejectRule.Cascade
End Sub

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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