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DataRelation.ChildKeyConstraint Property

Gets the ForeignKeyConstraint for the relation.

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

'Declaration
Public Overridable ReadOnly Property ChildKeyConstraint As ForeignKeyConstraint

Property Value

Type: System.Data.ForeignKeyConstraint
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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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