DataRelation.ChildKeyConstraint Properti

Definisi

Ruang nama:

System.Data

Rakitan:

System.Data.Common.dll

Sumber:

DataRelation.cs

ForeignKeyConstraint Mendapatkan untuk relasi.

public:
 virtual property System::Data::ForeignKeyConstraint ^ ChildKeyConstraint { System::Data::ForeignKeyConstraint ^ get(); };

public virtual System.Data.ForeignKeyConstraint? ChildKeyConstraint { get; }

member this.ChildKeyConstraint : System.Data.ForeignKeyConstraint

Public Overridable ReadOnly Property ChildKeyConstraint As ForeignKeyConstraint

Nilai Properti

ForeignKeyConstraint

ForeignKeyConstraint.

Contoh

Contoh berikut menetapkan UpdateRuleaturan , DeleteRule, dan AcceptReject untuk yang ForeignKeyConstraint terkait dengan 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 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

Keterangan

Jika tidak ada yang terkait ForeignKeyConstraint untuk hubungan ini, itu akan dibuat secara otomatis, dan ditujukkan oleh ChildKeyConstraint, ketika relasi ditambahkan ke pengumpulan hubungan.

Lihat juga

• AcceptRejectRule
• ParentKeyConstraint
• Rule