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We can eliminate creating two links for the same two symbols by checking the link nodes FromNode, ToNode properties. While creating lines we have to check the end points, if its end points is already exists with the symbols then we have to remove the link. While creating links we can get the link endpoints using ConnectionsChanged event. C# //Adding ConnectionChanged event ((DocumentEventSink)model1.EventSink).ConnectionsChanged += new CollectionExEventHandler(MainForm_ConnectionsChanged); //Event void MainForm_ConnectionsChanged(CollectionExEventArgs evtArgs) { if (evtArgs.ChangeType == CollectionExChangeType.Insert) { foreach (Node n1 in this.diagram1.Model.Nodes) { Line tl = n1 as Line; if (n1 is Line) { Line lc1 = n1 as Line; foreach (Node n in this.diagram1.Model.Nodes) { if (n is Line && n != n1) { Line lc = n as Line; if (((lc1.FromNode == lc.FromNode) && (lc1.ToNode == lc.ToNode)) || ((lc1.ToNode == lc.FromNode) && (lc1.FromNode == lc.ToNode))) { this.diagram1.Model.RemoveChild(lc1); MessageBox.Show("Aleardy link has created for the Symbols"); } } } } } } } VB ''Adding ConnectionChanged event AddHandler (CType(model1.EventSink, DocumentEventSink)).ConnectionsChanged, AddressOf MainForm_ConnectionsChanged ''Event void MainForm_ConnectionsChanged(CollectionExEventArgs evtArgs) If evtArgs.ChangeType = CollectionExChangeType.Insert Then For Each n1 As Node In Me.diagram1.Model.Nodes Dim tl As Line = TryCast(n1, Line) If TypeOf n1 Is Line Then Dim lc1 As Line = TryCast(n1, Line) For Each n As Node In Me.diagram1.Model.Nodes If TypeOf n Is Line AndAlso Not n Is n1 Then Dim lc As Line = TryCast(n, Line) If ((lc1.FromNode = lc.FromNode) AndAlso (lc1.ToNode = lc.ToNode)) OrElse ((lc1.ToNode = lc.FromNode) AndAlso (lc1.FromNode = lc.ToNode)) Then Me.diagram1.Model.RemoveChild(lc1) MessageBox.Show("Aleardy link has created for the Symbols") End If End If Next n End If Next n1 End If Please refer the sample in the below link which illustrates the above: http://websamples.syncfusion.com/samples/kb/diagram.windows/diagramsinglelink/main.htm |
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