Hello.
I want create a link betwwen two nodes, but, i would to check before if is possible this link.
Now i was overrited the method OnLinkAdded, but when the link is created, if all conditions are not ok, i need remove the last link created. My questions are:
1.- is possible don’t paint the link before?. By example, i draw the link, chek the condtions and if they all all right paint the link, but if not ok, show a message without draw the link.
2.- Now if have the method: protected override void OnLinkAdded(Link link)
when i check the contions and they are bad, i execute this code:
ar model = this.Diagram.Model;
model.RemoveLink(link.FromData, link.FromPortId, link.ToData,link.ToPortId);
but i have the error:
No se puede cambiar ObservableCollection durante un evento CollectionChanged o PropertyChanged.
In english:
there is not possible change ObservableCollection while a event CollectionChanged o PropertyChanged. <br =“Apple-interchange-newline”>
The stacktrace:
en System.Collections.ObjectModel.ObservableCollection1.CheckReentrancy() en System.Collections.ObjectModel.ObservableCollection1.RemoveItem(Int32 index)
en System.Collections.ObjectModel.Collection1.Remove(T item) en System.Collections.ObjectModel.Collection1.System.Collections.IList.Remove(Object value)
en Northwoods.GoXam.Model.GraphLinksModel4.DeleteLink(LinkType linkdata) en Northwoods.GoXam.Model.GraphLinksModel4.DeleteLink(NodeType fromdata, PortKey fromparam, NodeType todata, PortKey toparam)
en Northwoods.GoXam.Model.GraphLinksModel4.RemoveLink(NodeType fromdata, PortKey fromparam, NodeType todata, PortKey toparam) en Northwoods.GoXam.Model.GraphLinksModel4.#yn(Object fromdata, Object fromparam, Object todata, Object toparam)
en SLRTC1201.Classes.Tools.RtcCustomPartManager.isLinkValid(Link link)
en SLRTC1201.Classes.Tools.RtcCustomPartManager.OnLinkAdded(Link link)
en Northwoods.GoXam.PartManager.AddLinkForData(Object linkdata, IDiagramModel model)
en Northwoods.GoXam.PartManager.OnModelChanged(ModelChangedEventArgs e)
en Northwoods.GoXam.Diagram.#oc(Object sender, ModelChangedEventArgs e)
en Northwoods.GoXam.Model.DiagramModel.OnChanged(ModelChangedEventArgs e)
en Northwoods.GoXam.Model.DiagramModel.#Fk(ModelChange change, Object data, Object oldval, Object newval)
en Northwoods.GoXam.Model.GraphLinksModel4.DoLinkAdded(LinkType linkdata) en Northwoods.GoXam.Model.GraphLinksModel4.#sm(Object sender, NotifyCollectionChangedEventArgs e)
en System.Collections.ObjectModel.ObservableCollection1.OnCollectionChanged(NotifyCollectionChangedEventArgs e) en System.Collections.ObjectModel.ObservableCollection1.InsertItem(Int32 index, T item)
en System.Collections.ObjectModel.Collection1.Add(T item) en System.Collections.ObjectModel.Collection1.System.Collections.IList.Add(Object value)
en Northwoods.GoXam.Model.GraphLinksModel4.InsertLink(LinkType linkdata) en Northwoods.GoXam.Model.GraphLinksModel4.InsertLink(NodeType fromdata, PortKey fromparam, NodeType todata, PortKey toparam)
en Northwoods.GoXam.Model.GraphLinksModel4.AddLink(NodeType fromdata, PortKey fromparam, NodeType todata, PortKey toparam) en Northwoods.GoXam.Model.GraphLinksModel4.#rn(Object fromdata, Object fromparam, Object todata, Object toparam)
en Northwoods.GoXam.Tool.LinkingTool.DoMouseUp()
en Northwoods.GoXam.DiagramPanel.OnMouseLeftButtonUp(MouseButtonEventArgs e)
en Northwoods.GoXam.DiagramPanel.#Iz(Object s, MouseButtonEventArgs e)
en MS.Internal.CoreInvokeHandler.InvokeEventHandler(UInt32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
en MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName, UInt32 flags)
THANKS.