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about node select (Read 198 times)

Nobu YaBB Newbies Offline I Love MindFusion! Posts: 24 Joined: Nov 27^th, 2023	about node select Feb 27^th, 2024 at 2:39am	Print Post
	node.selected = true Executing the above code will result in the following exception Sometimes it occurs and sometimes it does not, and I do not know the conditions. --- [例外] System.Private.CoreLib.dll!System.ThrowHelper.ThrowInvalidOperationException_Inv alidOperation_EnumFailedVersion() 行 432 C# [例外] System.Private.CoreLib.dll!System.Collections.Generic.List<T>.Enumerator.MoveNex t() 行 1130 C# [例外] MindFusion.Diagramming.dll!MindFusion.Diagramming.Selection.() 不明 [例外] MindFusion.Diagramming.dll!MindFusion.Diagramming.Selection.Change(MindFusion.Di agramming.DiagramItem item) 不明 [例外] MindFusion.Diagramming.WinForms.dll!MindFusion.Diagramming.WinForms.Behaviors.Be haviorBase.(System.Drawing.PointF ) 不明 [例外] MindFusion.Diagramming.WinForms.dll!MindFusion.Diagramming.WinForms.Behaviors.Be haviorBase.OnMouseUp(System.Drawing.Point mousePosition, System.Windows.Forms.MouseButtons mouseButton) 不明 [例外] MindFusion.Diagramming.WinForms.dll!MindFusion.Diagramming.WinForms.DiagramView. OnMouseUp(System.Windows.Forms.MouseEventArgs e) 不明 [例外] System.Windows.Forms.dll!System.Windows.Forms.Control.WmMouseUp(ref System.Windows.Forms.Message m, System.Windows.Forms.MouseButtons button, int clicks) 行 12439 C# [例外] System.Windows.Forms.dll!System.Windows.Forms.Control.WndProc(ref System.Windows.Forms.Message m) 行 13229 C# [例外] MindFusion.Diagramming.WinForms.dll!MindFusion.Diagramming.WinForms.DiagramView. WndProc(ref System.Windows.Forms.Message m) 不明 [例外] System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.OnMess age(ref System.Windows.Forms.Message m) 行 67 C# [例外] System.Windows.Forms.dll!System.Windows.Forms.Control.ControlNativeWindow.WndPro c(ref System.Windows.Forms.Message m) 行 117 C# [例外] System.Windows.Forms.dll!System.Windows.Forms.NativeWindow.Callback(System.IntPt r hWnd, Interop.User32.WM msg, System.IntPtr wparam, System.IntPtr lparam) 行 370 C# [例外] System.Windows.Forms.dll!System.Windows.Forms.Application.ComponentManager.Inter op.Mso.IMsoComponentManager.FPushMessageLoop(System.UIntPtr dwComponentID, Interop.Mso.msoloop uReason, void* pvLoopData) 行 346 C# [例外] System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessa geLoopInner(Interop.Mso.msoloop reason, System.Windows.Forms.ApplicationContext context) 行 1117 C# [例外] System.Windows.Forms.dll!System.Windows.Forms.Application.ThreadContext.RunMessa geLoop(Interop.Mso.msoloop reason, System.Windows.Forms.ApplicationContext context) 行 981 C# [例外] System.Windows.Forms.dll!System.Windows.Forms.Application.Run(System.Windows.For ms.Form mainForm) 行 1188 C# [例外] MainScreen.dll!Messiah.MainScreen.Program.Main() 行 14


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Slavcho YaBB Moderator Offline tech.support Posts: 3171 Joined: Oct 19^th, 2005	Re: about node select Reply #1 - Feb 27^th, 2024 at 7:35am	Print Post
	That could happen if you change selection state from NodeDeselected / LinkDeselected events. In that callstack they are raised within a loop over selection.Items; node.Selected setter modifies that collection, which .NET does not allow during enumeration. If you are trying to prevent users from selecting or deselecting an item by toggling Selected property after the fact, try handling respective validation event instead, such as NodeSelecting. If you need to copy selection state of an item to other items, try doing that from SelectionChanged event handler, which is raised once for whole selection after the loop. Regards, Slavcho Mindfusion


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Nobu YaBB Newbies Offline I Love MindFusion! Posts: 24 Joined: Nov 27^th, 2023	Re: about node select Reply #2 - Feb 27^th, 2024 at 8:19am	Print Post
	Thank you for your response. I will try it. Regards, Nobu


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