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.NET Forum / Windows Forms / WinForm General / September 2005TreeNode collapse method does not persist the state of the sub-nodes
Hi all, I haven't been able to find any post regarding this problem... the MSDN help about TreeNode.Collapse clearly says: "The state of a TreeNode is persisted. For example, if the next level of child nodes was not collapsed previously, when the Expand method is called, the child nodes appear in their previously expanded state." but what actually happens, is that all the sub node are collapsed as well...is that the normal behaviour? how can I persist their state? Thanks, Amidan. This works just like the documentation for me, on vs2003, with framework 1.1.4322 SP1. I'd check to see if you have any code in the treeview's BeforeCollapse, BeforeExpand, AfterCollapse, or AfterExpand event handlers that might be affecting what's going on. HTH, Tom Dacon Dacon Software Consulting > Hi all, > [quoted text clipped - 10 lines] > Thanks, > Amidan. It's a bug (or a documentation error): http://groups.google.se/group/microsoft.public.dotnet.framework.windowsforms.con trols/browse_thread/thread/ec14b36a753a0fd9/41a1d812df4d8c27?lnk=st&q=treeview+c ollapse+author:Claes+author:Bergefall&rnum=1&hl=sv#41a1d812df4d8c27 /claes > Hi all, > [quoted text clipped - 10 lines] > Thanks, > Amidan. To have it work according to the docs you'll need to use P/Invoke and send a TVM_EXPAND message to it That will persist the state of the subnodes Public Declare Auto Function SendMessage Lib "User32.dll" (ByVal hwnd As IntPtr, ByVal msg As Integer, ByVal wParam As Integer, ByVal lParam As IntPtr) As Integer Public Const TV_FIRST As Integer = &H1100 Public Const TVM_EXPAND As Integer = TV_FIRST + 2 Public Const TVE_COLLAPSE As Integer = &H1 Public Const TVE_EXPAND As Integer = &H2 Public Const TVE_TOGGLE As Integer = &H3 .... SendMessage(myTreeView.Handle, TVM_EXPAND, TVE_COLLAPSE, myTreeNode.Handle) /claes > It's a bug (or a documentation error): > [quoted text clipped - 16 lines] >> Thanks, >> Amidan. Claes, thank you very much, that solved the problem (though had to translate it to C#). searched for hours for this kind of solution... cheers, Amidan. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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