I'm data binding to a collection of objects at run-time. If(WindowState = FormWindowState.I'm having the same problem as Donald Hylton, where I have two HierarchicalDataTemplates and different ItemContainerStyle resources that specify the OptionType explicitly, however the List still seems to disobey these rules. Protected override void WndProc(ref Message m) Public static extern int RegisterWindowMessage(string message) Public static extern bool PostMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam) Public static readonly int WM_SHOWME = RegisterWindowMessage("WM_SHOWME") Public const int HWND_BROADCAST = 0xffff this class just wraps some Win32 stuff that we're going to use send our Win32 message to make the currently running instance Static Mutex mutex = new Mutex(true, "") Īpplication.SetCompatibleTextRenderingDefault(false) In the class of my application main I created a static named Mutex: static class Program Knowing that I could use a mutex for this (but never having done itīefore) I set out to cut down my code and simplify my life. While this works, itīrings on a lot of overhead, and I wanted something cleaner. Instance of my myapp.exe in the process list. Today I wanted to refactor some code that prohibited my applicationįrom running multiple instances of itself. The words belong solely to the blog owner at Sanity Free Coding. I'm reproducing the content of the article here for posterity. That makes me worry that eventually it might disappear, and with it, the advocated solution. UPDATEĪs of, the article I linked to above is still active, but the blog hasn't been updated in a while. That's a very nice touch that the other Mutex solutions described here do not address. Second, the article shows how to bring the existing instance of the application to the foreground when the user tries to start another instance. But as it is, I do not use the Microsoft.VisualBasic assembly, and I'd rather not add an unnecessary dependency to my project. If my project already had a dependency on that assembly, I would probably advocate using the approach shown in another answer. The approach described by the article is advantageous for two reasons.įirst, it does not require a dependency on the Microsoft.VisualBasic assembly. Here is a very good article regarding the Mutex solution. But that is outside the scope of this answer. If you don't want that, then you will have to supply different templates for different levels of nodes. If you have third level nodes in the future, they also will be pulled to the left. Thus all of the child nodes will be pulled to the left a little. That means that its left margin is negative and thus spills out of the grid column containing it in the left direction. Pay special attention to the ItemsPresenter element named ItemsHost. This is just the simplest way to do it if you KNOW that there are not going to be any third level nodes. Not HierarchicalDataTemplate, but TreeViewItem template. While neither of the pages specifically say what to do, you are essentially changing the layout properties in the items presenter. I have also found this one to be pretty good to start out with. The following page, has a pretty good high level view of editing the Hierarchical Data Template. Really what you want to do is edit the HierarchicalDataTemplate and change the way it behaves.
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