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POCan I get the behavior of setting my WinForms form's owner using an hwnd / NativeWindow?
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copied!<p>My application is a vb6 executable, but some newer forms in the system are written in C#. I would like to be able to set the C# form's Owner property using a handle to the main application window, so that the dialogs remain on top when tabbing back and forth between my app and other apps.</p> <p>I can get the hwnd of the main application window. I'm not sure what I can do from there?</p> <hr> <p><strong>UPDATE Oct 20 '08 at 17:06:</strong> </p> <p>Scott,</p> <p>Thanks for the response. I had overlooked that the Show/ShowDialog method parameter was not of type Form - I was looking only at the Owner property.</p> <p>I slightly modified the code I'm using from the above - we have a component that generically loads our Forms and calls ShowDialog. My code looks like this:</p> <pre><code>Form launchTarget = FormFactory.GetForm(xxx); // psuedo-code for generic form loader launchTarget.StartPosition = FormStartPosition.CenterParent; IWin32Window parentWindow = GetWindowFromHwnd(hwnd); launchTarget.ShowDialog(parentWindow); </code></pre> <p><code>GetWindowFromHwnd</code> is a method-wrapped version of your code:</p> <pre><code>private IWin32Window GetWindowFromHost(int hwnd) { IWin32Window window = null; IntPtr handle = new IntPtr(hwnd); try { NativeWindow nativeWindow = new NativeWindow(); nativeWindow.AssignHandle(handle); window = nativeWindow; } finally { handle = IntPtr.Zero; } return window; } </code></pre> <p>Unfortunately this isn't doing what I'd hoped. The form does display modally, but it's not showing up in the correct position nor is it still on top when I tab away and back to the parent window. Our modals do not show a task in the taskbar, so the window seemingly "disappears" (although it is still present in the alt-tab window list). That to me indicates I might not have the right hwnd. If you have any other suggestions though, please reply back. Thanks again.</p> <hr> <p><strong>UPDATE Nov 10 '08 at 16:25</strong> </p> <p>One follow up remark - If you factor it out into a method call in a try/finally, as in Scott's 2nd post, the call in the finally block should be:</p> <pre><code>parentWindow.ReleaseHandle(); </code></pre>

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