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    <p>I made this class based on a class for Windows Forms which I found somwehere else.</p> <p>Just add the class to your WPF project and provide "this" as a parameter to the helper method like this: </p> <pre><code> MessageBoxHelper.PrepToCenterMessageBoxOnForm(this)" </code></pre> <p>Then show the message box:</p> <pre><code>MessageBox.Show("Hello there!"); /// &lt;summary&gt; /// This class makes it possible to center a MessageBox over the parent dialog. /// Usage example: /// MessageBoxHelper.PrepToCenterMessageBoxOnForm(this); /// MessageBox.Show("Hello there!); /// &lt;/summary&gt; public static class MessageBoxHelper { public static void PrepToCenterMessageBoxOnForm(Window window) { MessageBoxCenterHelper helper = new MessageBoxCenterHelper(); helper.Prep(window); } private class MessageBoxCenterHelper { private int messageHook; private IntPtr parentFormHandle; public void Prep(Window window) { NativeMethods.CenterMessageCallBackDelegate callBackDelegate = new NativeMethods.CenterMessageCallBackDelegate(CenterMessageCallBack); GCHandle.Alloc(callBackDelegate); parentFormHandle = new WindowInteropHelper(window).Handle; messageHook = NativeMethods.SetWindowsHookEx(5, callBackDelegate, new IntPtr(NativeMethods.GetWindowLong(parentFormHandle, -6)), NativeMethods.GetCurrentThreadId()).ToInt32(); } private int CenterMessageCallBack(int message, int wParam, int lParam) { NativeMethods.RECT formRect; NativeMethods.RECT messageBoxRect; int xPos; int yPos; if (message == 5) { NativeMethods.GetWindowRect(parentFormHandle, out formRect); NativeMethods.GetWindowRect(new IntPtr(wParam), out messageBoxRect); xPos = (int)((formRect.Left + (formRect.Right - formRect.Left) / 2) - ((messageBoxRect.Right - messageBoxRect.Left) / 2)); yPos = (int)((formRect.Top + (formRect.Bottom - formRect.Top) / 2) - ((messageBoxRect.Bottom - messageBoxRect.Top) / 2)); NativeMethods.SetWindowPos(wParam, 0, xPos, yPos, 0, 0, 0x1 | 0x4 | 0x10); NativeMethods.UnhookWindowsHookEx(messageHook); } return 0; } } private static class NativeMethods { internal struct RECT { public int Left; public int Top; public int Right; public int Bottom; } internal delegate int CenterMessageCallBackDelegate(int message, int wParam, int lParam); [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] internal static extern bool UnhookWindowsHookEx(int hhk); [DllImport("user32.dll", SetLastError = true)] internal static extern int GetWindowLong(IntPtr hWnd, int nIndex); [DllImport("kernel32.dll")] internal static extern int GetCurrentThreadId(); [DllImport("user32.dll", SetLastError = true)] internal static extern IntPtr SetWindowsHookEx(int hook, CenterMessageCallBackDelegate callback, IntPtr hMod, int dwThreadId); [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] internal static extern bool SetWindowPos(int hWnd, int hWndInsertAfter, int X, int Y, int cx, int cy, int uFlags); [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] internal static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect); } } </code></pre>
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    1. USAH.
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    1. COYou forgot to say *where* you stole this code from. Attribution is important here. A Google search turns up a couple of possible sources: http://www.jasoncarr.com/technology/centering-a-message-box-on-the-active-window-in-csharp, http://code.google.com/p/lioneditor/source/browse/branches/imageEditorv2/FFTPatcher/PatcherLib/MyMessageBox.cs?spec=svn468&r=468.
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    2. COGood idea. But please mind your words : "stole" that is a harsh expression. I explictly said "found somwhere else", but you are absolutely right about attribution.
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    3. COAnd no, the original code did not come frome the link you added. It came from Jason Carr: http://www.jasoncarr.com/technology/centering-a-message-box-on-the-active-window-in-csharp. I just modified it to work in WPF. Thanks Jason.
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