把WPF Dialog转成WinForm Dialog需要注意的问题续

上一篇讲到将WPF的窗口转为WinForm窗口需要注意的问题，这里给出了另一种解决方案，闲话不说，请看代码：

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//============================================================================== //  File Name   :   WpfModalDialogFixer.cs // //  Copyright (C) 2010 GrapeCity Inc. All rights reserved. // //  Distributable under LGPL license. // //==============================================================================   // <fileinformation> //   <summary> //     This file defines the class WpfModalDialogFixer for solve the problem as below: //     When showing a modal dialog which ShowTaskBar is false, first deactive the application the activate it again. //     The modal dialog would be at behind of MainWindow. //   </summary> //   <author name="WinkingZhang" mail="Winking.Zhang@GrapeCity.com"/> //   <seealso ref=""/> //   <remarks> //     //   </remarks> // </fileinformation>   // <history> //   <record date="10/21/2010 6:07:04 PM" author="WinkingZhang" revision="1.00.000"> //     Create the file and define the class. //   </record> // </history>   using System; using System.Threading; using System.Windows; using System.Windows.Interop; using System.Runtime.InteropServices;   namespace GrapeCity.Windows {     /// <summary>     ///   Represents the <see cref="WpfModalDialogFixer"/> class.     /// </summary>     public class WpfModalDialogFixer     {         [ThreadStatic]         private static WpfModalDialogFixer _fixer;         private static readonly object _rootSync = new object();           static WpfModalDialogFixer()         {             ComponentDispatcher.EnterThreadModal += new EventHandler(OnComponentDispatcherEnterThreadModal);             ComponentDispatcher.LeaveThreadModal += new EventHandler(OnComponentDispatcherLeaveThreadModal);         }           private WpfModalDialogFixer()         {         }           static void OnComponentDispatcherLeaveThreadModal(object sender, EventArgs e)         {             if (WpfModalDialogFixer.Current.Enable)             {                 HwndSource src = HwndSource.FromVisual(Application.Current.MainWindow) as HwndSource;                 if (src != null)                 {                     src.RemoveHook(new HwndSourceHook(OnComponentDispatcherThreadPreprocessMessage));                 }             }         }           static IntPtr OnComponentDispatcherThreadPreprocessMessage(IntPtr hwnd, int message, IntPtr wparam, IntPtr lparam, ref bool handled)         {             // Need take care the message: WM_SETFOCUS, and if now in Modal dialog mode.             if (message == 0x7 && ComponentDispatcher.IsThreadModal)             {                 bool actived = false;                 foreach (Window w in Application.Current.Windows)                 {                     HwndSource src = HwndSource.FromVisual(w) as HwndSource;                     if (src != null /*&& src.Handle != hwnd*/)                     {                         if (IsWindowEnabled(src.Handle))                         {                             w.Activate();                             actived = true;                             break;                         }                     }                 }                 if (!actived) // in this case, caused by MessageBox.Show(...)                 {                     //TODO: how to handle?                 }                 handled = true; // set handled to prevent default implement.             }             return IntPtr.Zero;         }           static void OnComponentDispatcherEnterThreadModal(object sender, EventArgs e)         {             if (WpfModalDialogFixer.Current.Enable)             {                 HwndSource src = HwndSource.FromVisual(Application.Current.MainWindow) as HwndSource;                 if (src != null)                 {                     src.AddHook(new HwndSourceHook(OnComponentDispatcherThreadPreprocessMessage));                 }             }         }           [DllImport("user32.dll")]         [return: MarshalAs(UnmanagedType.Bool)]         private static extern bool IsWindowEnabled(IntPtr hwnd);           public static WpfModalDialogFixer Current         {             get             {                 if (_fixer == null)                 {                     lock (_rootSync)                     {                         if (_fixer == null)                         {                             _fixer = new WpfModalDialogFixer();                         }                     }                 }                 return _fixer;             }         }           public bool Enable         {             get;             set;         }     } }