.Net下Winform程序让MessageBox.Show显示在父窗体中间

 using System;
 using System.Windows.Forms;
 using System.Text;
 using System.Drawing;
 using System.Runtime.InteropServices;


 public class MessageBoxEx
 {
     private static IWin32Window _owner;
     private static HookProc _hookProc;
     private static IntPtr _hHook;

     public static DialogResult Show(string text)
     {
         Initialize();
         return MessageBox.Show(text);
     }

     public static DialogResult Show(string text, string caption)
     {
         Initialize();
         return MessageBox.Show(text, caption);
     }

     public static DialogResult Show(string text, string caption, MessageBoxButtons buttons)
     {
         Initialize();
         return MessageBox.Show(text, caption, buttons);
     }

     public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)
     {
         Initialize();
         return MessageBox.Show(text, caption, buttons, icon);
     }

     public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton)
     {
         Initialize();
         return MessageBox.Show(text, caption, buttons, icon, defButton);
     }

     public static DialogResult Show(string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, MessageBoxOptions options)
     {
         Initialize();
         return MessageBox.Show(text, caption, buttons, icon, defButton, options);
     }

     public static DialogResult Show(IWin32Window owner, string text)
     {
         _owner = owner;
         Initialize();
         return MessageBox.Show(owner, text);
     }

     public static DialogResult Show(IWin32Window owner, string text, string caption)
     {
         _owner = owner;
         Initialize();
         return MessageBox.Show(owner, text, caption);
     }

     public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons)
     {
         _owner = owner;
         Initialize();
         return MessageBox.Show(owner, text, caption, buttons);
     }

     public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon)
     {
         _owner = owner;
         Initialize();
         return MessageBox.Show(owner, text, caption, buttons, icon);
     }

     public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton)
     {
         _owner = owner;
         Initialize();
         return MessageBox.Show(owner, text, caption, buttons, icon, defButton);
     }

     public static DialogResult Show(IWin32Window owner, string text, string caption, MessageBoxButtons buttons, MessageBoxIcon icon, MessageBoxDefaultButton defButton, MessageBoxOptions options)
     {
         _owner = owner;
         Initialize();
         return MessageBox.Show(owner, text, caption, buttons, icon,
                                defButton, options);
     }

     public delegate IntPtr HookProc(int nCode, IntPtr wParam, IntPtr lParam);

     public delegate void TimerProc(IntPtr hWnd, uint uMsg, UIntPtr nIDEvent, uint dwTime);

     public const int WH_CALLWNDPROCRET = 12;

     public enum CbtHookAction : int
     {
         HCBT_MOVESIZE = 0,
         HCBT_MINMAX = 1,
         HCBT_QS = 2,
         HCBT_CREATEWND = 3,
         HCBT_DESTROYWND = 4,
         HCBT_ACTIVATE = 5,
         HCBT_CLICKSKIPPED = 6,
         HCBT_KEYSKIPPED = 7,
         HCBT_SYSCOMMAND = 8,
         HCBT_SETFOCUS = 9
     }

     [DllImport("user32.dll")]
     private static extern bool GetWindowRect(IntPtr hWnd, ref Rectangle lpRect);

     [DllImport("user32.dll")]
     private static extern int MoveWindow(IntPtr hWnd, int X, int Y, int nWidth, int nHeight, bool bRepaint);

     [DllImport("User32.dll")]
     public static extern UIntPtr SetTimer(IntPtr hWnd, UIntPtr nIDEvent, uint uElapse, TimerProc lpTimerFunc);

     [DllImport("User32.dll")]
     public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

     [DllImport("user32.dll")]
     public static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);

     [DllImport("user32.dll")]
     public static extern int UnhookWindowsHookEx(IntPtr idHook);

     [DllImport("user32.dll")]
     public static extern IntPtr CallNextHookEx(IntPtr idHook, int nCode, IntPtr wParam, IntPtr lParam);

     [DllImport("user32.dll")]
     public static extern int GetWindowTextLength(IntPtr hWnd);

     [DllImport("user32.dll")]
     public static extern int GetWindowText(IntPtr hWnd, StringBuilder text, int maxLength);

     [DllImport("user32.dll")]
     public static extern int EndDialog(IntPtr hDlg, IntPtr nResult);

     [StructLayout(LayoutKind.Sequential)]
     public struct CWPRETSTRUCT
     {
         public IntPtr lResult;
         public IntPtr lParam;
         public IntPtr wParam;
         public uint message;
         public IntPtr hwnd;
     } ;

     static MessageBoxEx()
     {
         _hookProc = new HookProc(MessageBoxHookProc);
         _hHook = IntPtr.Zero;
     }

     private static void Initialize()
     {
         if (_hHook != IntPtr.Zero)
         {
             throw new NotSupportedException("multiple calls are not supported");
         }

         if (_owner != null)
         {
             _hHook = SetWindowsHookEx(WH_CALLWNDPROCRET, _hookProc, IntPtr.Zero, AppDomain.GetCurrentThreadId());
         }
     }

     private static IntPtr MessageBoxHookProc(int nCode, IntPtr wParam, IntPtr lParam)
     {
         if (nCode < 0)
         {
             return CallNextHookEx(_hHook, nCode, wParam, lParam);
         }

         CWPRETSTRUCT msg = (CWPRETSTRUCT)Marshal.PtrToStructure(lParam, typeof(CWPRETSTRUCT));
         IntPtr hook = _hHook;

         if (msg.message == (int)CbtHookAction.HCBT_ACTIVATE)
         {
             try
             {
                 CenterWindow(msg.hwnd);
             }
             finally
             {
                 UnhookWindowsHookEx(_hHook);
                 _hHook = IntPtr.Zero;
             }
         }

         return CallNextHookEx(hook, nCode, wParam, lParam);
     }

     private static void CenterWindow(IntPtr hChildWnd)
     {
         Rectangle recChild = new Rectangle(0, 0, 0, 0);
         bool success = GetWindowRect(hChildWnd, ref recChild);

         int width = recChild.Width - recChild.X;
         int height = recChild.Height - recChild.Y;

         Rectangle recParent = new Rectangle(0, 0, 0, 0);
         success = GetWindowRect(_owner.Handle, ref recParent);

         Point ptCenter = new Point(0, 0);
         ptCenter.X = recParent.X + ((recParent.Width - recParent.X) / 2);
         ptCenter.Y = recParent.Y + ((recParent.Height - recParent.Y) / 2);

         Point ptStart = new Point(0, 0);
         ptStart.X = (ptCenter.X - (width / 2));
         ptStart.Y = (ptCenter.Y - (height / 2));

         ptStart.X = (ptStart.X < 0) ? 0 : ptStart.X;
         ptStart.Y = (ptStart.Y < 0) ? 0 : ptStart.Y;

         int result = MoveWindow(hChildWnd, ptStart.X, ptStart.Y, width, height, false);
     }
 }

 调用方式：

 DialogResult dr = MessageBoxEx.Show(this,"是否要删除此数据？", "删除确认", MessageBoxButtons.OKCancel, MessageBoxIcon.Information, MessageBoxDefaultButton.Button2);

 if (dr == DialogResult.Cancel)
 {
     return;
 }

转自：http://blog.csdn.net/aspnet2002web/article/details/28173289