扩展C#中对话框

来源：互联网发布：域名模糊查询编辑：程序博客网时间：2024/06/01 13:45
问题

在WinForm中，使用MessageBox时，总是显示在桌面中心，如何显示在winform的中心呢？
这个需要扩展MessageBox了，使用window hook。
实现

    using System;      using System.Windows.Forms;      using System.Text;      using System.Drawing;      using System.Runtime.InteropServices;      namespace UIEx {    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);          }      }}
使用

使用时和MessageBox一样的用法。
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