c# winform 窗體失去焦點關閉（鈎子實現）

先來一個輔助類

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Windows.Forms;

namespace HZCX.Utils
{
    /// <summary>
    /// 鼠標全局鈎子
    /// </summary>
    public static class MouseHook
    {
        private const int WM_MOUSEMOVE = 0x200;
        private const int WM_LBUTTONDOWN = 0x201;
        private const int WM_RBUTTONDOWN = 0x204;
        private const int WM_MBUTTONDOWN = 0x207;
        private const int WM_LBUTTONUP = 0x202;
        private const int WM_RBUTTONUP = 0x205;
        private const int WM_MBUTTONUP = 0x208;
        private const int WM_LBUTTONDBLCLK = 0x203;
        private const int WM_RBUTTONDBLCLK = 0x206;
        private const int WM_MBUTTONDBLCLK = 0x209;

        /// <summary>
        /// 點
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        public class POINT
        {
            public int x;
            public int y;
        }

        /// <summary>
        /// 鈎子結構體
        /// </summary>
        [StructLayout(LayoutKind.Sequential)]
        public class MouseHookStruct
        {
            public POINT pt;
            public int hWnd;
            public int wHitTestCode;
            public int dwExtraInfo;
        }

        public const int WH_MOUSE_LL = 14; // mouse hook constant

        // 裝置鈎子的函數
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);

        // 卸下鈎子的函數
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern bool UnhookWindowsHookEx(int idHook);

        // 下一個鈎掛的函數
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);

        // 全局的鼠標事件
        public static event MouseEventHandler OnMouseActivity;

        // 鈎子回調函數
        public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);

        // 聲明鼠標鈎子事件類型
        private static HookProc _mouseHookProcedure;
        private static int _hMouseHook = 0; // 鼠標鈎子句柄
        /// <summary>
        /// 啟動全局鈎子
        /// </summary>
        public static void Start()
        {
            // 安裝鼠標鈎子
            if (_hMouseHook != 0)
            {
                Stop();
            }
            // 生成一個HookProc的實例.
            _mouseHookProcedure = new HookProc(MouseHookProc);

            _hMouseHook = SetWindowsHookEx(WH_MOUSE_LL, _mouseHookProcedure, Marshal.GetHINSTANCE(System.Reflection.Assembly.GetEntryAssembly().GetModules()[0]), 0);

            //假設裝置失敗停止鈎子
            if (_hMouseHook == 0)
            {
                Stop();
                throw new Exception("SetWindowsHookEx failed.");
            }
        }

        /// <summary>
        /// 停止全局鈎子
        /// </summary>
        public static void Stop()
        {
            bool retMouse = true;

            if (_hMouseHook != 0)
            {
                retMouse = UnhookWindowsHookEx(_hMouseHook);
                _hMouseHook = 0;
            }

            // 假設卸下鈎子失敗
            if (!(retMouse))
                throw new Exception("UnhookWindowsHookEx failed.");
        }

        /// <summary>
        /// 鼠標鈎子回調函數
        /// </summary>
        private static int MouseHookProc(int nCode, Int32 wParam, IntPtr lParam)
        {
            // 假設正常執行而且用戶要監聽鼠標的消息
            if ((nCode >= 0) && (OnMouseActivity != null))
            {
                MouseButtons button = MouseButtons.None;
                int clickCount = 0;

                switch (wParam)
                {
                    case WM_LBUTTONDOWN:
                        button = MouseButtons.Left;
                        clickCount = 1;
                        break;
                    case WM_LBUTTONUP:
                        button = MouseButtons.Left;
                        clickCount = 1;
                        break;
                    case WM_LBUTTONDBLCLK:
                        button = MouseButtons.Left;
                        clickCount = 2;
                        break;
                    case WM_RBUTTONDOWN:
                        button = MouseButtons.Right;
                        clickCount = 1;
                        break;
                    case WM_RBUTTONUP:
                        button = MouseButtons.Right;
                        clickCount = 1;
                        break;
                    case WM_RBUTTONDBLCLK:
                        button = MouseButtons.Right;
                        clickCount = 2;
                        break;
                }
                if (button != MouseButtons.None && clickCount>0)
                {
                    // 從回調函數中得到鼠標的信息
                    MouseHookStruct MyMouseHookStruct = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));
                    MouseEventArgs e = new MouseEventArgs(button, clickCount, MyMouseHookStruct.pt.x, MyMouseHookStruct.pt.y, 0);                  
                    OnMouseActivity(null, e);
                }
            }

            // 啟動下一次鈎子
            int inext = CallNextHookEx(_hMouseHook, nCode, wParam, lParam);
            return inext;
        }
    }
}

Program的main函數里面調用 MouseHook.Start();

main函數里面寫 Application.ApplicationExit += Application_ApplicationExit;

static void Application_ApplicationExit(object sender, EventArgs e)
{
MouseHook.Stop();
}

 

窗體load里面寫 HZCX.Utils.MouseHook.OnMouseActivity += hook_OnMouseActivity;

窗體closing里面寫 HZCX.Utils.MouseHook.OnMouseActivity -= hook_OnMouseActivity;

 void hook_OnMouseActivity(object sender, MouseEventArgs e)
        {
            try
            {
                if (this._isLoseFocusClose && e.Clicks > 0)
                {
                    if (e.Button == System.Windows.Forms.MouseButtons.Left || e.Button == System.Windows.Forms.MouseButtons.Right)
                    {
                        if (!this.IsDisposed)
                        {
                            if (!this.ClientRectangle.Contains(this.PointToClient(e.Location)))
                            {
                                base.Close();
                            }
                        }
                    }
                }
            }
            catch { }
        }

就這樣了