C# WinForm调用Shell_NotifyIcon

    public class InnerClass: Form
    {
        private Shell_NotifyIconEx servicesClass = null; // 接受主CLASS 的实例句柄
        internal InnerClass(Shell_NotifyIconEx _servicesClass)
        {
            servicesClass = _servicesClass;
        }

        private const int WM_LBUTTONDOWN = 0x0201; // 左键
        private const int WM_RBUTTONDOWN = 0x204; // 右键
        private const int WM_MBUTTONDOWN = 0x207; // 中键

        [DllImport("user32.dll", EntryPoint = "TrackPopupMenu")]
        private static extern int TrackPopupMenu( // c# 和vb.net 好象没有了随地popup 了，只要请它老人家出马了
         IntPtr hMenu,
         int wFlags,
         int x,
         int y,
         int nReserved,
         IntPtr hwnd,
         ref RECT lprc
         );

        [StructLayout(LayoutKind.Sequential)]
        private struct RECT
        { // 上面那位用的结构，表示前弹出菜单可用的一个范围大小（一般是全屏幕都让它用，留着搞游戏或视频对话之类的朋友指定菜单可用的范围）
            internal int Left;
            internal int Top;
            internal int Right;
            internal int Bottom;
        }

        protected override void WndProc(ref Message msg)
        {
            if (msg.Msg == servicesClass.WM_NOTIFY_TRAY)
            { // 如果消息相符
                if ((int)msg.WParam == servicesClass.uID)
                { // 并且消息的WParam 相符
                   MouseButtons mb =MouseButtons.None;
                    if ((int)msg.LParam == WM_LBUTTONDOWN)
                    { //如果点击的是左键
                        mb =MouseButtons.Left;
                    }
                    else if ((int)msg.LParam == WM_MBUTTONDOWN)
                    { //中键
                        mb =MouseButtons.Middle;
                    }
                    else if ((int)msg.LParam == WM_RBUTTONDOWN)
                    { //右键
                        if (servicesClass.contextMenuHwnd != IntPtr.Zero)
                        { //如果有定义过菜单关联
                            RECT r = new RECT();
                            r.Left = Screen.PrimaryScreen.WorkingArea.Left;
                            r.Right =Screen.PrimaryScreen.WorkingArea.Right;
                            r.Top =Screen.PrimaryScreen.WorkingArea.Top;
                            r.Bottom =Screen.PrimaryScreen.WorkingArea.Right;

                            TrackPopupMenu(
                             servicesClass.contextMenuHwnd,
                             2,
                            Cursor.Position.X,
                            Cursor.Position.Y,
                             0,
                             servicesClass.formHwnd,
                             ref r
                             );
                        }
                        else
                        { //如果没有定义过菜单关联
                            mb =MouseButtons.Right;
                        }
                    }

                    if (mb !=MouseButtons.None && servicesClass._delegateOfCallBack != null)
                    {
                        servicesClass._delegateOfCallBack(mb); // 执行回调
                        return;
                    }
                }
            }

            base.WndProc(ref msg);
        }
    }

public class Shell_NotifyIconEx
    {
        /// <summary>
        /// ArLi, last fix: 2003.9.12, reference: ArLi.CommonPrj Lib @ http://zpcity.com/arli/
        /// </summary>
        public static readonly System.Version myVersion = new System.Version(1, 2); //版本声明

        private readonly InnerClass formTmp = null; // 这个很重要，不能放在构造里，因为它必须和此实例同等生存期才不会被中止消息循环
        private readonly IntPtr formTmpHwnd = IntPtr.Zero; // 这是上一行的句柄
        private readonly bool VersionOk = false; // 这是一个由VersionPass 返回的属性，它允许开发者检测当前机子的Shell32.dll(可能在win95 或未知平台上版本) 合适此组，不符则用.net 自己的notifyicon
        private bool forgetDelNotifyBox = false; // 这是一个私有标志，它允许开发者在程序退出时忘记调用DelNotifyBox 来清除图标时会自动在析构里清掉它。

        internal IntPtr formHwnd = IntPtr.Zero; // 这是调用此组件的主窗口句柄（当前实例有效，可多个icon 不冲突）
        internal IntPtr contextMenuHwnd = IntPtr.Zero; // 这是菜单的句柄（当前实例有效，可多个icon 不冲突）

        internal delegate void delegateOfCallBack(System.Windows.Forms.MouseButtons mb);
        internal delegateOfCallBack _delegateOfCallBack = null;

        public Shell_NotifyIconEx() // 构造
        {
            WM_NOTIFY_TRAY += 1; // 消息ID +1，避免多个ICON 消息处理冲突
            uID += 1; // 同上
            formTmp = new InnerClass(this); // 新实例一个消息循环
            formTmpHwnd = formTmp.Handle; // 新实例句柄
            VersionOk = this.GetShell32VersionInfo() >= 5; // 版本是否合适，此组件由于重点在气泡提示，它要求Shell32.dll 5.0(ie 5.0) 以上
        }

        ~Shell_NotifyIconEx()
        { // 析构
            if (forgetDelNotifyBox) this.DelNotifyBox(); //如果开发者忘记则清理icon
        }

        #region API_Consts
        internal readonly int WM_NOTIFY_TRAY = 0x0400 + 2001; //readonly 表示只在构造可付值
        internal readonly int uID = 5000;

        // 常数定义，有VC 的可以参见 shellapi.h
        private const int NIIF_NONE = 0x00;
        private const int NIIF_INFO = 0x01;
        private const int NIIF_WARNING = 0x02;
        private const int NIIF_ERROR = 0x03;

        private const int NIF_MESSAGE = 0x01;
        private const int NIF_ICON = 0x02;
        private const int NIF_TIP = 0x04;
        private const int NIF_STATE = 0x08;
        private const int NIF_INFO = 0x10;

        private const int NIM_ADD = 0x00;
        private const int NIM_MODIFY = 0x01;
        private const int NIM_DELETE = 0x02;
        private const int NIM_SETFOCUS = 0x03;
        private const int NIM_SETVERSION = 0x04;

        private const int NIS_HIDDEN = 0x01;
        private const int NIS_SHAREDICON = 0x02;

        private const int NOTIFYICON_OLDVERSION = 0x00;
        private const int NOTIFYICON_VERSION = 0x03;

        [DllImport("shell32.dll", EntryPoint = "Shell_NotifyIcon")]
        private static extern bool Shell_NotifyIcon( // 这位是主角
            int dwMessage,
            ref NOTIFYICONDATA lpData
        );

        /// <summary>
        /// 此API 的作用是当 this.focus() 无效时可以考虑使用，效果很好
        /// </summary>
        /// <param name="hwnd">this.Handle, 当前窗体句柄</param>
        [DllImport("user32.dll", EntryPoint = "SetForegroundWindow")]
        public static extern int SetForegroundWindow(
            IntPtr hwnd
        );

        [StructLayout(LayoutKind.Sequential)]
        private struct NOTIFYICONDATA
        { // 主角用的结构
            internal int cbSize;
            internal IntPtr hwnd;
            internal int uID;
            internal int uFlags;
            internal int uCallbackMessage;
            internal IntPtr hIcon;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x80)]
            internal string szTip;
            internal int dwState; // 这里往下几个是 5.0 的精华
            internal int dwStateMask;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0xFF)]
            internal string szInfo;
            internal int uTimeoutAndVersion;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x40)]
            internal string szInfoTitle;
            internal int dwInfoFlags;
        }
        #endregion

        /// <summary>
        /// 建一个结构
        /// </summary>
        private NOTIFYICONDATA GetNOTIFYICONDATA(IntPtr iconHwnd, string sTip, string boxTitle, string boxText)
        {
            NOTIFYICONDATA nData = new NOTIFYICONDATA();

            nData.cbSize = System.Runtime.InteropServices.Marshal.SizeOf(nData); // 结构的大小
            nData.hwnd = formTmpHwnd; // 处理消息循环的窗体句柄，可以移成主窗体
            nData.uID = uID; // 消息的 WParam，回调时用
            nData.uFlags = NIF_MESSAGE | NIF_ICON | NIF_TIP | NIF_INFO; // 标志，表示由消息、图标、提示、信息组成
            nData.uCallbackMessage = WM_NOTIFY_TRAY; // 消息ID，回调用
            nData.hIcon = iconHwnd; // 图标的句柄，有兴趣的话可以定时改变它变成动画ICON
            nData.uTimeoutAndVersion = 10 * 1000 | NOTIFYICON_VERSION; // 提示的超时值（几秒后自动消失）和版本
            nData.dwInfoFlags = NIIF_INFO; // 类型标志，有INFO、WARNING、ERROR，更改此值将影响气泡提示框的图标类型

            nData.szTip = sTip; // 图标的提示信息
            nData.szInfoTitle = boxTitle; // 气泡提示框的标题
            nData.szInfo = boxText; // 气泡提示框的提示内容

            return nData; // 这个嘛。。。
        }

        private int GetShell32VersionInfo()
        { // 返回shell32 的版本
            FileInfo fi = new FileInfo(Path.Combine(System.Environment.SystemDirectory, "shell32.dll")); //将来的平台shell32 放哪目前不得而知，碰到再改
            if (fi.Exists)
            {
                FileVersionInfo theVersion = FileVersionInfo.GetVersionInfo(fi.FullName);
                int i = theVersion.FileVersion.IndexOf('.');
                if (i > 0)
                {
                    try
                    {
                        return int.Parse(theVersion.FileVersion.Substring(0, i));
                    }
                    catch { }
                }
            }
            return 0;
        }

        /// <summary>
        /// 加一个新图标
        /// </summary>
        /// <param name="iconHwnd">图标句柄</param>
        /// <param name="sTip">提示, 5.0 最大: 128 char</param>
        /// <param name="boxTitle">气泡标题, 最大: 64 char</param>
        /// <param name="boxText">气泡内容, 最大: 256 char</param>
        /// <returns>成功、失败或错误(-1)</returns>
        public int AddNotifyBox(IntPtr iconHwnd, string sTip, string boxTitle, string boxText)
        {
            if (!this.VersionOk) return -1;

            NOTIFYICONDATA nData = GetNOTIFYICONDATA(iconHwnd, sTip, boxTitle, boxText);
            if (Shell_NotifyIcon(NIM_ADD, ref nData))
            {
                this.forgetDelNotifyBox = true;
                return 1;
            }
            else
            {
                return 0;
            }
        }

        /// <summary>
        /// 和add 差不多，不重复了
        /// </summary>
        public int DelNotifyBox()
        {
            if (!this.VersionOk) return -1;

            NOTIFYICONDATA nData = GetNOTIFYICONDATA(IntPtr.Zero, null, null, null);
            if (Shell_NotifyIcon(NIM_DELETE, ref nData))
            {
                this.forgetDelNotifyBox = false;
                return 1;
            }
            else
            {
                return 0;
            }
        }

        public int ModiNotifyBox(IntPtr iconHwnd, string sTip, string boxTitle, string boxText)
        {
            if (!this.VersionOk) return -1;

            NOTIFYICONDATA nData = GetNOTIFYICONDATA(iconHwnd, sTip, boxTitle, boxText);
            return Shell_NotifyIcon(NIM_MODIFY, ref nData) ? 1 : 0;
        }

        #region Optional Module //这里是可选方法
        /// <summary>
        /// 连接一个已存在的 contextMenu
        /// </summary>
        /// <param name="_formHwnd">窗体句柄，用来处理菜单的消息</param>
        /// <param name="_contextMenuHwnd">菜单的句柄</param>
        public void ConnectMyMenu(IntPtr _formHwnd, IntPtr _contextMenuHwnd)
        {
            formHwnd = _formHwnd;
            contextMenuHwnd = _contextMenuHwnd;
        }

        /// <summary>
        /// 立即清理掉图标、委托和formtmp 资源（好象没什么资源，考虑到可能二次开发挂接就开了这个东东）
        /// </summary>
        public void Dispose()
        {
            _delegateOfCallBack = null;
            this.formTmp.Dispose();
        }

        /// <summary>
        /// 版本适合
        /// </summary>
        public bool VersionPass
        {
            get
            {
                return this.VersionOk;
            }
        }
        #endregion
    }

用法示例:

private void button2_Click (object sender, System.EventArgs e) {
    Shell_NotifyIconEx ().AddNotifyBox (this.Icon.Handle, this.Text, "这是标题", "单击这里开始，我将带你畅游API 世界");
}

private void GetPoc1 (MouseButtons mb) { // 回调处理
    if (mb == MouseButtons.Left) {
        MessageBox.Show ("来自菜单1");
    }
}
privateShell_NotifyIconEx o1 = newShell_NotifyIconEx (); //这个放外面是用在 o.DelNotifyBox
private void button1_Click (object sender, System.EventArgs e) {
    o1.AddNotifyBox (this.Icon.Handle, this.Text, "菜单1", "单击这里开始，我将带你畅游API 世界");
    o1.ConnectMyMenu (this.Handle, this.contextMenu1.Handle); // 挂上菜单，可选
    o1._delegateOfCallBack = newShell_NotifyIconEx.delegateOfCallBack (GetPoc1); //定义回调
}

private void GetPoc1(MouseButtons mb) { // 回调处理
   if (mb == MouseButtons.Left) {
    MessageBox.Show("来自菜单1");
   }
  }
  private Shell_NotifyIconEx o1 = new Shell_NotifyIconEx(); //这个放外面是用在 o.DelNotifyBox
  private void button1_Click(object sender, System.EventArgs e) {
   o1.AddNotifyBox(this.Icon.Handle,this.Text,"菜单1","单击这里开始，我将带你畅游API 世界");   
   o1.ConnectMyMenu(this.Handle,this.contextMenu1.Handle); // 挂上菜单，可选
   o1._delegateOfCallBack = new Shell_NotifyIconEx.delegateOfCallBack(GetPoc1); //定义回调
  }
  private void GetPoc2(MouseButtons mb) {
   if (mb == MouseButtons.Left) {
    MessageBox.Show("来自菜单2");
   }
  }
  private Shell_NotifyIconEx o2 = new Shell_NotifyIconEx(); //第二个nofityicon 和上面一样
  private void button2_Click(object sender, System.EventArgs e) {
   o2.AddNotifyBox(this.Icon.Handle,this.Text,"菜单2","单击这里开始，我将带你畅游API 世界");   
   o2.ConnectMyMenu(this.Handle,this.contextMenu2.Handle);
   o2._delegateOfCallBack = new Shell_NotifyIconEx.delegateOfCallBack(GetPoc2);
  }

本文来自：http://blog.sina.com.cn/s/blog_6c0affba0100pi0e.html