1、托盘显示的标题、内容、图标等信息在界面设置。

2、后台代码

public partial class Form1 : Form     {
   public Form1()         {
               InitializeComponent();         } private void Form1_FormClosing(object sender, FormClosingEventArgs e)         {
   if (this.Visible == true)             {
                   e.Cancel = true; this.Visible = false;             }         } private void notifyIcon1_MouseClick(object sender, MouseEventArgs e)         {
   if (e.Button == MouseButtons.Left)             {
   this.Visible = true; this.WindowState = FormWindowState.Normal;             }         } private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)         {
   this.Visible = false;             Application.Exit();         }     }

修改Program.cs

static class Program {
       [DllImport("user32.dll")] public static extern IntPtr FindWindow(string lpClassName, string lpWindowName);     [DllImport("user32.dll ")] static extern void SwitchToThisWindow(IntPtr hWnd, bool fAltTab);     [DllImport("User32.dll")] private static extern bool SetForegroundWindow(IntPtr hWnd);     [DllImport("User32.dll")] private static extern bool ShowWindowAsync(IntPtr hWnd, int cmdShow); public static IntPtr formhwnd; /// 
 /// 应用程序的主入口点。 /// 
     [STAThread] static void Main()     {
           Application.EnableVisualStyles();         Application.SetCompatibleTextRenderingDefault(false); bool createdNew;         Mutex mutex = new Mutex(false, "Notify", out createdNew); if (!createdNew)         {
               Process instance;             Process currentProcess = Process.GetCurrentProcess();             Process[] process = Process.GetProcessesByName(currentProcess.ProcessName); for (int i = 0; i < process.Length; i++)             {
   if (process[i].Id != currentProcess.Id)                 {
                       instance = process[i]; if (instance.MainWindowHandle != IntPtr.Zero)                     {
                           SwitchToThisWindow(instance.MainWindowHandle, true);                     } else                     {
                           formhwnd = FindWindow(null, "Form1");                         ShowWindowAsync(formhwnd, 1);                         SetForegroundWindow(formhwnd);                     } return;                 }             }         }         Form1 form = new Form1();         Application.Run(form);     } }