C# Winform程序实现防止多开的方法总结【亲测】

static class Program
  {
    /// <summary>
    /// 应用程序的主入口点。
    /// </summary>
    [STAThread]
    static void Main()
    {
      Process[] processes = Process.GetProcesses();
      Process currentProcess = Process.GetCurrentProcess();
      bool processExist = false;
      foreach (Process p in processes)
      {
        if (p.ProcessName == currentProcess.ProcessName && p.Id != currentProcess.Id)
        {
          processExist = true;
        }
      }

      if (processExist)
      {
        Application.Exit();
      }
      else
      {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1());
      }
    }
  }

static class Program
  {
    /// <summary>
    /// 应用程序的主入口点。
    /// </summary>
    [STAThread]
    static void Main()
    {
      string processName = Process.GetCurrentProcess().ProcessName;
      Process[] processes = Process.GetProcessesByName(processName);
      //如果该数组长度大于1，说明多次运行
      if (processes.Length > 1)
      {
        MessageBox.Show("程序已运行，不能再次打开！");
        Environment.Exit(1);
      }
      else
      {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new Form1());
      }
    }
  }

static class Program
{
    /// <summary>
    /// 应用程序的主入口点。
    /// </summary>
    [STAThread]
    static void Main()
    {
      bool isAppRunning = false;
      Mutex mutex = new Mutex(true, System.Diagnostics.Process.GetCurrentProcess().ProcessName, out isAppRunning);
      if (!isAppRunning)
      {
        MessageBox.Show("程序已运行，不能再次打开！");
        Environment.Exit(1);
      }
      Application.EnableVisualStyles();
      Application.SetCompatibleTextRenderingDefault(false);
      Application.Run(new Form1());
    }
}