c# 只允许一个实例运行

1.单件模式,Singleton,应用程序只能允许一个实例在运行.这是最好的解决方法
2.查询系统进程里是不是已经运行.
private void Form1_Load(object sender, EventArgs e)
        {
            string fileName = Path.GetFileNameWithoutExtension(Application.ExecutablePath);
            Process[] processes = Process.GetProcessesByName(fileName);
            Process currentProcess = Process.GetCurrentProcess();
            foreach (Process p in processes)
            {
                if (p.Id != currentProcess.Id)
                {
                    p.Kill();
                }
            }
        }