【162】一个程序只能运行一个

//=====判断进程法：(修改程序名字后依然能执行)=====
            Process current = Process.GetCurrentProcess();
            Process[] processes = Process.GetProcessesByName(current.ProcessName);
            foreach (Process process in processes)
            {
                if (process.Id != current.Id)
               {
                    if (process.MainModule.FileName
                    == current.MainModule.FileName)
                    {
                        MessageBox.Show("程序已经运行！", Application.ProductName,
                        MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                        return;
                    }
                }
            }