检测进程，只能启动一个

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 /// <summary>
        /// 检测进程，只能启动一个
        /// </summary>
        static void CheckProcess()
        {

            Process currentProcess = Process.GetCurrentProcess();
            foreach (Process item in Process.GetProcessesByName(currentProcess.ProcessName))
            {
                if (item.Id != currentProcess.Id &&
                (item.StartTime - currentProcess.StartTime).TotalMilliseconds <= 0)
                {
                    item.Kill();
                    item.WaitForExit();
                    break;
                }
            }
        }