c#实现同一个实例只能运行一次

using System;
using System.Collections.Generic;
using System.Text;
using IRADManager.Common;
using System.Diagnostics;
using Microsoft.Win32;
using System.IO;
using System.Resources;
using System.Reflection;
using System.Threading;
using System.Globalization;

namespace common
{
  public class util
  {
     ///
     ///方法RunedTest表示：根据当前进程名判断是否存在相同进程，如果存在只能运行一个实例并且返回true,否则返回false.
     ///
     public static bool RunedTest()
     {
            Process cp = Process.GetCurrentProcess();
            Process[] ps = Process.GetProcessesByName(cp.ProcessName);
            return ps != null &&  ps.Length >1;

     }
  }
}