如何检测系统是否已经运行了相同的程序。

using System;
using System.Xml;
using System.ComponentModel ;
using System.Windows.Forms;
using System.Diagnostics;
using System.Runtime;
using System.Reflection;
using System.Runtime.InteropServices;

[STAThread]
  static void Main()   //主程序运行
  {
   Process intance=RunningIntance();  //调用检查函数
   if(intance==null)    //不存在相同的程序
   {
        Application.Run(new frmMain());
      }
   else  //存在相同的程序
   {
    HandleRunningInstance(intance);
   }

 }


private static Process RunningIntance()
  {
   Process currentProcess=Process.GetCurrentProcess();
   Process [] processCollection=Process.GetProcessesByName(currentProcess.ProcessName);
   foreach(Process p in processCollection)
   {
    if(p.Id!=currentProcess.Id)  //检查ID是否相同
    {
        //检查运行文件路径是否相同
     if(Assembly.GetExecutingAssembly().Location.Replace("/","\\")==currentProcess.MainModule.FileName)
      return currentProcess;
    }
   }
   return null;
  }

  private static void HandleRunningInstance(Process instance)
  {
   MessageBox.Show("该应用系统（PSP）已经在运行！","提示信息",MessageBoxButtons.OK,MessageBoxIcon.Information);
   ShowWindowAsync(instance.MainWindowHandle,1); //调用api函数，正常显示窗口
   SetForegroundWindow(instance.MainWindowHandle); //将窗口放置最前端。
    
  }

  [DllImport("User32.dll")]
  private static extern bool ShowWindowAsync(System.IntPtr hWnd, int cmdShow);
  [DllImport("User32.dll")]
  private static extern bool SetForegroundWindow(System.IntPtr hWnd);

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