c# winform程序启动时判断本身是否在运行，是否已经运行

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace AutoPackSystem
{
    static class Program
    {  //by txwtech
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);

            if (IsRunning())
            {
                MessageBox.Show("AutoPackSystem.exe已经运行");
                return;
            }
             bool IsRunning()
            {
                Process current = default(Process);
                current = System.Diagnostics.Process.GetCurrentProcess();
                Process[] processes = null;
                processes = System.Diagnostics.Process.GetProcessesByName(current.ProcessName);

                Process process = default(Process);

                foreach (Process tempLoopVar_process in processes)
                {
                    process = tempLoopVar_process;

                    if (process.Id != current.Id)
                    {
                        if (System.Reflection.Assembly.GetExecutingAssembly().Location.Replace("/", "\") == current.MainModule.FileName)
                        {
                            return true;

                        }

                    }
                }
                return false;

            }






            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
           
        }
    }
}