保证程序只有一个实例运行并且先将旧实例关闭再运行新实例

using System.Collections.Generic;

using System.Windows.Forms;

using System.Threading;

using System.Diagnostics;

using System.Reflection;

namespace MyClient

{

    

    static class Program

    {

        /// <summary>

        /// The main entry point for the application.

        /// </summary>

        [STAThread]

        static void Main(string[] args)

        {

            Application.EnableVisualStyles();

            Application.SetCompatibleTextRenderingDefault(false);

            //bool blnCreate;//Another method to make sure only one instance

            //Mutex m = new Mutex(true, “MyClient”, out blnCreate);

            //if (blnCreate)

            CloseRunningInstance();

            Application.Run(new MainFrm());

        }

        //Close the existed instance of my application

        static void CloseRunningInstance()

        {

            Process current = Process.GetCurrentProcess();

            Process[] processes = Process.GetProcessesByName(current.ProcessName);

            //Loop through the running processes in with the same name    

            foreach (Process process in processes)

            {

                //Ignore the current process    

                if (process.Id != current.Id)

                {

                    //Make sure that the process is running from the exe file.    

                    if (Assembly.GetExecutingAssembly().Location.Replace("/", "\") == current.MainModule.FileName)

                    {

                        //Close the other process instance.   

                        process.Kill();

                        process.WaitForExit();

                    }

                }

            }

        } 

    }

}

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