基于.Net平台唯一运行实例C#代码实现

        /// <summary>
        /// 获取或设置程序运行标志，必须符合Windows文件命名规范
        /// 这里实现生成临时文件为依据，如果修改成设置注册表，那就不需要符合文件命名规范。
        /// </summary>
        public static string RunFlag
        {

            get
            {
                if(runFlagFullname == null)
                {
                    string assemblyFullName = Assembly.GetEntryAssembly().FullName;
                    //CommonApplicationData：//"C:\\Documents and Settings\\All Users\\Application Data"
                    string path = Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData);
                    //"C:\\Program Files\\Common Files"
                    //string path = Environment.GetFolderPath(Environment.SpecialFolder.CommonProgramFiles);
                    runFlagFullname = Path.Combine(path, assemblyFullName);
                }
                return runFlagFullname;
            }
            set
            {
                runFlagFullname = value;
            }
        }
        #endregion
    }

}

Program.cs文件，

using System;
using System.Windows.Forms;
using System.Diagnostics;
using Zhengzuo.CSharpCode;
/*------------------------------------------------
  郑佐 2006-07-01  http://blog.csdn.net/zhzuo
--------------------------------------------------*/
namespace Zhengzuo.Test.WinGui
{
    static class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            if (args.Length == 0) //没有传送参数
            {
                Process p = SingleInstance.GetRunningInstance();
                if (p != null) //已经有应用程序副本执行
                {
                    SingleInstance.HandleRunningInstance(p);
                }
                else //启动第一个应用程序
                {
                    RunApplication();
                }
            }
            else //有多个参数
            {
                switch (args[0].ToLower())
                {
                    case "-api":
                        if (SingleInstance.HandleRunningInstance() == false)
                        {
                            RunApplication();
                        }
                        break;
                    case "-mutex":
                        if (args.Length >= 2) //参数中传入互斥体名称
                        {
                            if ( SingleInstance.CreateMutex(args[1]) )
                            {
                                RunApplication();
                                SingleInstance.ReleaseMutex();
                            }
                            else
                            {
                                //调用SingleInstance.HandleRunningInstance()方法显示到前台。
                                MessageBox.Show("程序已经运行！");
                            }
                        }
                        else
                        {
                            if (SingleInstance.CreateMutex())
                            {
                                RunApplication();
                                SingleInstance.ReleaseMutex();
                            }
                            else
                            {
                                //调用SingleInstance.HandleRunningInstance()方法显示到前台。
                                MessageBox.Show("程序已经运行！");
                            }
                        }
                        break;
                    case "-flag"://使用该方式需要在程序退出时调用
                        if (args.Length >= 2) //参数中传入运行标志文件名称
                        {
                            SingleInstance.RunFlag = args[1];                         
                        }
                        try
                        {
                            if (SingleInstance.InitRunFlag())
                            {
                                RunApplication();
                                SingleInstance.DisposeRunFlag();
                            }
                            else
                            {
                                //调用SingleInstance.HandleRunningInstance()方法显示到前台。
                                MessageBox.Show("程序已经运行！");
                            }
                        }
                        catch (Exception ex)
                        {
                            MessageBox.Show(ex.ToString());
                        }
                        break;
                    default:
                        MessageBox.Show("应用程序参数设置失败。");
                        break;
                }
            }
        } 

        //启动应用程序
        static void RunApplication()
        {
            Application.EnableVisualStyles();
            Application.Run(new MainForm());
        }
    }
}

运行CMD命令行，
第一种调用方式：
WindowsApplication1.exe
或 WindowsApplication1.exe –api
第二种调用方式：
WindowsApplication1.exe –mutex
或WindowsApplication1.exe –mutex {F140AE26-626C-42f8-BD49-45025742205E}
第三种调用方式：
WindowsApplication1.exe –flag
或WindowsApplication1.exe –flag c:\blog.csdn.net.zhzuo

针对远程访问的测试，需要在系统管理工具的.NET Framework 2.0 Configuration中进行设置授权该局域网路径允许访问，否则会抛出System.Security.SecurityException异常。
根据测试结果可见三种实现方式适用范围不同，理想的实现是结合他们的优点进行多点判断。
 
更多资源
关于.NET平台应用的开发，更多的技术文章可以访问http://blog.csdn.net/zhzuo，对于本文的建议或意见可在网站上留言。

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