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【CSharp】实现确保单进程类
作者:dezai / 发布于2014/5/21/ 395

	通过监听本地设定的TCP端口实现，无网卡也没问题。解决防火墙问题，不会弹出防火墙询问。

	using System.Text;
	using System.Net.Sockets;
	using System.IO;
	using System.Threading;
	using System.Net;

	namespace aaaSoft
	{
	 /// <summary>
	 /// 单进程类
	 /// </summary>
	 class SingleProcess
	 {
	 private string GuidString;
	 private int TcpPort;
	 private TcpListener listener;

	 /// <summary>
	 /// 构造函数
	 /// </summary>
	 /// <param name="GuidString">唯一标识符</param>
	 /// <param name="TcpPort">监听TCP端口号</param>
	 public SingleProcess(string GuidString, int TcpPort)
	 {
	 this.GuidString = GuidString;
	 this.TcpPort = TcpPort;
	 }

	 /// <summary>
	 /// 当第二进程运行时引发
	 /// </summary>
	 public event EventHandler SecondProcessStart;

	 /// <summary>
	 /// 开始确保单进程
	 /// </summary>
	 public void Start()
	 {
	 try
	 {
	 listener = new TcpListener(IPAddress.Parse("127.0.0.1"), TcpPort);
	 listener.Start();
	 Thread trdListen = new Thread(Run);
	 trdListen.Start();
	 }
	 catch
	 {
	 //说明已经有实例存在
	 TcpClient client = new TcpClient();
	 client.Connect("127.0.0.1", TcpPort);
	 NetworkStream ns = client.GetStream();
	 byte[] buffer = Encoding.Default.GetBytes(GuidString);
	 ns.Write(buffer, 0, buffer.Length);
	 ns.Close();
	 Environment.Exit(0);
	 }
	 }
	 /// <summary>
	 /// 结束确保单进程
	 /// </summary>
	 public void Stop()
	 {
	 listener.Stop();
	 }

	 private void Run()
	 {
	 try
	 {
	 while (true)
	 {
	 TcpClient client = listener.AcceptTcpClient();
	 NetworkStream ns = client.GetStream();
	 StreamReader sr = new StreamReader(ns);
	 string s = sr.ReadToEnd();
	 ns.Close();
	 if (s.Equals(GuidString))
	 {
	 //触发事件
	 SecondProcessStart.Invoke(null, null);
	 }
	 }
	 }
	 catch { }
	 }
	 }
	}

	==================================================================

	下面是使用示例，仅需要修改Program.cs文件(Demo项目Program.cs文件如下)：

	==================================================================

	using System;
	using System.Collections.Generic;
	using System.Windows.Forms;

	namespace 单实例运行
	{
	 static class Program
	 {
	 const int TcpPort = 53256;
	 const string GuidString = "C0DA3908-7F39-45ad-8E5B-CC47064031EA";
	 public static aaaSoft.SingleProcess sp;

	 public static Form frmMain;
	 /// <summary>
	 /// 应用程序的主入口点。
	 /// </summary>
	 [STAThread]
	 static void Main()
	 {
	 Application.EnableVisualStyles();
	 Application.SetCompatibleTextRenderingDefault(false);
	 frmMain = new Form1();

	 sp = new aaaSoft.SingleProcess(GuidString, TcpPort);
	 sp.SecondProcessStart += new EventHandler(sp_SecondProcessStart);
	 sp.Start();
	 Application.Run(frmMain);
	 sp.Stop();
	 }

	 static void sp_SecondProcessStart(object sender, EventArgs e)
	 {
	 frmMain.WindowState = FormWindowState.Normal;
	 frmMain.Show();
	 frmMain.Activate();
	 }
	 }
	}
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