如何确保C#的应用程序只被打开一次

http://stackoverflow.com/questions/184084/how-to-force-c-sharp-net-app-to-run-only-one-instance-in-windows

using System.Threading;



[DllImport("user32.dll")]

[return: MarshalAs(UnmanagedType.Bool)]

static extern bool SetForegroundWindow(IntPtr hWnd);



/// <summary>

/// The main entry point for the application.

/// </summary>

[STAThread]

static void Main()

{

   bool createdNew = true;

   using (Mutex mutex = new Mutex(true, "MyApplicationName", out createdNew))

   {

      if (createdNew)

      {

         Application.EnableVisualStyles();

         Application.SetCompatibleTextRenderingDefault(false);

         Application.Run(new MainForm());

      }

      else

      {

         Process current = Process.GetCurrentProcess();

         foreach (Process process in Process.GetProcessesByName(current.ProcessName))

         {

            if (process.Id != current.Id)

            {

               SetForegroundWindow(process.MainWindowHandle);

               break;

            }

         }

      }

   }

}

上面代码的MyApplicationName需要确保是唯一识别的

 

VS调试程序的时候

string appName;
appName = Process.GetCurrentProcess().ProcessName;//ZITaker.vshost

appName = Process.GetCurrentProcess().MainModule.FileName;//D:\Software\ZBMYun\SourceCode\ZITaker\ZITaker\bin\Debug\ZITaker.vshost.exe

appName = System.Reflection.Assembly.GetExecutingAssembly().GetName().Name;//ZITaker

appName = System.Reflection.Assembly.GetExecutingAssembly().Location;//D:\Software\ZBMYun\SourceCode\ZITaker\ZITaker\bin\Debug\ZITaker.exe

 

直接执行exe的时候

string appName;
appName = Process.GetCurrentProcess().ProcessName;//ZITaker

appName = Process.GetCurrentProcess().MainModule.FileName;//D:\Software\ZBMYun\SourceCode\ZITaker\ZITaker\bin\Debug\ZITaker.exe

appName = System.Reflection.Assembly.GetExecutingAssembly().GetName().Name;//ZITaker

appName = System.Reflection.Assembly.GetExecutingAssembly().Location;//D:\Software\ZBMYun\SourceCode\ZITaker\ZITaker\bin\Debug\ZITaker.exe

 

从上面可以看出System.Reflection.Assembly.GetExecutingAssembly().Location适合作为程序的唯一识别码

http://stackoverflow.com/questions/4313756/creating-a-mutex-throws-a-directorynotfoundexception    //遇到找不到文件路径的错误

My mutex name had \ in it, which windows was interpreting as a path character. Running:

将路径名中的反斜杠替换成_就可以了

 

正确的做法：

string appName;
appName = System.Reflection.Assembly.GetExecutingAssembly().Location;
appName = appName.Replace(Path.DirectorySeparatorChar, '_');
using (Mutex mutex = new Mutex(true, appName, out createdNew))

 

 

 

appName = Process.GetCurrentProcess().MainModule.FileName;//D:\Software\ZBMYun\SourceCode\ZITaker\ZITaker\bin\Debug\ZITaker.vshost.exe
ZBM.ZITaker.Log.OperationLog.Instance.WriteLog(appName, ZBM.ZITaker.Log.LogType.UI);
appName = System.Reflection.Assembly.GetExecutingAssembly().GetName().Name;//ZITaker
ZBM.ZITaker.Log.OperationLog.Instance.WriteLog(appName, ZBM.ZITaker.Log.LogType.UI);
appName = System.Reflection.Assembly.GetExecutingAssembly().Location;//D:\Software\ZBMYun\SourceCode\ZITaker\ZITaker\bin\Debug\ZITaker.exe
ZBM.ZITaker.Log.OperationLog.Instance.WriteLog(appName, ZBM.ZITaker.Log.LogType.UI);

最终版本

using System;

using System.Windows.Forms;//Application

using System.Diagnostics;//Process

using System.Threading;//Mutex

using System.Runtime.InteropServices;//DllImport

using System.IO;//Path



static class Program

    {

        [DllImport("User32.dll")]

        //This function puts the thread that created the specified window into the foreground and activates the window.

        private static extern bool SetForegroundWindow(IntPtr hWnd);



        /// <summary>

        /// 应用程序的主入口点。

        /// </summary>

        [STAThread]

        static void Main()

        {

            try

            {

                bool createdNew;

                string appName;

                appName = System.Reflection.Assembly.GetExecutingAssembly().Location;
                appName = appName.Replace(Path.DirectorySeparatorChar, '_');using (Mutex mutex = new Mutex(true, appName, out createdNew))

                {

                    if (createdNew)

                    {

                        Application.EnableVisualStyles();

                        Application.SetCompatibleTextRenderingDefault(false);

                        Application.Run(new Main());

                    }

                    else

                    {

                        Process current = Process.GetCurrentProcess();

                        foreach (Process process in Process.GetProcessesByName(current.ProcessName))

                        {

                            if (process.Id != current.Id)

                            {

                                SetForegroundWindow(process.MainWindowHandle);

                                break;

                            }

                        }

                    }

                }

            }

            catch (Exception ex)

            {

               

            }

        }

    }