.NET 4单个应用程序实例 [英] .NET 4 single application instance

问题描述

我经常写.NET应用程序只支持一个实例。以前我用.NET的远程处理，现在WCF来检测是否已经我的应用程序的一个实例正在运行，并给予重点此实例。

I often write .net applications that only support one instance. Formerly I used .net-remoting and now WCF to detect if already an instance of my app is running and giving the focus to this instance.

我的问题是，如果没有与.NET4一个更好的解决方案，可实现单实例应用程序（或有一般一个更好的解决方案可用，因为加载WCF或应用程序的最开始远程处理组件具有不良性能影响）

My question is, if there is with .net4 a better solution available to achieve single instance applications (or is there in general a better solution available, because loading the WCF or remoting assembly at the very start of the application has a bad performance influence)

更新

感谢所有的职位。回答我最初的问题似乎是否，有什么新的在.NET 4 实现单实例应用程序。

Thanks for all the post. The answer to my initial question seems to be "no, there is nothing new to achieve single instance applications within .net 4".

感谢所有的其他信息，我会改变我目前的项目中使用互斥来提供所需的功能。我接受了鲍勃·摩尔的答案，因为它连接到它的信息最多，但感谢所有谁张贴的有用信息。

Thanks to all the additional information, I will change my current projects to use a Mutex to provide the desired functionality. I accepted the answer of Bob Moore because it has the most information attached to it, but thanks to all who posted useful information.

推荐答案

传统的方式做，这是一个互斥体，如：

The traditional way to do this is with a mutex, e.g.

bool bNew = true; 
using (Mutex mutex = new Mutex(true, "MYAPP_0D36E4C9-399D-4b05-BDA3-EE059FB77E8D", out bNew))
{
   if (bNew)
   {
       // blah, blah,
       Application.Run(new MainForm());
   }
}

编辑：

我发现这个code网上调用SetForegroundWindow，所以你可以找到你的应用程序的其他实例，并显示它：

I found this code to invoke SetForegroundWindow online, so you can find the other instance of your app and bring it forward:

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool SetForegroundWindow(IntPtr hWnd);


Process me = Process.GetCurrentProcess();
foreach (Process process in Process.GetProcessesByName (me.ProcessName))
{
   if (process.Id != me.Id)
   {
      SetForegroundWindow (process.MainWindowHandle);
      break;
   }
}

请注意，在现代的Windows实现，你只能给前台了。

Note that in modern Windows implementations you can only give the foreground away.

这篇关于.NET 4单个应用程序实例的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！