打开相关文件，如WPF中的'记事本++选项卡功能'

Question

此问题是关于WPF应用程序。 我想用我的自定义应用程序打开一些关联的文件。 我找到了打开关联文件的方法。 但仍然，我不知道如何处理重复的应用程序。例如， 如果点击“a.txt2”，我的应用程序将打开它。 我点击'a2.txt2'，它也打开了我的应用程序的另一个过程。

我想仅在第一个应用程序中获得第二次点击信息，而不是在单击关联文件时执行我的应用程序。 它与'记事本++'打开文件到选项卡功能类似。

这是我的代码。

1 MainWindow.cs

public partial class MainWindow : Window 
{ 
    public MainWindow() 
    { 
     InitializeComponent(); 

     this.Loaded += new RoutedEventHandler(MainContainer_Loaded); 
    } 
    void MainContainer_Loaded(object sender, RoutedEventArgs e) 
    { 
     string fn = "x"; 
     if (Application.Current.Properties["ArbitraryArgName"] != null) 
     { 
      fn = Application.Current.Properties["ArbitraryArgName"].ToString(); 

     } 
     this.Title = fn; 
    } 
} 

2的App.xaml

<Application x:Class="sample.App" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     > 
<Application.Resources> 

</Application.Resources> 
<!-- 
StartupUri="MainWindow.xaml" 
Startup="App_Startup"--></Application> 

3 app.cs

public partial class App : Application 
{ 
    protected override void OnStartup(StartupEventArgs e) 
    { 
     // Check if this was launched by double-clicking a doc. If so, use that as the 
     // startup file name. 
     string fname = "No filename given"; 
     if (AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData != null 
     && AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData.Length > 0) 
     { 

      try 
      { 
       fname = AppDomain.CurrentDomain.SetupInformation.ActivationArguments.ActivationData[0]; 

       // It comes in as a URI; this helps to convert it to a path. 
       Uri uri = new Uri(fname); 
       fname = uri.LocalPath; 

       this.Properties["ArbitraryArgName"] = fname; 
      } 
      catch 
      { 
       // For some reason, this couldn't be read as a URI. 
       // Do what you must... 
      } 
     } 

     string procName = Process.GetCurrentProcess().ProcessName; 

     // get the list of all processes by the "procName"  
     Process[] processes = Process.GetProcessesByName(procName); 
     if (processes.Length > 1) 
     { 

      MessageBox.Show(procName + " already running"); 

      //App a = new App(); 
      //a.Shutdown(); 
     } 
     else 
     { 
     } 
     MainWindow mainWindow = new MainWindow(); 
     mainWindow.Show(); 
     base.OnStartup(e); 
    } 
} 

感谢。

Answer 1

使用底单单一实例TECHNIC，现有以 “Microsoft.VisualBasic程序” 的命名空间：

using System; 

namespace Sample 
{ 
    public class Startup 
    { 
     [STAThread] 
     public static void Main(string[] args) 
     { 
      SingleInstanceApplicationWrapper wrapper = new SingleInstanceApplicationWrapper(); 
      wrapper.Run(args); 
     } 
    } 

    public class SingleInstanceApplicationWrapper : 
     Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase 
    { 
     public SingleInstanceApplicationWrapper() 
     { 
      // Enable single-instance mode. 
      this.IsSingleInstance = true; 
     } 

     // Create the WPF application class. 
     private WpfApp app; 
     protected override bool OnStartup(
      Microsoft.VisualBasic.ApplicationServices.StartupEventArgs e) 
     { 


      app = new WpfApp(); 
      app.Run(); 

      return false; 
     } 

     // Direct multiple instances 
     protected override void OnStartupNextInstance(
      Microsoft.VisualBasic.ApplicationServices.StartupNextInstanceEventArgs e) 
     { 
      if (e.CommandLine.Count > 0) 
      { 
       ((MainWindow)app.MainWindow).openFile(e.CommandLine[0]); 
      } 
     } 
    } 

    public class WpfApp : System.Windows.Application 
    { 
     protected override void OnStartup(System.Windows.StartupEventArgs e) 
     { 
      base.OnStartup(e); 

      // Load the main window. 
      MainWindow main = new MainWindow(); 
      this.MainWindow = main; 
      main.Show(); 

      // Load the document that was specified as an argument. 
      if (e.Args.Length > 0) main.openFile(e.Args[0]); 
     } 



    } 
}