Multiple Instances of App

Question

Hi UWP experts,

So i have enabled multiple instances of my app through the package manifest

desktop4:SupportsMultipleInstances="true" and it works perfectly fine when the app is selected from the windows start menu and opens up multiple instances . The app has an option to open the same app in another process . How to programatically open it similiar to open multiple instances from start up menu?

I don't wont to go via the secondary window approach using a new dispatcher thread from the current app.

Thanks

Answer 1

Hi @DotNET Fan ,

It is recommended to register a protocol to launch your UWP app.

App,xaml.cs

protected override void OnActivated(IActivatedEventArgs args)
{
    // Window management
    Frame rootFrame = Window.Current.Content as Frame;
    if (rootFrame == null)
    {
        rootFrame = new Frame();
        Window.Current.Content = rootFrame;
    }
    rootFrame.Navigate(typeof(MainPage), args);
    Window.Current.Activate();
}

MainPage.xaml.cs

private async void Button_Click(object sender, RoutedEventArgs e)
{
    var uri = new Uri("test-app2app:");
    var success = await Windows.System.Launcher.LaunchUriAsync(uri);
}

Package.appxmanifest

  <Applications>
    <Application Id="App"
      Executable="$targetnametoken$.exe"
      EntryPoint="UWPlaunchTest.App"
      desktop4:SupportsMultipleInstances="true">
      
      <Extensions>
        <uap:Extension Category="windows.protocol">
          <uap:Protocol Name="test-app2app" ReturnResults="always">
            <uap:DisplayName>Test app-2-app</uap:DisplayName>
          </uap:Protocol>
        </uap:Extension>
      </Extensions>
      
      <uap:VisualElements
        DisplayName="UWPlaunchTest"
        Square150x150Logo="Assets\Square150x150Logo.png"
        Square44x44Logo="Assets\Square44x44Logo.png"
        Description="UWPlaunchTest"
        BackgroundColor="transparent">
        <uap:DefaultTile Wide310x150Logo="Assets\Wide310x150Logo.png"/>
        <uap:SplashScreen Image="Assets\SplashScreen.png" />
      </uap:VisualElements>
    </Application>
  </Applications>

Thank you.

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