File Association App LifeCycle File Handling

[WebAssemblyMan]

Hi,

I am working with File Association and File handling for a WindowsSDK App.

In App.xaml.cs OnLaunched, I have the following, may I know how do I get the file that triggered the app?

    protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
    {
        var activatedEventArgs = Microsoft.Windows.AppLifecycle.AppInstance.GetCurrent().GetActivatedEventArgs();
        if (activatedEventArgs.Kind == Microsoft.Windows.AppLifecycle.ExtendedActivationKind.File)
        {
            System.Diagnostics.Debug.WriteLine("Launch new instance to hadle file?");
            //how to get the file or file name here? 
            //In UWP I can use System.Diagnostics.Debug.WriteLine(args.Files[0].Name);
        }
    }

Package.appxmanifest

  <Extensions>
    <uap:Extension Category="windows.fileTypeAssociation">
      <uap:FileTypeAssociation Name="lxml">
        <uap:SupportedFileTypes>
          <uap:FileType>.lxml</uap:FileType>
        </uap:SupportedFileTypes>
      </uap:FileTypeAssociation>
    </uap:Extension>
  </Extensions>

[seven-mile]

I think you can cast activatedEventArgs into Windows::ApplicationModel::Activation::IFileActivatedEventArgs interface directly. Then access properties in it to get the information you need.

[WebAssemblyMan]

Hi,
@seven-mile

Thanks for your reply.

In my C# app, I am getting

CS0030 Cannot convert type 'Microsoft.Windows.AppLifecycle.AppActivationArguments' to 'Windows.ApplicationModel.Activation.IFileActivatedEventArgs'

[andreww-msft]

AppActivationArguments exposes a Data property - that's the thing you can cast:

AppActivationArguments args = AppInstance.GetCurrent().GetActivatedEventArgs();
ExtendedActivationKind kind = args.Kind;
if (kind == ExtendedActivationKind.File)
{
try
{
if (args.Data is IFileActivatedEventArgs fileArgs)
{
IStorageItem file = fileArgs.Files[0];
}
}
}

See the C# WinUI instancing sample for more details.

[WebAssemblyMan]

Hi @seven-mile, @andreww-msft

I get it now. Thank you for your help.