Uri激活为“ ms-appdata：/// local /”

Question

Running this code below gives me this unexpected result:

    private async void OpenItemAppBarBtn_Click(object sender, RoutedEventArgs e)
    {
        MediaViewModel media = MyListView.SelectedItem as MediaViewModel;

        if (media.VidOrPic)
        {
            var uriString = "ms-appdata:///local/" + media.Name + ".mp4";
            Uri muUri = new Uri(uriString);
            Launcher.LaunchUriAsync(new Uri(uriString, UriKind.RelativeOrAbsolute));
        }
        else
        {
            var uriString = "ms-appdata:///local/" + media.Name + ".jpeg";
            Uri muUri = new Uri(uriString);
            Launcher.LaunchUriAsync(new Uri(uriString, UriKind.RelativeOrAbsolute));
        }   
    }

UriString Content:

Answer 1

The Launcher.LaunchUriAsync method always shows the application picker, if no default application is associated with the Uri you provide.

However, there's an overload :

Launcher.LaunchUriAsync(Uri, LauncherOptions)

The launcher options allow you to set a property called DisplayApplicationPicker . If the default app is defined and you set this value to true, using the overload, the application will start directly, without displaying the application picker.

Answer 2

to run the file use Launcher.LaunchFileAsync, not Launcher.LaunchUriAsync

var uriString = "ms-appdata:///local/" + media.Name + ".mp4";
Uri muUri = new Uri(uriString);
var file = await StorageFile.GetFileFromApplicationUriAsync(muUri);
await Launcher.LaunchFileAsync(file);