Xamarin Forms - 使用 MediaGallery 插件将多个图像发送到文件流

Question

我正在开发 Xamarin Forms 应用程序，并且添加了一些代码来从手机图库中选择多个图像，然后需要将所有选定的图像发送到文件 steam。

从图库中选择多个图像工作正常，但仅发送最后选择的图像。

下面是我的代码

private async Task OnGetExistingPhotoAsync() {
  try {
    // Selecting multiple images with the MediaGallery plugin

    var results = await MediaGallery.PickAsync(3, MediaFileType.Image);
    var parameter = new NavigationParameters();

    if (results?.Files == null) {
      return;
    }

    foreach(var photo in results.Files) {
      if (photo == null) {
        PhotoPath = null;
        return;
      }

      string newFile = Path.Combine(FileSystem.CacheDirectory, photo.NameWithoutExtension);
      using(var stream = await photo.OpenReadAsync())
      using(var newStream = File.OpenWrite(newFile))
      await stream.CopyToAsync(newStream);
      PhotoPath = newFile;

      // This here is only sending the PATH of the last selected image from the gallery
      parameter.Add("PhotoPath", PhotoPath);


      // In my attempt here, I tried to add each image PATH to a list Array
      // But this is not working!
      /*
      List<string> imageFiles = new List<string>();
      imageFiles.Add(Path.Combine(FileSystem.CacheDirectory, photo.NameWithoutExtension));

      String[] newFile = imageFiles.ToArray();

      using (var stream = await photo.OpenReadAsync())
      using (var newStream = File.OpenWrite(newFile)) // This here says that it cannot convert ( string[] to string )
          await stream.CopyToAsync(newStream);

      parameter.Add("PhotoPath", PhotoPath);
      */

    }

    //OUTPUT :  The PATH is : /data/user/0/se.company.trret.cyn/cache/IMG_20220307_005342
    Console.WriteLine("The PATH is : " + PhotoPath);

    await _navigationService.GoBackAsync(parameter);
  } catch (FeatureNotSupportedException fnsEx) {
    await App.Current.MainPage.DisplayAlert("Ett fel inträffade", "Den här funktionen stöds inte av din enhet.", "Ok");
  } catch (PermissionException pEx) {
    await App.Current.MainPage.DisplayAlert("Ett fel inträffade", "Cykelstaden saknar rättigheter för att läsa dina filer.", "Ok");
  } catch (Exception e) {
    await App.Current.MainPage.DisplayAlert("Ett fel inträffade", "Ett oväntat fel inträffade. Var god försök igen.", "Ok");
    Crashes.TrackError(e);
  }
}