ffimageloading DownloadException: Zero length stream with Xamarin Hot Restart on iPhone

🐛 Bug Report

When using the latest Visual Studio 16.5 on Windows 10 with Xamarin’s Hot Restart enabled, ffimageloading throws FFImageLoading.Exceptions.DownloadException: Zero length stream error while trying to load an image.

Full exception log:

2020-03-21 00:40:45.532 Xamarin.PreBuilt.iOS[1184:451651] Image loading failed: https://s3-us-west-2.amazonaws.com/grial-images/v3.0/article_04.jpg
FFImageLoading.Exceptions.DownloadException: Zero length stream
  at FFImageLoading.Cache.DownloadCache.DownloadAsync (System.String url, System.Threading.CancellationToken token, System.Net.Http.HttpClient client, FFImageLoading.Work.TaskParameter parameters, FFImageLoading.DownloadInformation downloadInformation) [0x006bd] in C:\projects\ffimageloading\source\FFImageLoading.Common\Cache\DownloadCache.cs:174 
  at FFImageLoading.Cache.DownloadCache+<>c__DisplayClass15_0.<DownloadAndCacheIfNeededAsync>b__0 () [0x00050] in C:\projects\ffimageloading\source\FFImageLoading.Common\Cache\DownloadCache.cs:58 
  at FFImageLoading.Retry.DoAsync[T] (System.Func`1[TResult] action, System.TimeSpan retryInterval, System.Int32 retryCount, System.Action onRetry) [0x000b2] in C:\projects\ffimageloading\source\FFImageLoading.Common\Helpers\Retry.cs:24 
  at FFImageLoading.Cache.D
ng.Common\Work\ImageLoaderTask.cs:618 
ownloadCache.DownloadAndCacheIfNeededAsync (System.String url, FFImageLoading.Work.TaskParameter parameters, FFImageLoading.Config.Configuration configuration, System.Threading.CancellationToken token) [0x00401] in C:\projects\ffimageloading\source\FFImageLoading.Common\Cache\DownloadCache.cs:57 
  at FFImageLoading.DataResolvers.UrlDataResolver.Resolve (System.String identifier, FFImageLoading.Work.TaskParameter parameters, System.Threading.CancellationToken token) [0x00045] in C:\projects\ffimageloading\source\FFImageLoading.Common\DataResolvers\UrlDataResolver.cs:22 
  at FFImageLoading.DataResolvers.WrappedDataResolver.Resolve (System.String identifier, FFImageLoading.Work.TaskParameter parameters, System.Threading.CancellationToken token) [0x0004e] in C:\projects\ffimageloading\source\FFImageLoading.Common\DataResolvers\WrappedDataResolver.cs:21 
  at FFImageLoading.Work.ImageLoaderTask`3[TDecoderContainer,TImageContainer,TImageView].RunAsync () [0x00300] in C:\projects\ffimageloading\source\FFImageLoadi

Expected behavior

To load an image without the error.

Reproduction steps

Try using ffimageloading in any form or way on Windows 10 with Visual Studio 16.5 and Xamarin Hot Restart enabled while debugging on iPhone connected with USB.

Configuration

Version: 2.4.11.982

Platform:

• 📱 iOS
• 🤖 Android
• 🏁 WPF
• 🌎 UWP
• 🍎 MacOS
• 📺 tvOS
• 🐒 Xamarin.Forms

[PieEatingNinjas]

I’m seeing the exact same issue. I’m using version 2.4.11.982, Xamarin Forms version 4.8.0.1269 on iOS 13.6.1 (Hot Reload). On Android everything is working well.

Currently have a rather naive ‘solution’:

public class SourceConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (Device.RuntimePlatform == Device.Android)
            return value;

        if(value != null)
            return ImageSource.FromStream(() => new MemoryStream(new WebClient().DownloadData(value.ToString())));

        return null;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

Source="{Binding DetailViewModel.HeaderImage, Converter={StaticResource sourceConverter}}"

Not proud of it, but it works. Hopefully someone can find the source of this issue, so we can leave out dirty hacks like this 😉

[rredureis]

same error here, debugging from a mac, no image is showed