[Bug] MediaPicker: System.ObjectDisposedException when trying to send picked photos to an API

[michaldivis]

Description

I'm getting the System.ObjectDisposedException exception when trying to send my picked photos to an API.

It doesn't seem to matter whether I use the CapturePhotoAsync or the PickPhotoAsync method. Both produce this exception.

The captured photo path is:
/data/user/0/cz.company.myapp/cache/2203693cc04e0be7f4f024d5f9499e13/59505a779e87403e919e155bb5f2e6ea/1d045557fc9447f1ae0220bfd0255e4c.jpg

The picked photo path is:
/storage/emulated/0/Android/data/cz.company.myapp/cache/2203693cc04e0be7f4f024d5f9499e13/ee31f7ca8f9641f1b0421b594090df3e/IMG_20210209_091737.jpg

The full exception I'm getting is:

System.ObjectDisposedException: 'Cannot access a disposed object.
Object name: 'System.Net.Http.MultipartFormDataContent'.'

Steps to Reproduce

1. Pick the photo

try
{
    var photo = await MediaPicker.CapturePhotoAsync(new MediaPickerOptions { 
        Title = "Pick a photo"
    });

    if (photo == null)
    {
        return;
    }

    Photos.Add(photo.FullPath);
}
catch (Exception ex)
{
    _logger.LogError(ex, "Taking photo failed");
    return;
}

2. Create to send the files using the MultipartFormDataContent in a HttpRequestMessage

// request is a HttpRequestMessage
using (var formData = new MultipartFormDataContent())
{
    foreach (var filePath in photoPaths)
    {
        formData.Add(new ByteArrayContent(File.ReadAllBytes(filePath)), "files", Path.GetFileName(filePath));
    }
    request.Content = formData;
}

// code left out for simplicity
var response = await client.SendAsync(request);

Expected Behavior

The app doesn't throw any exception and the photo is successfully sent.

Actual Behavior

The app throws the System.ObjectDisposedException exception upon trying to send the files to an API

Basic Information

• Version with issue: 1.6.0
• Last known good version: ?
• IDE: VS Professional 2019 v16.8.4
• Platform Target Frameworks:
  • iOS: 14.3
  • Android: 10.0
  • UWP: none
• Nuget Packages:
  • Xamarin.Forms v5.0.0.1874
  • Xamarin.Essentials v1.6.0
• Affected Devices: Android emulator (API 29)