runtime: System.Text.Json: Method not found System.Text.Encodings.Web.TextEncoder.FindFirstCharacterToEncodeUtf8 happening in Xamarin.Android

Description

After updating VS 2022 to 2.1 I am getting a System.MissingMethodException for int System.Text.Encodings.Web.TextEncoder.FindFirstCharacterToEncodeUtf8(System.ReadOnlySpan``1<byte>) when targeting Xamarin.Android. The App builds successfully and once I use ReadFromJsonAsync<>() on my HttpResponseMessage-Content the exception in thrown. But it works with VS 2019 Version 16.10.4.

I know that there were issues for iOS and MacOs open in this repo, but I couldn’t find one for Android, so I guess, this is related to https://github.com/dotnet/runtime/issues/49211

About this issue

Original URL
State: closed
Created 3 years ago
Reactions: 4
Comments: 30 (22 by maintainers)

Most upvoted comments

I can reproduce the issue using @codedbycurtis repo, thank you!

akoeplinger on Oct 6, 2021

Actually scratch that, looks like that was a red herring. The real issue is XAML Hot Reload. If you turn off XAML Hot Reload in VS settings then it should work.

akoeplinger on Nov 16, 2021

A new report from VS Feedback:

Sumit Gupta posted on Oct 6, 2021:

I have a Xamarin.Forms 5 App, that use Plugin.Notification (from Github) and we get error same error (randomly, not always) when compiled through VS 2022, Preview 4.1 but it works fine in VS 2019.

As suggest we do have System.Memory, 4.5.4 and System.Buffers included in projects. But that doesn’t help in Preview Edition. Surely it is compiler not linking files properly.

CarnaViire on Oct 6, 2021

I do think there’s still a product concern here, my suggestion was just a workaround. @marek-safar who can check that the fixes that @filipnavara made to the Xamarin targeting packs are still working correctly in VS2022? Seems like this might important for the 6.0 release. cc @akoeplinger @steveisok

ericstj on Aug 25, 2021