Random Typeload exception regarding httpclient

Question

Random Typeload exception regarding httpclient

lufo88 1

Hi,

I am struggling with a problem in my app which I developed about one year ago with Xamarin.Android
After the last release (mid-january 2021) in appcenter.ms appears random typeload Exception about the namespace System.net.http
The error are like these:
System.TypeLoadException: Could not set up parent class, due to: Could not load type of field 'System.Net.Http.HttpClientHandler:"
System.TypeLoadException: Could not set up parent class, due to: Could not load type of field 'System.Net.Http.HttpClientHandler:<DangerousAcceptAnyServerCertificateValidator>

Note I didn't use DangerousAcceptAnyServerCertificateValidator.

All error seems unrelated to my code, but rather refer to the framework itself and appear at random regarding the brand or the android version.
I tried to simulate the problem, but with no luck. It seems it appear only in release build.

Can you help me?

JarvanZhang 23,971 Reputation points

2021-02-03T14:31:50.747+00:00

After the last release (mid-january 2021) in appcenter.ms appears random typeload Exception about the namespace System.net.http

Hi, lufo88-9613. What release did you face the issue? If it's about appcenter sdk, please report the issue to the product team on github for help.

https://github.com/microsoft/appcenter-sdk-dotnet/issues
lufo88 1 Reputation point

2021-02-03T14:38:48.887+00:00
Hi,

I'm sorry for the misunderstanding.
I talk about the release of my app. :-)

To rephrase tnhe entire question:

An year ago I developed an app with Xamarin.Android and I use appcenter as system for tracking crash and so on

I updated various time the app without problem

In mid-january I release a new version of the app. I made a small change, I didn't touch the part where I use httpclient.

Since then I see these random crashes through appcenter.ms

regards
JarvanZhang 23,971 Reputation points

2021-02-03T14:56:44.297+00:00

What functions do you update in the lastest release? Could you post some details about that? Such like the build version and package versions.
lufo88 1 Reputation point

2021-02-03T15:08:01.133+00:00
In my code:
I simply rewrite a single line to retrieve a color from my resource.
Before:
var color = Context.GetColor(idColor);
Now:
var color = new Color(ContextCompat.GetColor(Context, idColor));
(the first one is not available in previous android version)

That's it.
The big differences between the two release of the app are:

I update all the Xamarin.AndroidX packages (minor versions)

I update also the target framework (from Android Q to Android R)

That's why I suspect there is something wrong in the framework.
I make no other changes.
JarvanZhang 23,971 Reputation points

2021-02-04T08:18:09.2+00:00

It seems it appear only in release build.

Will the project work well in release mode locally? Please test it on your side to check that.

I update all the Xamarin.AndroidX packages (minor versions)

Do you mean the preview versions? The preview version may try to make some changes that may cause potential problems. Please use the latest stable version for testing.
lufo88 1 Reputation point

2021-02-04T11:01:07.61+00:00

Will the project work well in release mode locally? Please test it on your side to check that.

Same behavior. The problem seems random.
In debug I perform the same actions and nothing wrong happens. The app works without problem.
in other words:
Debug ---> work
Release in local ---> random typeload exception
Release through play store ---> random typeload exception

Do you mean the preview versions?

No, I only use the stable version of every package I use.
JarvanZhang 23,971 Reputation points

2021-02-04T14:53:25.053+00:00

What's the value of the linker option? Try to set it to None or Sdk Assemblies Only for test.
lufo88 1 Reputation point

2021-02-04T14:55:26.94+00:00

I will try it thanks.
Normal is "none" for debug and "Sdk Assemblies Only" for release
JarvanZhang 23,971 Reputation points

2021-02-05T14:39:15.173+00:00

Waiting for your update.
lufo88 1 Reputation point

2021-02-08T09:50:06.417+00:00
I deleted my previous comments because I found out that's not the problem. So Microsoft.AppCenter is not the culprit.

However I found when these crashes happens (only in release mode, I tried your suggest in debug mode, but I have no luck).

Install the app trough visual studio.

Start it and use some functions which required HttpClient (login)

tyepload exception (it's not happens always! 9 of 10 of my try happens)

If I kill the app (also from in background) or if I reinstall it from Visual studio the problem disapper.