Runtime Error in Microsoft.Azure.Devices.Client on Xamarin Android

[sgmbh]

• OS and version used: Windows 10
  

• SDK version used: Android 8.0

• Xamarin.Forms version used: 2.5.0.122203 (edit: 2.5.0.280555)

• Microsoft.Azure.Devices.Client version used: 1.6.2 (edit: 1.7.0)

Description of the issue:

Steps to reproduce the error:
New Cross-Platform App (Xamarin.Forms) > Blank App > Platform (Android & iOS) > UI Technology (Xamarin.Forms) > Code Sharing Strategy (.NET Standard) > OK

On Solution > Manage Nuget Packages for Solution... > Add "Microsoft.Azure.Devices.Client"

Build & run on Android Device (Nexus 5S) with Android 8.0 > it looks like the app will start, but it will crash at startup.

Edit 15. Feb. 2018: Build & run on iOS Device (iPhone 8) with iOS 11 works.

Code sample exhibiting the issue:

see description

Console log of the issue:

Build Log:
buildlog.txt

Smartphone Log:
fulllog.txt

[sdebruyn]

Same here.
Probably related to the following:

• https://github.com/dotnet/corefx/issues/26203
• System.Threading.Overlapped fails to install in a Xamarin project dotnet/core#1269
• Unable to Install System.Threading.Overlapped xamarin/xamarin-macios#3138

[sgmbh]

I'm not sure if this is the same? It looks like this three problems are somehow related to visual studio for mac?
Perhaps it's something like this? But I'm not sure...
xamarin/xamarin-android#1196
xamarin/xamarin-android#1154
Microsoft/msbuild#2776

[arturl]

I see the same behavior. Merely adding Microsoft.Azure.Devices.Client package v1.6.2 causes the app to crash at startup. The log:

02-18 18:27:45.744 D/Mono    ( 5347): Assembly Loader probing location: 'System.Runtime.CompilerServices.Unsafe'.
02-18 18:27:45.744 F/monodroid-assembly( 5347): Could not load assembly 'System.Runtime.CompilerServices.Unsafe' during startup registration.
02-18 18:27:45.744 F/monodroid-assembly( 5347): This might be due to an invalid debug installation.
02-18 18:27:45.744 F/monodroid-assembly( 5347): A common cause is to 'adb install' the app directly instead of doing from the IDE.

[benclerix-cegeka]

Can you give an ETA or workaround on this?

[CIPop]

@benclerix-cegeka At the moment this seems to be a Xamarin compiler issue.
We need more time to create a new sample using the latest templates and see if we can somehow work-around the issue. Unfortunately I can't say when that's going to be ready...

[benclerix-cegeka]

@CIPop Ok thanks for the fast feedback!

[jfversluis]

A workaround seems to be to set the Linker option to "Sdk and User assemblies" under the Android options in the properties of the Droid project. Not sure what the reason is but the System.Runtime.CompilerServices.Unsafe.dll doesn't seem to be copied to the output folder, maybe other binaries as well.

Copying them manually, packing the APK and deploying it should probably work as well.

[sgmbh]

@jfversluis it looks like it's a workaround for some projects. In my "steps to reproduce"-project the app didn't crash anymore. But in my real app I get now "The LinkAssemblies task failed unexpectedly". I look into that, perhaps I find a fix for that.

[jfversluis]

@sgmbh it seems to be a trade-off indeed and not working for all projects. I found the same issue in several other places with a couple of workarounds, see the links underneath.

https://developercommunity.visualstudio.com/content/problem/152947/xamarin-android-run-error-could-not-load-assembly.html

dotnet/efcore#8922 (comment)
(scroll down for more possible solutions)

[sgmbh]

Thanks @jfversluis for this links. Actually I tried exactly this steps before because I also saw this error : "System.Runtime.CompilerServices.Unsafe" (third last line in my fulllog file). Although I don't use Entity Framework, it looks like the problem seems related.

[benclerix-cegeka]

Following solution worked for me: dotnet/android#1196 (comment).

[sgmbh]

@benclerix-cegeka I tried your workaround but unfortunately I get the same error "link assemblies task failed" in a slightly other way:

The "LinkAssemblies" task failed unexpectedly.
System.IO.FileNotFoundException: Could not load assembly 'System.Security.Cryptography.ProtectedData, Version=4.0.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'. Perhaps it doesn't exist in the Mono for Android profile?
File name: 'System.Security.Cryptography.ProtectedData.dll'

[cheles]

I can confirm that latest vs 15.7 with XF 3.0.0.446417 fixed this issue.

[sgmbh]

I can also confirm that with the following version this issue is fixed:
Visual Studio 15.7.1
Xamarin.Forms 3.0.0.482510
Microsoft.Azure.Devices.Client 1.7.1