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i am creating an app in xamarin using .Net Standard so far i have installed following Nuget packages in my solution

PCL/.Net Standard packages

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Android packages

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Min SDK level is Android 5.1 and max is Android Oreo 8.1.

When i run the app in visual studio VS2017 it runs for few seconds and closed down abruptly and throwing following error 

04-06 02:45:11.182 6262-6262/com.org.sam A/monodroid-assembly: Could not load assembly 'System.Runtime.CompilerServices.Unsafe' during startup registration.
04-06 02:45:11.182 6262-6262/com.org.sam A/monodroid-assembly: This might be due to an invalid debug installation.
04-06 02:45:11.182 6262-6262/com.org.sam A/monodroid-assembly: A common cause is to 'adb install' the app directly instead of doing from the IDE.

  1. i tried cleaning the solution many times and removing bin and obj folders too but i am getting the same error.

  2. I have not written any code anywhere as i am just migrating the project so this project is blank.

I personally think Realm has the System.Runtime.CompilerServices reference and due to that its creating issue. here is the screenshot of realm installing from nuget

enter image description here

Hunt
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2 Answers2

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I also had this error, but it was when using Entity Framework from a .net standard library. This took quite a while to sort out! Hopefully this will work for you.

In the android project add the following as an XmlFile eg(UnsafeCompilerWorkaround.xml):

<Project>
  <Target Name="ReplaceRefAssemblies" AfterTargets="_ResolveAssemblies">
    <ItemGroup>
      <ResolvedAssembliesFixedWindows Include="@(ResolvedAssemblies->Replace('\ref\','\lib\'))" />
      <ResolvedAssembliesFixedUnix Include="@(ResolvedAssemblies->Replace('/ref/','/lib/'))" />
      <ResolvedAssembliesFixed Include="@(ResolvedAssembliesFixedWindows)" Condition="@(ResolvedAssembliesFixedWindows) != @(ResolvedAssemblies)" />
      <ResolvedAssembliesFixed Include="@(ResolvedAssembliesFixedUnix)" Condition="@(ResolvedAssembliesFixedUnix) != @(ResolvedAssemblies)" />
      <ResolvedAssemblies Remove="@(ResolvedAssemblies)" />
      <ResolvedAssemblies Include="@(ResolvedAssembliesFixed)" />
    </ItemGroup>
  </Target>
</Project>

Edit the android.csproj file and add the following import

  <Import Project="UnsafeCompilerWorkaround.xml"></Import>

Then clean and rebuild the solution.

App Pack
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This is a known issue in Xamarin.Android. As far as I know, at this time the only known workaround is to use packages.config instead of <PackageReference> when referencing from NuGet.

It should be fixed soon by #1356, hope this can help you. :)

York Shen
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  • for android it worked but for iOS it didnt worked , do you have any workaround for iOS – Hunt Apr 25 '18 at 09:13
  • @Hunt, sorry, I know a little about iOS. But I think you could create a new question about this, there will be someone to help you to resolve this issue. :) – York Shen Apr 26 '18 at 09:15