Getting “This assembly was expected to be in the local runtime” store when publishing to a Docker service

After having updated some ASP.NET Core Nuget packages, this may happen on the target Docker container instance:


This can be solved by editing the project file to include:


This makes the dotnet publish to bundle all the required files.

Can’t set break point in .NET Standard (std) library

Always hitting this issue when trying to set a debug break point in a shared .NET Std class library:


Here’s the workaround, edit the .NET Std Class Library Project file and add:


Run MongoDB in a Docker container on Docker for Windows

Just a note to self on how to run a MongoDB instance using Docker for Windows.

Create a volume to persist the Mongo database:



The run a MongoDB instance:


Unsupported class version number [52.0] (maximum 51.0, Java 1.7)

Xamarin Android Unsupported class version issues

When doing Xamarin Android development, you may have come across the error message after enabling MultiDex:


This is most likely because of an older ProGuard installation.

Download the latest ProGuard from here (v5.3.3 as of this writing).

Determine the current Android SDK location that Xamarin is using by checking Tools->Options->Xamarin->Android Settings.

In my case it is C:\Users\Magnus\AppData\Local\Android\android-sdk.

So here is how to to so update the Proguard installation;

In the tools sub folder, rename the current proguard to proguard.old.

Extract the contents of the latest ProGuard zip file to a folder named proguard.

That should do it. Just remember that any changes in the SDK installation (using the Android SDK Manager) will put back the older version, so repeat this after an SDK update.

How to use JRE/JDK v8 with Android Studio v2

I was struggling with a rendering exception in Android Studio v2
Failed to load the LayoutLib: com/android/layoutlib/bridge/Bridge : Unsupported major.minor version 52.0

Apparently this can be fixed by telling Android Studio to use JRE v8 (for the IDE, not compiling).
One could edit the plist to tell Android Studio to use a different JRE than the default v6, but that’s not recommended by Google.

So here’s a workaround; create a shortcut/alias that exports a value to use JRE v8.

Save this to a .command file, for example LaunchAndroidStudio.command:
export STUDIO_JDK=/Library/Java/JavaVirtualMachines/jdk1.8.0_77.jdk
open /Applications/Android\

Change the icon for the alias.
Open the contents of /Applications/Android
Navigate to /Contents/Resources and double click the AndroidStudio.icns, it will open in Preview
Copy the icon (Command+C)
Open the LaunchAndroidStudio.command by the “Get Info” command.
Click the default icon in the top left corner and past the icon (Command+V)