Skip to main content

TFS Build: The assembly has already loaded from a different location

When trying to run a build on a build server, the unit tests failed with the following error message:

API restriction: The assembly ‘someassembly.dll' has already loaded from a different location. It cannot be loaded from a new location within the same appdomain.

This error is caused by a combination of 2 elements. First the solution that I’m trying to build contains a web application. As a consequence the binaries are available at 2 locations; the binaries folder itself but also inside the _PublishedWebsites directory that is created beneath the Binaries folder during a team build.

The second thing is that I’m using the default Test pattern to search for Test assemblies: **\*test*.dll. This pattern indicates that the build engine will search for test assemblies containing the word ‘test’ in the binaries folder AND all subfolders.  As we have 2 places where the same assembly is found(the Binaries folder and the  _PublishedWebsites\Project\bin folder), we are getting into trouble.

defaulttestpattern

So we have to change the default search pattern from **\*test*.dll to *test*.dll. This will disable the recursive search.

changedtestpattern

Popular posts from this blog

.NET 8–Keyed/Named Services

A feature that a lot of IoC container libraries support but that was missing in the default DI container provided by Microsoft is the support for Keyed or Named Services. This feature allows you to register the same type multiple times using different names, allowing you to resolve a specific instance based on the circumstances. Although there is some controversy if supporting this feature is a good idea or not, it certainly can be handy. To support this feature a new interface IKeyedServiceProvider got introduced in .NET 8 providing 2 new methods on our ServiceProvider instance: object? GetKeyedService(Type serviceType, object? serviceKey); object GetRequiredKeyedService(Type serviceType, object? serviceKey); To use it, we need to register our service using one of the new extension methods: Resolving the service can be done either through the FromKeyedServices attribute: or by injecting the IKeyedServiceProvider interface and calling the GetRequiredKeyedServic...

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.

Kubernetes–Limit your environmental impact

Reducing the carbon footprint and CO2 emission of our (cloud) workloads, is a responsibility of all of us. If you are running a Kubernetes cluster, have a look at Kube-Green . kube-green is a simple Kubernetes operator that automatically shuts down (some of) your pods when you don't need them. A single pod produces about 11 Kg CO2eq per year( here the calculation). Reason enough to give it a try! Installing kube-green in your cluster The easiest way to install the operator in your cluster is through kubectl. We first need to install a cert-manager: kubectl apply -f https://github.com/cert-manager/cert-manager/releases/download/v1.14.5/cert-manager.yaml Remark: Wait a minute before you continue as it can take some time before the cert-manager is up & running inside your cluster. Now we can install the kube-green operator: kubectl apply -f https://github.com/kube-green/kube-green/releases/latest/download/kube-green.yaml Now in the namespace where we want t...