Skip to main content

NSwag error - System.InvalidOperationException: No service for type 'Microsoft.Extensions.DependencyInjection.IServiceProviderFactory`1[Autofac.ContainerBuilder]' has been registered.

In one of our projects we are using NSwag to generate our TypeScript DTO’s and services used in our Angular frontend. In this project we are using Autofac as our IoC container and have created a few extension methods that hook into the HostBuilder bootstrapping.

Unfortunately our custom logic brought NSwag into trouble and caused our build to fail with the following error message:

System.InvalidOperationException: No service for type 'Microsoft.Extensions.DependencyInjection.IServiceProviderFactory`1[Autofac.ContainerBuilder]' has been registered.

NSwag adds an extra build target in your csproj file and uses that to run the NSwag codegenerator tool:

While investigating the root cause of this issue, we introduced a small workaround where we used a separate program.cs and startup.cs specifically for the NSwag codegenerator.

We added a minimal Program.cs file:

And a minimal Startup.cs file:

The magic to make this work is to change the nswag.json configuration file in the root of our project and point to the alternative files we’ve created above:

"createWebHostBuilderMethod": "Example.App.Web:Example.App.Web.NSwag.NSwagProgram.FakeNSwagHostBuilder",

"startupType": "Example.App.Web:Example.App.Web.NSwag.NSwagStartup",

Although this is not a final solution, until I found the exact root cause, this will do the trick...

Labels:

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...
Read more

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.
Read more

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...
Read more