Skip to main content

warning SYSLIB1037: The type '' defines init-only properties, deserialization of which is currently not supported in source generation mode.

2 days ago I introduced the System.Text.Json source generator and showed you how to use it in ASP.NET Core. What I didn’t told you that it didn’t go so smoothly.

If you had a good look at the generated code I shared, you maybe noticed the following lines:

The generated setter on the property will not work and instead throw an InvalidOperationException.

This also appears as a warning during the build process:

CSC : warning SYSLIB1037: The type 'OrderDto' defines init-only properties, deserialization of which is currently not supported in source generation mode.

More information about this warning: https://docs.microsoft.com/en-us/dotnet/fundamentals/syslib-diagnostics/syslib1037

The reason is that my OrderDto is a record type using init-only properties:

There is not much we can do to fix this else then switching to mutable properties:

I searched around further on the web about this issue and found the following related Github issues:

The good news that Microsoft is looking into this issue and that maybe a solution will be provided in .NET 7.

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