Skip to main content

Nullable reference types–Using the required keyword in C# 11

A few years ago with the introduction of Nullable Reference Types in C# 8, I blogged about a way to get rid of the CS8618 compiler warning for your DTO’s and ViewModels. The trick I shared was to use a a property assignment with a default literal:

Although this  solution works it defeats the point of nullable reference types, as the idea is it would help you to get rid of unexpected NullReferenceExceptions. Instead the only thing you got is a compiler that no longer complaints.

With the release of C# 11, a better solution exists through the usage of the required modifier.

The required modifier indicates that the field or property it's applied to must be initialized by all constructors or by using an object initializer.

Let’s update our code:

Now the compiler expects that the property is always set, so the compiler warning disappears.

Remark: The required modifier is enforced at compile time. So it is still possible that we end up with a NullReferenceException when for example the object is created through deserialization of a JSON document.

Labels:

Popular posts from this blog

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

.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

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