Skip to main content

Feature ‘default literal’ is not available in C# 7.0.

On one of my projects we are ‘default literals’, one of the features introduced in C#7.1.  To be able to use this, you have to change your project properties to point to the latest minor version(more information here: https://bartwullems.blogspot.com/2017/09/how-to-start-using-c-71.html). Unfortunately on the build server it didn’t work as expected, but got the following error in our build logs:

error CS8107: Feature ‘default literal’ is not available in C# 7.0. Please use language version 7.1 or greater.

The strange this was that on the same build server,  another build using the same feature did succeed. So it couldn’t be linked to the possibility that C# 7.1 was not installed on the build server.

Then I got some inspiration, maybe it was related to the Build Configuration. And indeed when I switched from Debug to Release the problem appeared in my Visual Studio as well:

clip_image002

When enabling C# 7.1 for this project, a <langversion> is introduced in the csproj file:

<langversion>latest</langversion>

The problem was that this line was set inside a conditional propertygroup:

<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">

   <langversion>latest</langversion>

</PropertyGroup>

By moving the <langversion> to another propertygroup(without a conditional) the problem was solved.

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...