While trying out C# 12 features, it’s possible you might come across errors similar to these: Feature is not available in C# 11.0. Please use language version 12.0 or later. or Error CS8652: The feature ‘<feature name>’ is currently in Preview and unsupported. To use Preview features, use the ‘preview’ language version. There are two…

Starting with C# version 12, you can specify default values for your parameters in lambda expressions. The syntax and the restrictions on the default parameter values are the same as for methods and local functions. Let’s take an example: This lambda can now be consumed as follows: params array in lambda expressions You can also…

All right folks, generic attributes are finally a thing in C#! 🥳 You can define one just as you would define any other generic class: And use it like you would use any other attribute: Generic attribute restrictions When applying the attribute, all the generic type arguments must be provided. In other words, the generic…

The file modifier restricts a type’s scope and visibility to the file in which it is declared. This is especially useful in situations where you want to avoid name collisions among types – like in the case of generated types using source generators. A quick example: In terms of restrictions we have the following: On…

C# 11 introduces the concept of raw string literals to the language and with that come a set of new features for string interpolation as well. First of all, you can continue to use the interpolation syntax as you know it in combination with raw string literals like this: The output will be: Escaping braces…

Raw string literals are a new format which enables you to include whitespace, new lines, embedded quotes, and other special characters in your string, without requiring escape sequences. How does it work: A quick example: This will output the following: Whitespace before the closing sequence The whitespace before the closing double-quotes controls the whitespace which…

Feature is not available in C# 10.0. Please use language version 11.0 or later. There are two ways to approach this: Language version is greyed out and cannot be modified The Language version cannot be changed from the Properties window of the project. The version is linked to the target .NET framework version of your…

.NET 6 introduced a few new helper methods to deal with throwing exceptions, and one of them is ThrowIfNull. The usage is simple: The method will throw a ArgumentNullException when myParam is null. It will do nothing otherwise. ThrowIfNull can take in two parameters: Note: paramName uses CallerArgumentExpressionAttribute to retrieve the name of your parameter…

In order to retrieve an embedded resource in .NET Core, we first need to understand how the resource name is composed. It’s got 3 elements, all joined by dots (.): Let’s take a concrete example. We have a project (assembly) with a root namespace MyApp.Core. Inside our project we’ve got a folder + subfolder like…