Skip to main content

C# 10–Global using

I continue my journey in discovering possibilities of the ‘using’ keyword and arrive at an upcoming feature in C# 10: global using directives.

C# 10.0 allows you to define using directives globally, so that you don’t have to write them in every file. Let’s take a look at a simple example.

I created a GlobalUsings.cs class in my project and added the following 2 lines:

By doing this the 2 namespaces above are available in every C# file in my project.

Remark: In this example I’ve put my global usings in a seperate file. This isn’t necessary, you can put the global usings in any code file, although I would recommend isolating it to make them easier to discover and maintain.

Now I can simplify my Program.cs file:

You can combine this feature with the using static as well:

This allows me to even further simplify my Program.cs file:

More information: https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/using-directive#global-modifier
Labels:

Popular posts from this blog

Podman– Command execution failed with exit code 125

After updating WSL on one of the developer machines, Podman failed to work. When we took a look through Podman Desktop, we noticed that Podman had stopped running and returned the following error message: Error: Command execution failed with exit code 125 Here are the steps we tried to fix the issue: We started by running podman info to get some extra details on what could be wrong: >podman info OS: windows/amd64 provider: wsl version: 5.3.1 Cannot connect to Podman. Please verify your connection to the Linux system using `podman system connection list`, or try `podman machine init` and `podman machine start` to manage a new Linux VM Error: unable to connect to Podman socket: failed to connect: dial tcp 127.0.0.1:2655: connectex: No connection could be made because the target machine actively refused it. That makes sense as the podman VM was not running. Let’s check the VM: >podman machine list NAME         ...
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

Cleaner switch expressions with pattern matching in C#

Ever find yourself mapping multiple string values to the same result? Being a C# developer for a long time, I sometimes forget that the C# has evolved so I still dare to chain case labels or reach for a dictionary. Of course with pattern matching this is no longer necessary. With pattern matching, you can express things inline, declaratively, and with zero repetition. A small example I was working on a small script that should invoke different actions depending on the environment. As our developers were using different variations for the same environment e.g.  "tst" alongside "test" , "prd" alongside "prod" .  We asked to streamline this a long time ago, but as these things happen, we still see variations in the wild. This brought me to the following code that is a perfect example for pattern matching: The or keyword here is a logical pattern combinator , not a boolean operator. It matches if either of the specified pattern...
Read more