To use the Regex source generator, you need to use .NET 7 and C# 11. Source Generated Regex provides multiple advantags over the traditional regex: Faster startup time as the all the code is generated at compile time. You don't need to parse the regex pattern and generate an optimized code to execute the regex at runtime. Better trimming support as the code is generated at compile time. The code that is… [read more]

I' ve already written about mocking an HttpClient using an HttpClientHandler. You can write the HttpClientHandler yourself or use a mocking library. There are multiple NuGet packages that can help you writing the HttpClientHandler such as Moq, RichardSzalay.MockHttp, HttpClientMockBuilder, SoloX.CodeQuality.Test.Helpers, WireMock.Net, etc. Here's an example of MockHttp: var mockHttp = new… [read more]

Blazor WebAssembly allows to run a .NET web application in a browser. Starting with .NET 7, you can easily run any .NET method from JavaScript without needing the whole Blazor framework. Let's see how to run a .NET method from JavaScript! First, you need to install the WASM workload, so you can publish the app later: dotnet workload install wasm-tools Then, you can create a new console app: dotnet new… [read more]

The International Components for Unicode (ICU) is a set of libraries that provide Unicode and internationalization support for software applications. Unicode is a standardized encoding system that represents almost all of the written languages of the world. It is used to represent characters in computers, mobile devices, and other digital devices. ICU provides a wide range of functions for working with… [read more]

I've already talked about preventing breaking changes in the post I fixed a bug. What should I do now?. But technics evolves, and now the .NET SDK provides new features to help NuGet package authors to detect breaking changes between two versions of a NuGet package when building a new version. Starting with .NET 6, the .NET SDK provides a new feature called Package Validation that allows NuGet package… [read more]

C# 11 introduced list patterns. List patterns extend pattern matching to match sequences of elements in a list or an array. The goal of this post is not to explain the syntax, but to show how to create a compatible type. If you don't know what list patterns are, I recommend reading the following documentation which contains many examples: List patterns documentation. Here're some examples: var array =… [read more]

I've recently added a dark theme to this website. The light or dark theme is selected based on the browser / OS settings. In this post, I'll describe how I've added this support! Theme is selected based on browser settings Step 1: Extracting colors to variables The first step is to extract all colors to variables. While this is not mandatory, it simplifies the creation of the dark them. Indeed, you will… [read more]

I recently investigated an issue where the tests hang on the CI. It's easier to debug when issues happen on your machine as you can easily attach a debugger and see what's going on. But in this case, the tests were hanging on the CI and I couldn't attach a debugger. I had to find an alternative way to debug the issue. dotnet test has many useful options. One of them is --blame-hang which allows to take a… [read more]

Google Chrome and Microsoft Edge provide a store to publish extensions. Extensions published on the store are validated by testers, so you know the quality is ok and the extension does what is the description explains. However, there is no staging environment before publishing a new version. Also, you cannot publish a personal extensions not testable by other people. What you can do is to create a private… [read more]

This blog post is part of The C# Advent Calendar, a series of 50 posts about C#. Be sure to check out the rest of the blog posts in the calendar! Flakiness in unit tests refers to the tendency of a test to sometimes pass and sometimes fail, even when there has been no change to the code being tested. This can happen for a variety of reasons, but the end result is that the test is not reliable, and cannot… [read more]