async void methods are not a good way to define async methods. You should return a Task or ValueTask instead. The main point is to be able to await the method. But, is it possible to await an async void method? I don't say you should use async void in your code, I'm just questioning the point of not being able to await them... When you create an async void method, the compiler generates code for you. You… [read more]

GitHub Actions supports sharing data between jobs in any workflow as artifacts. This is very convenient but the storage is limited (or you have to pay for it). If you use too much storage, you may get one of those notifications: You've used 75% of included services for GitHub Storage (GitHub Actions and Packages) One way to free storage space is to delete GitHub Actions artifacts. You can do it manually,… [read more]

What's HTTP/3? HTTP/3 is a new version of HTTP. HTTP/3 protocol is supported by most modern browsers and servers. This update should bring performance benefits mostly for mobile users or unreliable connections. The main idea is to replace TCP by a new protocol, QUIC, which removes some issues of TCP for HTTP. So, QUIC has the following advantages (not exhaustive list): Faster connection set-up by… [read more]

When a user reports an error in a Roslyn Analyzer or a Source Generator, you may need to know the version of Roslyn and the language version that are currently being used. The compiler provides everything needed. Indeed, you simply need to add #error version to any source file and check the compiler output: #error version // ... rest of the file ... The error message CS8304 will contain the version of… [read more]

I often see code that uses File.Exists(path) before opening/writing the file. This pattern is very suspect and may leads to unexpected bugs. Let's consider the following code: if (File.Exists(path)) { using var stream = File.Open(path, FileMode.Open); // Is it safe? // ... } There are multiple reasons for the previous code to fail. Indeed, other applications running on the machine could change the file… [read more]

note: 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! System.Collections.Generic.List<T> may be the most used collection in .NET. It is a generic collection that can be used to store any type of data. In this post, we'll see the different ways to enumerate a List<T>. There are multiple ways to enumerate a… [read more]

To use Playwright, you need to install the NuGet package and the browsers. The documentation tells us to use the following command to install the browsers: # Create project dotnet new console -n PlaywrightDemo cd PlaywrightDemo # Install dependencies, build project and download necessary browsers. dotnet add package Microsoft.Playwright dotnet build dotnet tool install --global Microsoft.Playwright.CLI… [read more]

File Scoped Namespace is a new feature of C# 10. The idea is to remove one level of indentation from source files when they contain only one namespace in it. The goal is to reduce horizontal and vertical scrolling and make the code more readable. namespace MyProject { class Demo { } } // File Scoped Namespace namespace MyProject; class Demo { } Most of the files have only one namespace, so File Scoped… [read more]

note: The samples in this post instrument an ASP.NET Core application, but you can instrument any kind of application using OpenTelemetry What is OpenTelemetry? OpenTelemetry is a set of APIs, SDKs, tooling and integrations that are designed for the creation and management of telemetry data such as traces, metrics, and logs. The project provides a vendor-agnostic implementation that can be configured to… [read more]

Uploading files may take times. The users want to have visibility on what's happening, so it is good to show them about the progress. The simplest way to do it is to show a progress bar. In this post, we'll use the InputFile component to upload files and some custom code to show the progress bar. The result looks like this: Blazor comes with the InputFile component. This component allows you to upload… [read more]