Single file C# Applications are Here!
In .NET 10, Microsoft introduced one of the most exciting quality-of-life features C# has seen in years: file-based apps . If you’ve ever wished C# development felt more like Python—instant scripts, no boilerplate, no projects—this new model was built for you. File-based apps let you write a single .cs file, run it immediately with dotnet run , and skip the ceremony of projects, folders, .csproj files, and startup templates. It’s C#, but with a scripting-first mindset. In this article, we’ll break down: What file-based apps are Why Microsoft built them How they help onboard developers faster How they compete with Python-style scripting workflows How to use packages, properties, and project metadata Limitations of file-based apps How to make them executable on macOS and Linux Step-by-step setup and examples What Are File-Based Apps? File-based apps are standalone C# programs written entirely in a single file , without needing: A csproj A project folder s...