With .NET 10, Microsoft introduced file-based apps, which give you the ability to write C# code in a single .cs file and run it directly, without any project or solution files. This feature finally makes C# approachable for quick scripts and utilities

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Milan Jovanović

.NET 10 introduces file-based apps, allowing developers to write and execute C# code in a single .cs file without project or solution files. This feature enables quick scripting scenarios while maintaining C#'s type safety, performance, and access to NuGet packages through special #: directives. Developers can create utilities, data processing scripts, and even Aspire AppHost configurations in single files, with the option to convert to full projects when needed. The feature addresses C#'s traditional ceremony overhead, making it more competitive with scripting languages for quick tasks and prototyping.

Exploring C# File-based Apps in .NET 10

Real-world Example: Quick Data Processing

Building Something More Ambitious with Aspire

<p>I am very excited about this feature, and I cannot wait for my workplace to finally upgrade to .NET 10 to try this out fully!</p>
