What problem does it solve? Writing and testing a small C# program normally requires creating a full project with a .csproj file, boilerplate structure, and build configuration. This Skill lets you run a single .cs file directly with the dotnet CLI, making quick experimentation, prototyping, and concept testing fast and friction-free. ## Core Features & Use Cases - File-Based App Execution: Run a single .cs file with top-level statements using dotnet hello.cs, with automatic build caching for fast subsequent runs. - NuGet Package References: Add packages inline with the #:package PackageName@Version directive, no project file needed. - AOT-Safe JSON Serialization: Guidance for source-generated JSON with JsonSerializerContext, since file-based apps enable native AOT by default. - Fallback for Older SDKs: A temporary console project workflow for .NET 9 and earlier, plus a conversion path to a full project via dotnet project convert. - Use Case: You want to verify how a LINQ query or a new API behaves. Write a 10-line .cs file, run it with dotnet file.cs, inspect the output, and delete the file when done. ## Quick Start Ask the AI to write and run a single-file C# script that demonstrates the concept or logic you want to test.
