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csharp-file-based-app

Build, run, and publish .NET applications from a single C# file without a .csproj, using .NET 10 SDK file-based apps. USE FOR: dotnet run file.cs; dotnet run --file; shebang/shell-executable C# scripts; colon-prefixed directives (sdk, package, project, property, include); converting a file-based app to a project with dotnet project convert; publishing file-based apps with native AOT; packaging a file-based app as a .NET tool (PackAsTool); user secrets for file-based apps; flat *.run.json launch profiles; dotnet build/clean/publish/pack/restore on a .cs file; build caching behavior and dotnet clean file-based-apps; folder layout to avoid project-file cone conflicts. DO NOT USE FOR: traditional .csproj solution scaffolding (use dotnet-solution-setup); C# language idioms unrelated to the SDK/CLI (use csharp-best-practices); benchmarking (use dotnet-benchmarking).

日本語の概要は準備中です。原文の説明を表示しています。

NetFabric/NetFabric.Numericsスター 36(GitHub 36 + cccskills 0)

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インストール方法を見る

含まれるファイル（3）

  • SKILL.md4.1 KB
  • references/directives-reference.md2.1 KB
  • references/runtime-behavior.md4.4 KB

SKILL.md（原文）

インストールする前に、エージェントに与えられる指示の中身を確認できます。

C# File-Based Apps

Requires .NET 10 SDK+. Run a single .cs file directly — the SDK generates a virtual project from #: directives, no .csproj needed.

Run, Build, Publish

CommandEffect
dotnet run file.cs / dotnet run --file file.cs / dotnet file.csRun the file-based app
dotnet run file.cs -- arg1 arg2Pass args to the app
echo 'Console.WriteLine(1);' | dotnet run -Run C# piped from stdin
dotnet build file.csBuild; output under <temp>/dotnet/runfile/<name>-<hash>/bin/<config>/
dotnet publish file.csPublish; native AOT by default → artifacts/<name>/ next to the file
dotnet pack file.csPack as a .NET tool; PackAsTool=true by default
dotnet project convert file.csMaterialize a .csproj + copy of the file in a new folder; original untouched
dotnet restore file.csRestore packages (implicit on build/run; skip with --no-restore)
dotnet clean file.csRemove build artifacts for this file
dotnet clean file-based-apps [--days N]Purge stale cached build folders (default 30 days)

Disable AOT: #:property PublishAot=false. Disable tool packaging: #:property PackAsTool=false.

#: Directives

Place at the top of the .cs file, one per line.

DirectivePurposeExample
#:sdkChoose SDK (default Microsoft.NET.Sdk)#:sdk Microsoft.NET.Sdk.Web
#:packageAdd a NuGet package#:package Serilog@3.1.1
#:projectReference another project#:project ../Shared/Shared.csproj
#:propertySet an MSBuild property#:property TargetFramework=net10.0
#:includeAdd extra source/resource files (.NET 11 Preview 3+ / SDK 10.0.300+)#:include helpers.cs

Full syntax, glob patterns, conditional property expressions, item-type mapping → references/directives-reference.md.

Key Behaviors

  • Shell execution: shebang #!/usr/bin/env -S dotnet -- + chmod +x runs the file directly on Unix (LF endings, no BOM).
  • User secrets: stable ID hashed from file path; dotnet user-secrets set "K" "V" --file file.cs.
  • Launch profiles: flat <name>.run.json next to the .cs file; traditional Properties/launchSettings.json wins if both exist.
  • Build caching: keyed on file content, directives, SDK version, implicit build files; concurrent runs of the same app can race on output — dotnet build first, then run with --no-build.
  • Folder layout: never nest a file-based app inside a .csproj's directory cone, and isolate it from ambient Directory.Build.props/Directory.Packages.props when different settings are needed.

Shebang details, secrets/launch-profile examples, caching pitfalls, folder-layout dos/don'ts → references/runtime-behavior.md.

Reference Files

FileLoad When
references/directives-reference.mdWriting/debugging #: directives, glob #:include patterns, conditional #:property expressions
references/runtime-behavior.mdShell execution, user secrets, launch profiles, build caching, folder layout guidance

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