Dotnet

Railpack builds and deploys Dotnet applications with zero configuration.

Detection

Your project will be detected as a Dotnet application if a *.csproj file

Versions

The Dotnet version is determined in the following order:

• Read TargetFramework from the first *.csproj file found in the project
• Read version from the global.json file in the project root
• Set via the RAILPACK_DOTNET_VERSION environment variable
• Defaults to 6.0.428

Configuration

Railpack builds your Dotnet application based on your project structure. The build process:

• Installs Dotnet SDK and Runtime
• Caches dependencies using dotnet restore
• Builds the project using dotnet publish --no-restore -c Release -o out
• Sets up the start command based on the publish output ./out/{project_name}

Config Variables

Variable	Description	Example
RAILPACK_DOTNET_VERSION	Override the Dotnet version	6.0.428

Runtime Packages

The libicu-dev package is installed to support internationalization in your Dotnet applications.

Port Binding

Railpack automatically configures your application to listen on the port specified by the PORT environment variable (defaulting to 3000).

This is achieved by setting the ASPNETCORE_URLS environment variable in the start command: ASPNETCORE_URLS=http://0.0.0.0:${PORT:-3000}.

This ensures the application listens on all network interfaces (0.0.0.0) rather than just localhost, making it accessible externally.