Feature switches / Feature flags

This is an example solution which demonstrates how to use features switches / features flags in .NET 9. The solution uses both the Microsoft approach to feature flags as well as the OpenFeature NuGet package which you can find here: OpenFeature.dev.

The article

The blog article for this solution is located at https://rafalbielec.com/blog/02_feature_switches.

API URLs

• http://localhost:8080 // The API which uses the Microsoft.FeatureManagement NuGet package.
• http://localhost:8000 // The API to provide flags for the OpenFeature client.
• http://localhost:8001 // The client project which uses the custom OpenFeature API provider.
• http://localhost:8080/openapi/v1.json // OpenAPI JSON spec for the FeatureSwitches project.
• http://localhost:8001/openapi/v1.json // OpenAPI JSON spec for the OpenFeature client API.

How to run

cd src
dotnet restore
dotnet build
dotnet run --project FeatureSwitches
dotnet run --project OpenFeatureApp
dotnet run --project OpenFeatureProvider

IL disassemblers to check compiler trimming

AvaloniaILSpy IlDasm2

MultiRun helper tool to run multiple projects at once with one command

git clone https://github.com/zacharyMcSweenManickchand/MultiRun.net.git
cd MultiRun.net
dotnet build -c Release && dotnet pack -c Release
dotnet tool install --global --add-source ./nupkg mrn --version 1.0.0
mrn .