Note

This guide applies to Steeltoe v3. Please open an issue if you'd like to help update the content for Steeltoe v4.

Application Configuration Placeholders

This tutorial takes you through setting up a .NET Core application that uses placeholders for config values.

Note

For more detailed examples, please refer to the Placeholder project in the Steeltoe Samples Repository.

First, create a .NET Core WebAPI that has a placeholder implemented

1. Create a new ASP.NET Core WebAPI app with the Steeltoe Initializr
2. Name the project "PlaceholderExample"
3. Add the "Placeholder" dependency
4. Click Generate Project to download a zip containing the new project
5. Extract the zipped project and open in your IDE of choice (we use Visual Studio)

Run the application

• .NET cli
• Visual Studio

dotnet run <PATH_TO>\PlaceholderExample.csproj

Navigate to the endpoint (you may need to change the port number) http://localhost:5000/api/values

Once the app loads in the browser you will see the three values output.

["<PATH_ENV_VAR>","NotFound","Information"]