placeholder.md

uid	title	tags	_disableFooter	_hideTocVersionToggle
guides/application-configuration/placeholder	Placeholder Provider		true	true

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

dotnet run <PATH_TO>\PlaceholderExample.csproj

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

Visual Studio

1. Choose the top Debug menu, then choose Start Debugging (F5). This should bring up a browser with the app running.
2. Navigate to the endpoint (you may need to change the port number) http://localhost:8080/api/values

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

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