how to control the appsettings.json deployment based on environment in .Net Core

Question

I have ASP.Net Core 3.1 application & it has environment based appsettings.json as

When the app is published/deployed to any env say UAT, all the appsettings.json gets deployed to the UAT machine.

The requirement is that if the machine/env is UAT, then only below appSettings should be deployed

& if the env is Prod then

I know the other way is to store/fetch configuration from Environment variables rather appSettings.json but for now that has extra cost for me.

Thanks!

user_4925321 · Answer

This can be controlled by setting the ASPNETCORE_ENVIRONMENT variable on the UAT machine to UAT.

The defaults that .net core ships with is Development, Staging and Production.

user_5362884 · Answer

You can set up the "ASPNETCORE_ENVIRONMENT" variable against your website in IIS.

Open the "Internet Information Services (IIS) Manager.

Go to the Website where you want to set the environment variable. Find the "Configuration Editor".
In the "Section" part of Configuration Editor, select system.webServer/aspNetCore in the left dropdown select ApplicationHost.config.
Click on environmentVariables then you will get the Current env variable. Add a new env variable.
name will be ASPNETCORE_ENVIRONMENT and value will be Development[staging/Prod]. In your case it will be UAT or DEV or Prod
Close the window and restart the website.

Give a try with the above.