如何控制appsettings.json部署基于.Net Core环境

Question

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

• appSettings.UAT.json
• appSettings.Dev.json
• appSettings.Prod.json

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

• appSettings.json
• appSettings.UAT.json

& if the env is Prod then

• appSettings.json
• appSettings.Prod.json

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!

Answer 1

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.

You can find more information from the MS Docs https://docs.microsoft.com/en-us/aspnet/core/fundamentals/environments?view=aspnetcore-3.1#set-the-environment

Answer 2

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.