如何设置 appsettings.json 自动部署到 ASP.NET 核心？

Question

I look at several topics eg Automatically set appsettings.json for dev and release environments in asp.net core? and see that I can create appsettings.{Environment}.json in .NET Core apps and set the environment in launchSettings.json .

However, I am wondering what should I do to set this environment properly while publishing my app to IIS or Docker container. Before each publishing, should I change the environmentVariables parameter to Prod and then update it to Development after publish? I do not think so, but I could not find a suitable page explaining this. Could you please clarify me about this issue?

Answer 1

First of all as docs state: launchSettings.json is only used on the local development machine.

As for using configuration file - by default next files are used:

• appsettings.json using the JSON configuration provider.
• appsettings.Environment.json using the JSON configuration provider. For example, appsettings.Production.json and appsettings.Development.json .

The environment for ASP.NET Core app determined next way:

To determine the runtime environment, ASP.NET Core reads from the following environment variables:

• DOTNET_ENVIRONMENT
• ASPNETCORE_ENVIRONMENT when ConfigureWebHostDefaults is called. The default ASP.NET Core web app templates call ConfigureWebHostDefaults . The ASPNETCORE_ENVIRONMENT value overrides DOTNET_ENVIRONMENT .

So the usual approach is to set ASPNETCORE_ENVIRONMENT environment variable to needed value on target host (machine, docker container, etc...)