How to set aspnetcore_environment in publish file?

Question

I have ASP.NET Core application (Web Api). The documentation has explained working with multiple environments, however it failed to explain how to set aspnetcore_envir

Answer 1

To setup two or more profiles, you need to create additional profile, as mentioned in a linked article, and your launchSettings.json will contain an array:

"profiles": {
  "IIS Express": {
    "commandName": "IISExpress",
    "launchBrowser": true,
    "environmentVariables": {
      "ASPNETCORE_ENVIRONMENT": "Development"
    }
  },
  "IIS Express (Staging)": {
    "commandName": "IISExpress",
    "launchBrowser": true,
    "environmentVariables": {
      "ASPNETCORE_ENVIRONMENT": "Staging"
    }
  }
}

To be able to read the environment variable, you need to specify it during startup and call additional method AddEnvironmentVariables to variables take action:

public class Startup
{
    public Startup(IHostingEnvironment env)
    {
        var builder = new ConfigurationBuilder()
            .SetBasePath(env.ContentRootPath)
            // general properties
            .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
            // specify the environment-based properties
            .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
            // do not forget to add environment variables to your config!
            .AddEnvironmentVariables();
        Configuration = builder.Build();
    }
}