Wsrtjtyk

I'm using Azure DevOps for building and releasing a .NET Core MVC web application to a Windows Server 2016 EC2 instance in AWS.

I have different environments, so I've created the following appsettings.json files:

• appsettings.DEV.json


• appsettings.STG.json


• appsettings.PRD.json

After some research, I see that we can set the ASPNETCORE_ENVIRONMENT variable in the web.config file:

<?xml version="1.0" encoding="utf-8"?>

<configuration>

    <location path="." inheritInChildApplications="false">

    <system.webServer>

      <handlers>

        <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModule" resourceType="Unspecified" />

      </handlers>

      <aspNetCore processPath="dotnet" arguments=".www.MyApp.dll" stdoutLogEnabled="false" stdoutLogFile=".logsstdout">

      <environmentVariables>

        <environmentVariable name="ASPNETCORE_ENVIRONMENT" value="[ENV]" />

      </environmentVariables>

      </aspNetCore>

    </system.webServer>

  </location>

</configuration>

I can then load the respective environment appsetting.json file using the following code in Program.cs:

public class Program

    {

        public static void Main(string args)

        {

            CreateWebHostBuilder(args).Build().Run();

        }



        public static IWebHostBuilder CreateWebHostBuilder(string args) =>

            WebHost.CreateDefaultBuilder(args)

                .ConfigureAppConfiguration(ConfigConfiguration)

                .UseStartup<Startup>();



        static void ConfigConfiguration(WebHostBuilderContext ctx, IConfigurationBuilder config)

        {

            config.SetBasePath(Directory.GetCurrentDirectory())

                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)

                .AddJsonFile($"appsettings.{ctx.HostingEnvironment.EnvironmentName}.json", optional: true, reloadOnChange: true);



        }

    }

For each deployment, I would like to control the web.config that gets deployed so that I can control the value of ASPNETCORE_ENVIRONMENT. Similar to web.config transform in a traditional ASP.NET environment.

Is there a way to do this in Azure DevOps, or via a setting in Visual Studio? I've read that .NET Core 2.2 will offer a solution for this, but what can be done in the meantime?

I'm using standard web.config transformations (deploy to IIS)

Transformation web.staging.config:

<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">

  <location>

    <system.webServer>

      <aspNetCore>

        <environmentVariables>

          <environmentVariable xdt:Transform="Replace" xdt:Locator="Match(name)" name="ASPNETCORE_ENVIRONMENT" value="Staging" />

        </environmentVariables>

      </aspNetCore>

    </system.webServer>

  </location>

</configuration>