Setting HostingEnvironment.EnvironmentName to Development in Rider

Question

My code:

    public static async Task Main(string[] args)
    {
        var host = new HostBuilder()
            .ConfigureAppConfiguration(
                (hostContext, configApp) =>
                {
                    configApp.SetBasePath(Directory.GetCurrentDirectory());
                    configApp.AddJsonFile("appsettings.json");
                    configApp.AddJsonFile(
                        $"appsettings.{hostContext.HostingEnvironment.EnvironmentName}.json",
                        optional: true);
                })
            .Build();

        await host.RunAsync();
    }

In runtime I see that the value of HostingEnvironment.EnvironmentName is Production.

I tried to set the following environment variable in running configuration, but it didn't change the runtime: ASPNETCORE_ENVIRONMENT=Development.

Where can I configure it?

Answer 1

Adding the following solved the issue, I figured it after debugging with decompiled .NET source. It doesn't seem documented anywhere, or I'm missing something.

    public static async Task Main(string[] args)
    {
        var host = new HostBuilder()
            .ConfigureHostConfiguration(configHost => configHost.AddEnvironmentVariables())
            .ConfigureAppConfiguration(
                (hostContext, configApp) =>
                {
                    configApp.SetBasePath(Directory.GetCurrentDirectory());
                    configApp.AddJsonFile("appsettings.json");
                    configApp.AddJsonFile(
                        $"appsettings.{hostContext.HostingEnvironment.EnvironmentName}.json",
                        optional: true);
                })
            .Build();

        await host.RunAsync();
    }

The added line is ConfigureHostConfiguration call.