How to switch configuration while debugging .Net core 2.x app?

Question

Have been looking for the right way to add configurations to my dot net core 2.0 web API.

Until now what I have done is:

Added appsetteings.Development.json, appsetteings.Production.json

In program.cs:

public static IWebHost BuildWebHost(string[] args)
{
    return WebHost.CreateDefaultBuilder(args)
        .UseStartup<Startup>()
        .ConfigureAppConfiguration((hostContext, config) =>
        {
            var env = hostContext.HostingEnvironment;
            config.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true);
        })
        .Build();
}

In startup.cs

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc();
    services.Configure<dynamic>(Configuration);
}

The issue is whenever I debug my code it always takes settings from appsettings.Development.json.

I also found that the hostContext.HostingEnvironment.EnvironmentName always comes as development regardless of which environment I pick to debug in.

I suggest you edit your title (make it a How To question) before this question is closed as off topic. Questions asking us to recommend or find a book, tool, software library, tutorial or other off-site resource are off-topic for Stack Overflow as they tend to attract opinionated answers and spam. Instead, describe the problem and what has been done so far to solve it. We can add reference links to answers, but you shouldn't request them. — NightOwl888
– NightOwl888, Commented Mar 21, 2018 at 7:12

Simply Ged · Accepted Answer · 2018-03-21 08:46:37Z

2

There is a setting with the project properties that is causing the Development environment setting to be used during debug.

Open Project properties Navigate to the Debug page In the Environment Variables section you will see:

ASPNETCORE_ENVIRONMENT | Development

If you remove this flag and debug you app it should be running without the Development settings.

The official documentation can be found here

edited Mar 21, 2018 at 8:46

answered Mar 21, 2018 at 8:37

Simply Ged

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2 Comments

Ankit Kumar Ojha Over a year ago

Thanks a lot, that was very helpful.

Toolkit Over a year ago

What if it's a Console app?

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