.NET Core console application, how to configure appSettings per environment?

Question

I have a .NET Core 1.0.0 console application and two environments. I need to be able to use appSettings.dev.json and appSettings.test.json based on

Answer 1

If like me, you're simply trying to have a different configuration file for Release and Development mode, just add a appsettings.Development.json file with CopyToOutputDirectory setting set to true in the file's property window.

Now, to access the file depending on the build configuration, you can use the #if DEBUG preprocessor directive.

Here's an example :

static void Main(string[] args)
{

#if DEBUG
    var builder = new ConfigurationBuilder()
            .AddJsonFile($"appsettings.Development.json", true, true);
#else
    var builder = new ConfigurationBuilder()
            .AddJsonFile($"appsettings.json", true, true);
#endif

    var configuration = builder.Build();

    // ... use configuration
}