servicestack with asp.net core read web.config

Question

How to read appsettings.json or web.config with ServiceStack ASP.Net Core?

IAppSettings appSettings = new AppSettings();
appSettings.Get<string>("Hello");

does not find anything.

Answer 1

ServiceStack's default AppSettings for .NET Core can read <appSettings/> , SimpleAuth.Mvc web.config is an example project that uses this.

Using .NET Core's IConfiguration config model

With the new ServiceStack v5 that's now available on MyGet you can choose to instead use .NET Core's IConfiguration model with the new NetCoreAppSettings IAppSettings adapter.

.NET Core's IConfiguration class is automatically pre-configured when running your .NET Core app using the recommended .NET Core 2.0 Startup config, ie:

public class Program
{
    public static void Main(string[] args)
    {
        BuildWebHost(args).Run();
    }

    public static IWebHost BuildWebHost(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>()
            .Build();
}

Where you can request to get it injected into the Startup constructor and assign it to a property with:

public class Startup
{
    public IConfiguration Configuration { get; }
    public Startup(IConfiguration configuration) => Configuration = configuration;

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseServiceStack(new AppHost
        {
            AppSettings = new NetCoreAppSettings(Configuration)
        });
    }
}

Then you can get ServiceStack to use it with the NetCoreAppSettings adapter as seen above.

This works as a normal IAppSettings which you can use to read individual config values, eg:

public class AppHost : AppHostBase
{
    public override void Configure(Container container)
    {
        SetConfig(new HostConfig
        {
            DebugMode = AppSettings.Get(nameof(HostConfig.DebugMode), false)
        });
    }
}

Or bind to complex Types using the IAppSettings.Get<T>() APIs.

An example .NET Core 2.0 ServiceStack v5 project that uses it is NetCoreTemplates/react-spa .