How to call UseWebRoot in ASP.NET Core 3.0

Question

In ASP.NET Core 2.2, I could set UseWebRoot() like:

public static void Main(string[] args)
{
   CreateWebHostBuilder(args)
     .UseUrls("http://*:5000")
     .UseWebRoot(@".\WebSite\wwwroot\")
     .Build()
     .Run();
}

But I do not know how I should do it today because there is no such method anymore.

Answer 1

ASP.NET Core 3.0 projects use the Generic Host, by default. In the project templates, it's configured like this:

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webHostBuilder =>
        {
            webHostBuilder.UseStartup<Startup>();
        });

In the example above, webHostBuilder is an implementation of IWebHostBuilder, which still contains the UseWebRoot extension method. That means you can call it as you did for 2.2, but it's just moved to inside the delegate passed in to ConfigureWebHostDefaults shown above. Here's the complete example:

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webHostBuilder =>
        {
            webHostBuilder.UseStartup<Startup>();
            webHostBuilder.UseWebRoot(@".\WebSite\wwwroot\");
        });