带有 Blazor 的 ASP.NET Core 3.1 MVC - 缺少程序集

Question

I'm trying to follow this tutorial about using Blazor in my existing apps with Visual Studio 2019 v16.4.3 (non-preview). I first created a new Core 3.1 MVC Web App to test it out, before implementing it to my other apps. But at the part where I need to write the <component> tag helper in the Index.cshtml , I keep getting this:

The type or namespace name 'HelloWorld' could not be found (are you missing a using directive or an assembly reference?)    

Here is my Index.cshtml :

@page
@model IndexModel
@{
    ViewBag.Title = "Home Page";
}

<script src="~/_framework/blazor.server.js"></script>
<component type="typeof(HelloWorld)" render-mode="ServerPrerendered" />

and here is my HelloWorld.razor :

@page "/Hello"

<h3>HelloWorld</h3>

@code {
}

I placed the HelloWorld.razor in a Pages folder at the root of my solution. Also, if needed, here are the Startup.cs methods that were changed:

public void ConfigureServices(IServiceCollection services)
{
    services.AddControllersWithViews();
    services.AddRazorPages();
    services.AddServerSideBlazor();
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    ...

    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllerRoute(
            name: "default",
            pattern: "{controller=Home}/{action=Index}/{id?}");

        endpoints.MapRazorPages();
        endpoints.MapBlazorHub();
    });
}

What am I missing? Thanks!

Answer 1

Apparently, the tutorial I linked in the original post is missing something. Instead of:

typeof(HelloWorld)

it should be something like this:

typeof(<namespace name>.<the folder the .razor file is in>.<the .razor file name>)

so in my case, it should look like this:

typeof(TestMVCBlazor.Pages.HelloWorld)