I'm getting errors when trying to add Razor to an ASP.NET Core MVC project

Question

Early this month I started a new ASP.NET Core application, which I'm writing in .NET 8. I used this because I've got to use Windows Authentication. However, I also want to learn Blazor, so I added that to the project.

Now I'm gettings errors in the RouteView.razor file and the Routes.razor file. Here's the RouteView.razor file:

<RouteView RouteData="routeData" DefaultLayout="typeof(MainLayout)" />

The errors it is raising are:

• RZ9985 Multiple components use the tag 'RouteView' (two of this error)
• CS1061 'RouteView' does not contain a definition for 'RouteData' and no accessible extension method 'RouteData' accepting a first argument of type 'RouteView' could be found
• CS0103 The name 'routeData' does not exist in the current context (two of this error)
• CS1061 'RouteView' does not contain a definition for 'DefaultLayout' and no accessible extension method 'DefaultLayout' accepting a first argument of type 'RouteView' could be found
• CS0246 The type or namespace name 'MainLayout' could not be found (two of this error)

And here's what's in the Routes.razor file:

<Router AppAssembly="typeof(Program).Assembly">
    <Found Context="routeData">
        <RouteView RouteData="routeData" />
        <FocusOnNavigate RouteData="routeData" Selector="h1" />
    </Found>
</Router>

And the error its raising is:- RZ9985 Multiple components use the tag 'RouteView'

I'm not sure why it is raising these errors. I am still too new to Blazor. Is it because I created the ASP.NET Core project first, then added Blazor?

Answer 1

no. its your blazer code. normally, the App.Razor references the Routes.Razor, and Routes references the layout. also check your _imports.razor.

I'd create a new blazor app from the template, and compare to your project. (also try deleting obj & bin folders, then rebuild).

note: windows authentication is implemented by IIS, and the user handle is passed to asp.net. the default builder normally included this support.