Blazor server-side, .NET Core 3.1.x
Look over the examples on authorization, I am trying to get a solution for a custom authorization filter/attribute. I simply need to check the user identity during Authorization.

<https://learn.microsoft.com/en-us/aspnet/core/security/blazor/?view=aspnetcore-3.1>

At the top of a Blazor page, after @page 

```
@attribute [MyAuthFilter]

```

The filter. OnAuthorization never gets hit however. 

```
public class MyAuthFilter: AuthorizeAttribute,IAuthorizationFilter
{
    public void OnAuthorization(AuthorizationFilterContext context)
    {
        var httpContext = context.HttpContext;

        // get user name
        string userName = httpContext.User.Identity.Name;

        // todo - call method to check user access
        // check against list to see if access permitted
        //context.Result = new UnauthorizedResult();

    }
}

```