Checking login user AuthorizePolicy in Razor page on Asp.Net Core

With Dot net core 2.0 AuthorizationService.AuthorizeAsync no longer returns a boolean, it returns a AuthorizationResult. A working version for dot net core 2.0 will be something like this:

@using Microsoft.AspNetCore.Authorization
@inject IAuthorizationService AuthorizationService

@if ((await AuthorizationService.AuthorizeAsync(User, "RequireAuthenticatedUser")).Succeeded)
{
     <li><a asp-area="" asp-controller="Roles" asp-action="Index">Roles</a></li>
}

This seems similar to question asked here

I found this link which may be helpful: https://docs.asp.net/en/latest/security/authorization/views.html

Examples from that page:

@if (await AuthorizationService.AuthorizeAsync(User, "PolicyName"))
{
    <p>This paragraph is displayed because you fulfilled PolicyName.</p>
}

In some cases the resource will be your view model, and you can call AuthorizeAsync in exactly the same way as you would check during resource based authorization;

@if (await AuthorizationService.AuthorizeAsync(User, Model, Operations.Edit))
{
    <p><a class="btn btn-default" role="button"
    href="@Url.Action("Edit", "Document", new {id= Model.Id})">Edit</a></p>
}