Any way to use Authorization Policies in a view in .NET Core 1.0 MVC?

Question

I know in controllers, you can write [Authorize("policyName")] without an issue, but is there any way to use a policy in a view? I'd rather not use User.IsInRole(...) every single time I want to authorize some HTML.

Edit:

Here's some code

Startup.cs -- Policy Declaration

    services.AddAuthorization(options =>     {         options.AddPolicy("testPolicy", policy =>         {             policy.RequireAuthenticatedUser()                   .RequireRole("RoleOne", "RoleTwo", "RoleThree")                   .RequireClaim(ClaimTypes.Email);         });     }); 

Admin Controller

[Authorize("testPolicy")] public class AdminController : Controller {     public IActionResult Index()     {         return View();     } } 

Navbar HTML

<div class="navbar navbar-inverse navbar-fixed-top">             <div class="container">                 <div class="navbar-collapse collapse">                     <ul class="nav navbar-nav">                         <li><a asp-controller="Home" asp-action="Index">Home</a></li>                           <!-- I want to implement my policy here. -->                         @if (User.IsInRole("..."))                         {                             <li><a asp-controller="Admin" asp-action="Index">Admin</a></li>                         }                     </ul>                     @await Html.PartialAsync("_LoginPartial")                 </div>             </div> 

Answer 1

I ended up creating a tag helper to conditionally hide the element it's associated with.

[HtmlTargetElement(Attributes = "policy")] public class PolicyTagHelper : TagHelper {     private readonly IAuthorizationService _authService;     private readonly ClaimsPrincipal _principal;      public PolicyTagHelper(IAuthorizationService authService, IHttpContextAccessor httpContextAccessor)     {         _authService = authService;         _principal = httpContextAccessor.HttpContext.User;     }      public string Policy { get; set; }      public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)     {         // if (!await _authService.AuthorizeAsync(_principal, Policy)) ASP.NET Core 1.x         if (!(await _authService.AuthorizeAsync(_principal, Policy)).Succeeded)             output.SuppressOutput();     } } 

Usage

<li policy="testPolicy"><a asp-controller="Admin" asp-action="Index">Admin</a></li>