asp.net MVC3 razor: display actionlink based on user role

Question

I'm new to MVC. I want to be able to hide some actionlinks for some users. Say I have a "create" actionlink which I only want administrators to see and click. I want to use some sort of "loggedintemplate" available in asp.net, but it doesn't seem to work in razor.

I could use some sort of code block with an if statement checking the current user and her role, however that may not be best practice?

my index.cshtml..

// want some adminauth attribute here... @Html.ActionLink("Create New", "Create")

my controller..

// GET: /Speaker/Create [Authorize(Roles = "Administrators")] public ActionResult Create() { return View(); }

Elan Hasson · Accepted Answer · 2011-09-11 09:08:41Z

137

I have in the past created a helper function to only return output when a criteria is met like this:

public static MvcHtmlString If(this MvcHtmlString value, bool evaluation) { return evaluation ? value : MvcHtmlString.Empty; }

so you can use this:

@Html.ActionLink("Create New", "Create").If(User.IsInRole("Administrators"))

This way it is legible and short

edited Sep 11, 2011 at 9:08

Elan Hasson

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answered Aug 8, 2011 at 12:14

Richard

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3 Comments

Elan Hasson Over a year ago

I've switched the String.Empty conversion to MvcHtmlString to use MvcHtmlString.Empty instead.

NoWar Over a year ago

@Neel Create the folder Helpers and add static helper class and put there this code. And later in cshtml at the top put @using Helpers.YourClass

Neel Over a year ago

ohh it was almost 3 years ago and now I don't even remember where i was using this @Dimi :P but anyways thanks :)

Matthieu · Accepted Answer · 2011-08-08 12:43:22Z

42

If you want a code block, that would do in the view :

@if (Roles.IsUserInRole("Administrators")) { <li>@Html.ActionLink("Create New", "Create")</li> }

answered Aug 8, 2011 at 12:43

Matthieu

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2 Comments

Kristofer Hoch Over a year ago

Matthieu, I would have normally taken that approach as well. Check out Richard's response.

Matthieu Over a year ago

@Kristofer : In some cases you may want to have a block structure to avoid having html hanging around for example.

Elan Hasson · Accepted Answer · 2011-09-11 02:02:31Z

I've modified Richard's code to provide an optional MvcHtmlString parameter to return if the evaluation is false.

public static MvcHtmlString If(this MvcHtmlString value, bool evaluation, MvcHtmlString falseValue = default(MvcHtmlString)) { return evaluation ? value : falseValue; }

Sudarshan_SMD · Accepted Answer · 2016-02-04 19:51:04Z

If you haven't enabled roleManager and you still want to check User's role, you can do it like this:

 @if (@User.IsInRole("administrator")) { @Html.ActionLink("Create New Version", "Create") }

What we are doing it here is, we are just accessing user's properties. This can useful if you are managing roles yourself.

Olek · Accepted Answer · 2011-08-26 19:47:06Z

The solution suggested by Richard is really beautiful, though as Matthieu noted someone might need extra html code to be rendered (or not rendered) as well. Thus Matthieu's solution seems to be more widely applicable, I would just centralize the logic regarding which users are considered admins in extension method.

Extension method:

public static bool IsAdmin(this WebViewPage page) { return page.User.IsInRole(@"Domain\ProjectAdmins"); }

Usage:

@if (this.IsAdmin()) { <p> @Html.ActionLink("Create New Version", "Create") </p> }

Paolo The Caveman Russo · Accepted Answer · 2016-03-16 13:45:54Z

You can add a function to App_Code/ViewFunctions.cshtml (create if missing)

@using System.Web.Mvc; @functions{ public static object ConditionalActionLink(object actionLink, ICollection<string> arrAuthUsers) { bool objIsVisible = arrAuthUsers .Select(s => User.IsInRole(s)) .Where(s => s.Equals(true)) .Any(); return (objIsVisible) ? actionLink : MvcHtmlString.Empty; }

To use that function just add following code to the view.

@ViewFunctions.ConditionalActionLink( @Html.ActionLink("TextToDisplay", "SomeAction", new { Area = "SomeArea", Controller = "SomeController" }), new string[] { "administrator","jDoe", "someOtherUser" })

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