How to get current app relative url for login redirect in ASP.NET Core

Question

I'm trying to implement simple logic so that whatever page a user is on in a site is where the user will get redirected back to after login. To do that it seems I need an easy way to get the relative url of the current request.

I tried using the full url with a link like this in my _LoginPartial.cshtml:

<a asp-controller="Login" asp-action="Index" asp-route-returnUrl="@Context.Request.GetEncodedUrl()">Log in</a>

but that results in an error:

A URL with an absolute path is considered local if it does not have a host/authority part. URLs using virtual paths ('~/') are also local.

Seems like there should be a simple built in method for getting the current relative url. Am I missing something or do I need to implement my own extension method for this? I'm using RC1

Answer 1

There is an extension method for that: Request.GetDisplayUrl(); that returns https://localhost/MyController/MyAction?Param1=blah.

Or the encoded version Request.GetEncodedUrl()

To any of them you must add: using Microsoft.AspNetCore.Http.Extensions;

Answer 2

Do you mean Context.Request.Path?

I quickly made a sample project with a HomeController, an Index.cshtml and a Second.cshtml. The Second.cshtml looks like:

@addTagHelper "*, Microsoft.AspNet.Mvc.TagHelpers"
<h1>@ViewBag.Title</h1>
<a asp-controller="Home" asp-action="Index" asp-route-returnUrl="@Context.Request.Path">Log in</a>

And the anchor tag renders to the browser as (tested with Chrome dev tools):

<a href="/?returnUrl=%2FHome%2FSecond">Log in</a>

You have Request.Query and/or Request.QueryString to concatenate the full URL.

You could make an extension method on the HttpRequest class to for instance return the Path and the QueryString together if you wish.