How can I use T4MVC with the external login confirmation form in the default MVC5 project?

Question

In the default ASP.NET MVC 5 web project, the "Login" view ("Login.cshtml") has a BeginForm call like this:

@using (Html.BeginForm("Login", "Account", new { ReturnUrl = ViewBag.ReturnUrl }, FormMethod.Post, new { @class = "form-horizontal", role = "form" }))

I'm trying to convert all my ActionLink, BeginForm (etc.) calls to use T4MVC, and so I changed it to:

@using (Html.BeginForm(MVC.Account.Login().AddRouteValue("ReturnUrl", (string)ViewBag.ReturnUrl), FormMethod.Post, new { @class = "form-horizontal", role = "form" }))

...which worked fine.

However, there's another form in "ExternalLoginConfirmation.cshtml", which starts like this:

@using (Html.BeginForm("ExternalLoginConfirmation", "Account", new { ReturnUrl = ViewBag.ReturnUrl }, FormMethod.Post, new { @class = "form-horizontal", role = "form" }))

I tried to use the same approach:

@using (Html.BeginForm(MVC.Account.ExternalLoginConfirmation().AddRouteValue(...)

...but the object returned by MVC.Account.ExternalLoginConfirmation has no AddRouteValue method.

I think this is because ExternalLoginConfirmation is an async action method that actually returns a Task<T> rather than just a T.

Is there any way I can get this to work with T4MVC, or do I simply need to leave this one alone? (I know I can just replace the magic strings using MVC.Account.ActionNames.ExternalLoginConfirmation and MVC.Account.Name), but it would be nice to be able to use the helper.

Answer 1

This is covered in this thread. Basically, try:

MVC.Account.ExternalLoginConfirmation().Result.AddRouteValue(...)