Hi All

How could I implement FormsAuthentication.RedirectFromLoginPage  under MVC Preview 3 since every function needs to return the Actionresult.

Regards

Alex

this is some helpfull links on how to use formsauthentication with MVC :

http://weblogs.asp.net/fredriknormen/archive/2008/02/07/asp-net-mvc-framework-using-forms-authentication.aspx

http://mikehadlow.blogspot.com/2008/03/forms-authentication-with-mvc-framework.html

try to search the web ...

But under MVC Preview 3, it has ActionResult return type under the controller, how could I handle for FormsAuthentication.RedirectFromLoginPage. Could I make the FormsAuthentication.RedirectFromLoginPage as the ActionResult?

There isn't any special type of ActionResult for forms authentication. Your simplest solution is either to have a "void" action method, or just to call RedirectFromLoginPage, then return null, ie.

public ActionResult MyActionMethod() 
{
	if(loginIsValid)
	{
		FormsAuthentication.RedirectFromLoginPage(... etc ...);
		return null;
	}
	else
	{
		// Do whatever else
		return RedirectToAction("Login");
	}
}

If  you're bothered about testability, you can create your own special ActionResult (FormsAuthenticationActionResult?) whose Execute method calls FormsAuthentication.RedirectFromLoginPage.

You can avoid using FormsAuthentication.RedirectFromloginPage ,

Instead , use FormsAuthentication.SetAuthCookie(UserName,IsPersisted) ,which just set the authentication cookie without redirection ,

 then redirect to the action that you want

public ActionResult MyActionMethod() 
{
	if(loginIsValid)
	{
		FormsAuthentication.SetAuthCookie(username....
		return RedirectToAction("ActionName");
	}
	else
	{
		// Do whatever else
		return RedirectToAction("Login");
	}
}

Right ?

But if the user doesn't login through the main page and he needs to return to his previous page, is it possible to handle it?

There are a few pieces to the puzzle.  When your LogOn action is called the first time the Forms Authentication mechanism will have added a query string parameter called returnUrl.  You need to capture this.  Something like

public ActionResult LogOn(string returnUrl)
{
   ViewData["ReturnUrl"] = returnUrl;
   return View();
}

 Your view needs to have a hidden field so that the returnUrl can be passed back to the authentication action.  Somewhere inside the form which collects username and password (in the case above it would be called LogOn.aspx) you will want

<%= Html.Hidden("returnUrl", ViewData["ReturnUrl"]) %>

Assuming the the LogOn form submits to an action called Authenticate your code will be

public ActionResult Authenticate(string username, string password,
                                 string retuUrl)
{
   if (ValidLogin(username, password) {
      FormsAuthentication.SetAuthCookie(username, false);
      if (returnUrl == null)
         return RedirectToAction("someAction", "someController");
      else
         return Redirect(returnUrl);
   }
   else
   {
      return RedirectToAction("LogOn", new {returnUrl = returnUrl});
   }
}