ASP.Net MVC: regarding RedirectToAction function

9y22.4k.NET

suppose i have two action in controller called login

public ActionResult Login()
{
return View();
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Login(UserProfile objUser)
{
if (ModelState.IsValid)
{
using(DB_Entities db = new DB_Entities())
{
var obj = db.UserProfiles.Where(a => a.UserName.Equals(objUser.UserName) && a.Password.Equals(objUser.Password)).FirstOrDefault();
if (obj != null)
{
Session["UserID"] = obj.UserId.ToString();
Session["UserName"] = obj.UserName.ToString();
return RedirectToAction("UserDashBoard");
}
}
}
return View(objUser);
}

when we write return RedirectToAction("Login"); then how asp.net mvc understand that we are thinking about login function which uisng get http verb login not post http verb login ?

anyone can explian it ?

how we can redirect to action which is based on post http verb ?

what will be the syntax if we need to redirect to action with http verb if we use RedirectToAction function ?

thanks

2 Replies

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Manas Mohapatra9y ago
Accepted answer
When RedirectToAction() fires, browser receives the redirect notification and make a new request for the specified action.

It acts like as Response.Redirect() in Asp.Net WebForm. Moreover, RedirectToAction construct a redirect url to a specific action/controller in your application and use the route table to generate the correct URL. RedirectToAction cause the browser to receive a 302 redirect within your application and gives you an easier way to work with your route table.

HTTP POST doesn't support redirection to a page. We need to handle it manually, follow below code-snippet:
public ActionResult Login(){
    return View();
}

[HttpPost]
public ActionResult Login(LoginModel model)
{
    if (true)
    {
        return RedirectToAction("Index");
    }

    return View(model);
}

[HttpPost]
public ActionResult SignIn(UserModel model)
{
    //Register new User
    //...
    if (allOk)
    {
        return RedirectToAction("Login");
    }
    else
    {
        return RedirectToAction("Login"), new LoginModel() { id = 0;});
    }

    return View(model);
}
Saravanan V9y ago
As per Microsoft, RedirectToAction Method returns an HTTP 302 response to the browser, which causes the browser to make a GET request to the specified action.
The HttpPostAttribute ( [HttpPost] ) is an implementation of IActionConstraint that will only allow the action to be selected when the HTTP verb is POST.
I hope you can't redirect to a Post action method in MVC.

Hope this answer helps you.