Sending temporary information between classes with C# 4.0 MVC 4

Question

Working with a Solution VS 2015 that has 2 sites, "projectA.site.com.br" and "projectB.site.com.br", their views and controllers are in the same project, named as "WEB", developed in C# . NET 4 with MVC 4, but in two folders, "Project A" and "Project B", that is, everything is organized.

The situation is as follows, when the user access the site "projectA.site.com.br" and click on a certain option, I will direct it to the registration site, which is in Project B, but a dropdown will be filled with certain values, and if the user reloads the page, this dropdown must be filled with other different values.

Technically, when the user clicks on a certain option, mentioned above, a method will be triggered in my Project A controller, which in MVC Tempdata I enter the value 1, then call the Index() method of the Project B controller

PROJECT A

VIEW

<li>
          <a href="@Url.Action(MVC.ProjetoA.Home.AbrirCadastro())"><i class="fa fa-file-text-o"></i> Cadastro </a>
</li>

CONTROLLER

    [RequiresAuthorization]
    public virtual ActionResult AbrirCadastro()
    {
        Client dadosUsuario = ViewBag.User;
        TempData["Teste"] = 1;
        return Redirect(Url.SubdomainUrl(SubdomainConstants.Register, MVC.ProjetoB.Home.Index()));
    }

In the Index() method of the Project B controller I will have a validation to customize the values to be filled in the dropdown.

PROJECT B

CONTROLLER

    [HttpGet]
    public virtual ActionResult Index()
    {
        if (TempData["Teste"] != null)
        {
            //Preencho dropdown de uma maneira
        }
        else
        {
            //Preencho dropdown de outra maneira
        }
        return View();
    }

But in my Index() method Tempdata is null. How do I send information from the Open Register() method, in the Project A controller, to the Index() method, in the Project B controller?

I need it to be something temporary, that only the Open Registration() method send, and that is not displayed in the URL, so that it is not traceable. I thought about working with Session (that’s why Tempdata) or with parameters in methods, but I don’t know how to hide the parameter in the URL.

Answer 1

Assuming you have access to both systems, you could perform a POST from Projectoa to the Projectob passing a value. And, in the projectB you check if this value exists and fill your TempData. An example would be more or less that:

Project B

Create a POST Action to receive data from another application. If you have value, you redirect with the TempData. It would be something like this:

   // GET: ProjetoB
    public ActionResult Index()
    {
        string valor = "";
        if (TempData["Teste"] != null)
        {
            valor = "sim";
        }
        else
        {
            valor = "não";
        }

        ViewBag.Valor = valor;
        return View();
    }

    [AllowAnonymous]
    [HttpPost]
    public ActionResult Index(string valor)
    {
        //Caso tenha valor, você preenche o TempData
        if(!string.IsNullOrEmpty(valor))
            TempData["Teste"] = 1;

        return RedirectToAction("Index");
    }

I am passing the value in case you want to use it in any query. But, for your Model this would be irrelevant.

This way, when updating the page the TempData will be null, and this way you don’t fill the DropDown.

Project A

In his Projectoa just perform the POST to the correct page of Projectob, in this way:

<li>
    @*Na Action você deve passar o valor completo do Action POST do ProjetoB*@
    <form action="/ProjetoB/Index" method="post" id="link-cadastro">
        <input type="hidden" value="true" name="valor" />
        <a href="javascript:void(0);" onclick="$('#link-cadastro').submit()"><i class="fa fa-file-text-o"></i> Cadastro </a>
    </form>
</li>

Change the action="/ProjetoB/Index" to the way of POST of Projectob.

Note that I am only using HTML for a better understanding. However, you can use HtmlHelpers normally.

Answer 2

One option would be to work with cookies.

To be exact, with domain cookies.

According to the your comment, both systems are subdomains of the same domain, that is, they all end with .site.com.br. Therefore, you can set a cookie by clicking on the Projectoa and delete from the Action Index Projectob.

It would be something like this:

Projectoa

In the Projectoa you would create an Action just to create the cookie and redirect to the Projectob (can do via JS too, is at your discretion), in this way:

public ActionResult LinkFake()
{
    HttpCookie cookie = new HttpCookie("MeuCookie");
    //Define o valor do cookie
    cookie.Value = "valorQualquer";
    //Define o Dominio do cookie
    cookie.Domain = "seudominio.com";
    //Adiciona o cookie
    Response.Cookies.Add(cookie);

    //Redireciona para o ProjetoB
    return RedirectToAction("URL PROJETO B");
}

And in your View, you’d call Action LinkFake(), in this way:

<li>
    <a href="@Url.Action(LINK DA ACTIONFAKE AQUI)"><i class="fa fa-file-text-o"></i> Cadastro </a>
</li>

And in His Projectob you just check if there’s that cookie or not, in this way:

public ActionResult Index()
{
    HttpCookie cookie = Request.Cookies["MeuCookie"];

    if(cookie != null)
    {
        cookie.Expires = DateTime.Now.AddDays(-1d);
        Response.Cookies.Add(cookie);

        //Preencho dropdown de uma maneira
    }
    else
    {
        //Preencho dropdown de outra maneira
    }

    return View();
}

Study links:

• How to browser cookie Domains work?
• Share cookie between subdomain and Domain
• Cross-Domain Cookies

Answer 3

With the help of @Randrade suggestions, I was able to reach the final result as below:

PROJECT A

The view remains the same as the question.

VIEW

<li>
      <a href="@Url.Action(MVC.ProjetoA.Home.AbrirCadastro())"><i class="fa fa-file-text-o"></i> Cadastro </a>
</li>

The Controller is no longer with Tempdata and I redirect to an auxiliary method in Project B.

CONTROLLER

[RequiresAuthorization]
public virtual ActionResult AbrirCadastro()
{
    Client dadosUsuario = ViewBag.User;
    return Redirect(Url.SubdomainUrl(SubdomainConstants.Register, MVC.ProjetoB.Home.IndexAuxiliar()));
}

PROJECT B

CONTROLLER

I entered an auxiliary method to fill Tempdata

    [HttpGet]
    public virtual ActionResult IndexAuxiliar()
    {
        TempData["Teste"] = true;
        return RedirectToAction(MVC.ProjetoB.Home.Index());
    }

And in the main method I check whether it is null or not. So, when there is a page re-load, Tempdata will be null, thus achieving my goal.

[HttpGet]
public virtual ActionResult Index()
{
    if (TempData["Teste"] != null)
    {
        //Preencho dropdown de uma maneira
    }
    else
    {
        //Preencho dropdown de outra maneira
    }
    return View();
}