Prevent TempData from becoming null on view reload

TempDatait has a very short time to live (only until it finishes loading the view).

As an alternative instead of you TempDatacould use Sessionthat will keep the data for the duration sessionor until you delete it manually.

public ActionResult Sucursales(string rfcCompany)
{
  model.CuentaUser = CuentaUser;
  Session["RFCCompany"] = rfcCompany;
  return View(model);
}


public ActionResult DetalleSucursal(int id, int idEmpresa, string CuentaUser)
{
  ComprobantesModel model = new ComprobantesModel();
  model.idEmpresa = idEmpresa;
  model.idSucursal = id;
  model.CuentaUser = CuentaUser;
  ViewBag.RFCCompany = Session["RFCCompany"] as string;
  return View(model);
}

If you do not want to use a session variable, it is appropriate to use the TempDatain conjunction with the method Keepto carry the information between redirects . The official documentation says:

The data in a TempDataDictionary object persists only from one request to the next, unless you mark one or more keys for retention using the Keep.

To keep all the dictionary entries TempDatais with:

TempData.Keep();

To hold a dictionary entry TempDatayou have to specify a key:

TempData.Keep("RFCCompany");

In your case and a test that I carried out and it worked for me was that Controllerthe value is specified in the same way that you defined it:

public ActionResult Sucursales(string rfcCompany)
{
    model.CuentaUser = CuentaUser;
    TempData["RFCCompany"] = rfcCompany;//solo para evitar mandar el rfc por la url nuevamente
    return View(model);
}

You would only have to add the following code segment on the view side, the place does not matter but for the organization of the code I would recommend that it be at the beginning:

@{
    TempData.Keep("RFCCompany");
}

In this way, for future redirects , the information would be traveling between the requests.

References:

• https://msdn.microsoft.com/en-us/library/system.web.mvc.tempdatadictionary(v=vs.118).aspx
• https://msdn.microsoft.com/en-us/library/system.web.mvc.tempdatadictionary.keep(v=vs.118).aspx

An alternative is to save the client-side information with either localStorageor sessionStorage( Web Storage).

To find out if a browser supports Web Storageit, we use this code snippet:

if (typeof(Storage) !== "undefined") {
    // Si soporta Web Storage.
} else {
    // Lo siento! No Soporta Web Storage tu navegador...
}

It sessionStorageis now accessible for the duration of the browsing session. Data is not recoverable if:

1. The browser closes and reopens.
2. A new independent browsing tab is opened and you continue to navigate in that tab.
3. The browser window that was being used is closed and another one is opened.

Example obtained from w3school:Demo w3school sessionStorage

function clickCounter() {
  if (typeof(Storage) !== "undefined") {
    if (sessionStorage.clickcount) {
      sessionStorage.clickcount = Number(sessionStorage.clickcount) + 1;
    } else {
      sessionStorage.clickcount = 1;
    }
    document.getElementById("result").innerHTML = "You have clicked the button " + sessionStorage.clickcount + " time(s) in this session.";
  } else {
    document.getElementById("result").innerHTML = "Sorry, your browser does not support web storage...";
  }
}

<p><button onclick="clickCounter()" type="button">Click me!</button></p>
<div id="result"></div>
<p>Click the button to see the counter increase.</p>
<p>Close the browser tab (or window), and try again, and the counter is reset.</p>

This is the most adaptable to my problem since I do not require the data to be kept for a long time as localStorage is.

But what if we wanted to store that information beyond a session and make it available whether the browser is closed and reopened or if we continue browsing in a different window than the initial one?

This tries to be answered by localStorage. This object has the same properties and methods as sessionStorage, but its persistence goes beyond the session.

Data is not recoverable if:

1. The browser cache is cleared.

Example obtained from w3school:Demo w3school localStorage

function clickCounter() {
  if (typeof(Storage) !== "undefined") {
    if (localStorage.clickcount) {
      localStorage.clickcount = Number(localStorage.clickcount) + 1;
    } else {
      localStorage.clickcount = 1;
    }
    document.getElementById("result").innerHTML = "You have clicked the button " + localStorage.clickcount + " time(s).";
  } else {
    document.getElementById("result").innerHTML = "Sorry, your browser does not support web storage...";
  }
}

<p><button onclick="clickCounter()" type="button">Click me!</button></p>
<div id="result"></div>
<p>Click the button to see the counter increase.</p>
<p>Close the browser tab (or window), and try again, and the counter will continue to count (is not reset).</p>