Parameter passing between actions

asp.net-mvc

Solution

You can pass only primitive types in redirect, you can use the `TempData` for complicated types.

[HttpPost]
public ActionResult Search(string cnpj) // starts here
{
    List<Client> Client = db.Client // it always find one client
        .Where(c => cnpj.Equals(c.Cnpj))
        .ToList();

    TempData["client"] = Client;  //<=================
    return RedirectToAction("Index");
}

public ActionResult Index()
{
    var Client = TempData["client"];  //<=================

    if (Client != null)
        return View(Client);

    return View(db.Client.ToList());
}

Basically `TempData` is just like saving data in the `Session` but the data will be deleted automatically in the end of the request where it was read.

`TempData` on MSDN

Notes:

- The common naming convention in `C#` defined private variable to be camel-case. `client` instead of `Client`.

- For `List<Client>` variable I would use `clients` as a name instead of `client`.

- You should use a resource for the `"client"` string so it won't get out of sync, meaning one method puts the data in `"Client"` while the other looking for it in `"client"` or `"Client Data"`

Problem

I tried this: ``` public ActionResult Index() // << it starts here { return RedirectToAction("ind", new { name = "aaaaaaa" }); } [ActionName("ind")] public ActionResult Index(string name)// here, name is 'aaaaaaa' { return View(); } ``` and it works.. so, I tried this: ``` [HttpPost] public ActionResult Search(string cnpj) // starts here { List<Client> Client = db.Client // it always find one client .Where(c => cnpj.Equals(c.Cnpj)) .ToList(); return RedirectToAction("Index", Client); // client is not null } public ActionResult Index(List<Client> Client) //but when goes here, client is always null { if (Client != null) return View(Client); return View(db.Client.ToList()); } ``` Why it happens? Is there something wrong with the second code block?

Original source