C#•5mo ago

How to pass List<string> from one action to another using TempData

From what I saw on the internet I should do:

using Microsoft.AspNetCore.Mvc;
using System.Collections.Generic;
using Newtonsoft.Json;

public class MyController : Controller
{
    public IActionResult FirstAction()
    {
        List<string> myList = new List<string> { "Item1", "Item2", "Item3" };
        TempData["MyList"] = JsonConvert.SerializeObject(myList);
        
        return RedirectToAction("SecondAction");
    }

    public IActionResult SecondAction()
    {
        List<string> myList = new List<string>();

        if (TempData.ContainsKey("MyList"))
        {
            var myListJson = TempData["MyList"].ToString();
            myList = JsonConvert.DeserializeObject<List<string>>(myListJson);
        }

        ViewBag.MyList = myList;
        return View();
    }
}

using Microsoft.AspNetCore.Mvc;
using System.Collections.Generic;
using Newtonsoft.Json;

public class MyController : Controller
{
    public IActionResult FirstAction()
    {
        List<string> myList = new List<string> { "Item1", "Item2", "Item3" };
        TempData["MyList"] = JsonConvert.SerializeObject(myList);
        
        return RedirectToAction("SecondAction");
    }

    public IActionResult SecondAction()
    {
        List<string> myList = new List<string>();

        if (TempData.ContainsKey("MyList"))
        {
            var myListJson = TempData["MyList"].ToString();
            myList = JsonConvert.DeserializeObject<List<string>>(myListJson);
        }

        ViewBag.MyList = myList;
        return View();
    }
}

But that seems wrong because whenever I try to do the line: var myListJson = TempData["MyList"].ToString(); I get a "cannot implicitly convert error". There should be a way to get back the list right, guys?

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How to pass List<string> from one action to another using TempData