How to display in View List<string>

Question

In View "Index" output list of users, their names, messages date, messages. And near with every have link "Info". How to display in View "Info" List<string> ListMessage of user after click on link "Info"? Output only is empty table :(

ASP.NET is a hardcore.

This is my Model :

public class User
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Message { get; set; }
    public List<string> ListMessage { get; set; }
    public DateTime Date { get; set; }
}

My Controller:

[HttpPost]
    public ActionResult Index(User user)
    {
        IEnumerable<User> users = db.Users;
        if (user.Name == users.Where(i => i.Name == user.Name).ToString())
        {
            user.ListMessage = new List<string>();
            user.ListMessage.Add(user.Message);          
        }
        user.ListMessage = new List<string>();
        user.ListMessage.Add(user.Message);
        ViewBag.Customers = users;
        user.Date = DateTime.Now;
        db.Users.Add(user);
        db.SaveChanges();            
        return View();
    }
    [HttpGet]
    public ActionResult Info(int id)
    {
        IEnumerable<User> users = db.Users;
        ViewBag.Customers = users;
        var c = new User();
        c.ListMessage = new List<string>();
        ViewBag.Messages = c.ListMessage;
        return View(c.ListMessage);
    }

And View "Info":

 @{ ViewBag.Title = "All messages"; } @using MessageBank.Models @model List<string> <table> <tr> <td><p>Id</p></td> <td><p>Name</p></td> <td><p>Time</p></td> <td><p>Message</p></td> <td></td> </tr> @foreach (var el in Model) { <tr> <td><p>@Html.DisplayFor(m => el)</p></td> <td><p>@el</p></td> </tr> } </table> 

Answer 1

You did not init values for ListMessage. I tried to init c.ListMessage = new List<string> { "Test1", "Test2" };

 [HttpGet]
    public ActionResult Info(int id)
    {
        IEnumerable<User> users = db.Users;
        ViewBag.Customers = users;
        var c = new User();
        c.ListMessage = new List<string> { "Test1", "Test2" };
        ViewBag.Messages = c.ListMessage;
        return View(c.ListMessage);
    }

It show Test1 and Test2 value in the table.

Also not sure why you assign 2 ViewBags without using them?

May be you want c.ListMessage = db.Users.Select(c=>c.Message).ToList() ?

Answer 2

It looks like you want to get the user matching an id . You also need to populate user.ListMessage You could try this:

[HttpGet]
public ActionResult Info(int id)
{
    // get user with user.Id == id
    User user = db.Users.FirstOrDefault(u => u.Id == id);

    if (user == null)
    {
        // handle null
    }

    // populate listmessage
    user.ListMessage = new List<string> { user.Message };

    // send a List<string> to view
    return View(user.ListMessage);
}

Then the table should be populated in the view using the foreach loop.

---

If you prefer, you could return a user to the Info view. In that case you can change to:

[HttpGet]
public ActionResult Info(int id)
{
    User user = db.Users.FirstOrDefault(u => u.Id == id);    

    // populate ListMessage
    user.ListMessage = new List<string> { user.Message };

    // return User model to view    
    return View(user);
}

Then in the view update the foreach to something like this:

@{
    ViewBag.Title = "All messages";
}

@model YourNamespace.Models.User

    <table>   
        <tr>
            <th>Message</th>     
        <tr>           

        @foreach (var el in Model.ListMessage)
        {
            <tr>
                <td>@Html.DisplayFor(m => el)</td>
            </tr>
        }
    </table>

   // you can access Model.Id, Model.Name, Model.Date, Model.Message in this view too

Answer 3

TY all for help!

@haldo Why did you deleted your message? You helped me! Thx!

Model:

[HttpGet]
    public ActionResult Info(int id)
    {
        User user = db.Users.FirstOrDefault(u => u.Id == id);
        user.ListMessage = new List<string>() { user.Message };
        return View(user.ListMessage);
    }

View:

 @{ ViewBag.Title = "All messages"; } @using MessageBank.Models @model IEnumerable<string> <!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width" /> <title>Info</title> </head> <body> <div> <h3>Info</h3> <table> <tr> <td><p>Message</p></td> </tr> @foreach (var el in Model) { <tr> <td><p>@Html.DisplayFor(m => el)</p></td> @*<td><p>@el</p></td>*@ </tr> } </table> @foreach (var el in Model) { <ul> <li><p>@Html.DisplayFor(m => el)</p></li> @*<td><p>@el</p></td>*@ </ul> } </div> </body> </html>