Get the selected value of a DropDownList. Asp.NET MVC

Question

I\'m trying to populate a DropDownList and to get the selected value when I submit the form:

Here is my model :

public class Book
{
    public Book         


        

Answer 1

You can use DropDownListFor as below, It so simpler

@Html.DropDownListFor(m => m.Id, new SelectList(Model.Books,"Id","Name","1"))

(You need a strongly typed view for this -- View bag is not suitable for large lists)

   public ActionResult Action(Book model)
   {
        if (ValidateFields()
        {
            var Id = model.Id;
        ...        

I think this is simpler to use.

Answer 2

In HTML a dropdown box sends only simple scalar values. In your case that would be the id of the selected book:

@Html.DropDownList("selectedBookId", (SelectList)ViewBag.Books)

and then adapt your controller action so that you will retrieve the book from the id that gets passed to your controller action:

[Authorize]
[HttpPost]
public ActionResult Action(string selectedBookId)
{
    if (ValidateFields()
    {
        Book book = FetchYourBookFromTheId(selectedBookId);
        var data = GetDatasAboutBookSelected(book);
        ViewBag.Data = data;
        return View();
    }
    return View();
}