在ASP.NET MVC应用程序中使用实体框架进行排序

Question

i have this Index action method from which i am passing a result , and i want to sort my table through the same Index Action method how can i pass both the value to view. here is my index Action method

public ActionResult Index(string sortOrder)
{
    var userCount = db.CountUser();

    return View(userCount.ToList());
}

and here is my sorting code:

ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? "name_desc" : "";

var teams = from t in db.Teams
            select t;
switch (sortOrder)
{
    case "name_desc":
        teams = teams.OrderByDescending(t => t.TeamName);
        break;

    default:
        teams = teams.OrderBy(t => t.TeamName);
        break;
}

Answer 1

You can achieve that by:

public ActionResult Index(string sortOrder)
{
    var userCount = db.CountUser();

    ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? "name_desc" : sortOrder;

    var teams = from t in db.Teams
                select t;

    switch ((string)ViewBag.NameSortParm)
    {
        case "name_desc":
            teams = teams.OrderByDescending(t => t.TeamName);
            break;

        default:
            teams = teams.OrderBy(t => t.TeamName);
            break;
    }

    ViewBag.Teams = teams.ToList();

    return View(userCount.ToList());
}

And use ViewBag.Teams in your view.

However, proper solution for that I think would be creating a proper Model that contains both collections:

public class MyIndexViewModel
{
    public List<CountUser> CountUsers { get; set; }
    public List<Team> Teams { get; set; }
}

public ActionResult Index(string sortOrder)
{
    var userCount = db.CountUser();

    ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? "name_desc" : sortOrder;

    var teams = from t in db.Teams
                select t;

    switch ((string)ViewBag.NameSortParm)
    {
        case "name_desc":
            teams = teams.OrderByDescending(t => t.TeamName);
            break;

        default:
            teams = teams.OrderBy(t => t.TeamName);
            break;
    }

    return View(new MyIndexViewModel { CountUsers = userCount.ToList(), Teams = teams.ToList() });
}

And also you need to change model type in your View to MyIndexViewModel