c# - 从下拉列表中选择一种类型的模型以填充 ASP.NET MVC 中另一个模型的属性

Question

我有一个名为 Player 的模型:

public class Player
{
    public int ID { get; set; }
    public string Name { get; set; }
    public int Wins { get; set; }
    public int Draws { get; set; }
    public int Losses { get; set; }
    public int League { get; set; }
    [Display(Name="GF")]
    public int GoalsFor { get; set; }
    [Display(Name="GA")]
    public int GoalsAgainst { get; set; }

    public int Points
    {
        get { return Wins * 3 + Draws; }
    }
}

.. 和另一个名为 Result 的模型:

public class Result
{
    public int ID { get; set; }
    public Player Winner { get; set; }
    public Player Loser { get; set; }
    public bool Draw { get; set; }
    [Display(Name="Player A")]
    public Player PlayerA { get; set; }
    [Display(Name = "Player B")]
    public Player PlayerB { get; set; }
    [Display(Name = "Player A Goals")]
    public int PlayerAGoals { get; set; }
    [Display(Name = "Player B Goals")]
    public int PlayerBGoals { get; set; }
}

当我想创建一个新结果时，玩家列表被添加到 Controller 中的 ViewBag 并传递给 View :

public ActionResult Create()
{
    IEnumerable<Player> players = db.Players.ToList();
    ViewBag.Players = new SelectList(players, "Name", "Name");

    return View();
}

但是，当我想添加一个新结果并从 View 的下拉列表中选择两个玩家的名字时，Result 对象上的这些 Player 属性为空。我希望它们包含 Player 对象。

下拉列表的填充方式是这样的:

@Html.LabelFor(model => model.PlayerA, new { @class = "control-label col-md-2" })
@Html.DropDownList("Players", "-- Select Player --")

有人可以指出正确的方向，告诉我如何在下拉列表中正确填充这些属性，或者如何将 Player 对象正确分配给 Result.PlayerA 和 Result.PlayerB 属性吗？

Answer 1

您需要定义下拉列表的项目。

 <div class="editor-field">
        @{
            List<SelectListItem> items = new List<SelectListItem>();
                //You may want to loop to generate your items.                 
                items.Add(new SelectListItem
                {
                    //Or you code that generates your SelectListItems
                    Text = "Your_Text_1", 
                    Value = "Your Value_1",
                });
            items.Add(new SelectListItem
                {
                    //Or you code that generates your SelectListItems
                    Text = "Your_Text_2", 
                    Value = "Your_Value_2",
                });
        }
        @Html.DropDownListFor(model => model.PlayerA, items)           
        @Html.ValidationMessageFor(model => model.PlayerA)