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，播放器列表被添加到控制器中的ViewBag并传递给视图：

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

    return View();
}

但是，当我想添加新结果并从视图的下拉列表中选择两个玩家的名称时，Result对象上的这些Player属性为null。我希望他们能包含Player对象。

填充下拉列表的方式如下：

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

有人可以指出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？

Answer 1

您需要定义下拉列表中的项目。

 <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)

从“下拉列表”中选择一种类型的模型，以在ASP.NET MVC中的另一个模型上填充属性

1 个答案: