c# - 在 MVC3 上的 CheckBox 列表中填充和检索数据

Question

我的视图上有用户列表：

foreach (var user in (List<GetWorkDone.Model.Accounts.User>)ViewBag.users)
{
}

用户是：

public class User
{
    public int UserId { get; set; }
    public string Name { get; set; }
}

我需要在 CheckBoxes 中显示用户列表并仅在 ActionResult 中选择 CheckBoxes：

public ActionResult AssignUser(List<User> users)
{
}

Answer 1

使用视图模型：

public class UserViewModel
{
    public int UserId { get; set; }
    public string Name { get; set; }
    public boolean IsSelected { get; set; }
}

进而：

public class UsersController: Controller
{
    public ActionResult Index()
    {
        var users = new UserViewModel[]
        {
            // TODO: obviously those could come from a database or something
            new UserViewModel { UserId = 1, Name = "user 1" },
            new UserViewModel { UserId = 2, Name = "user 2" },
            new UserViewModel { UserId = 3, Name = "user 3" },
        };
        return View(users);
    }

    public ActionResult Index(UserViewModel[] users)
    {
        ... you could inspect the IsSelected property of each user here        
    }
}

最后有一个强类型视图：

@model UserViewModel[]
@using (Html.BeginForm())
{
    @for (var i = 0; i < Model.Length; i++)
    {
        <div>
            @Html.HiddenFor(x => x[i].UserId)
            @Html.HiddenFor(x => x[i].Name)
            @Html.DisplayFor(x => x[i].Name)
            @Html.CheckBoxFor(x => x[i].IsSelected)
        </div>
    }
    <button type="submit">OK</button>
}

如果您已经有其他模型，那么，调整它并使用视图模型：

public class AssignUserViewModel
{
    public UserViewModel[] Users { get; set; }

    ... some other properties that you already have
} 

进而：

@model AssignUserViewModel

@using (Html.BeginForm())
{
    @for (var i = 0; i < Model.Users.Length; i++)
    {
        <div>
            @Html.HiddenFor(x => x.Users[i].UserId)
            @Html.HiddenFor(x => x.Users[i].Name)
            @Html.DisplayFor(x => x.Users[i].Name)
            @Html.CheckBoxFor(x => x.Users[i].IsSelected)
        </div>
    }

    ... some other fields

    <button type="submit">OK</button>
}

结论：始终使用视图模型。