表达式树不能包含动态运算符

Question

我正在尝试连接两个表。用户和计分板

视图模型> ScoreboardVM.cs

public class ScoreboardVM
{
public IEnumerable<dynamic> Scoreboards { get; set; }
}

控制器

var db = new GameDBDataContext();
var userList = (from s in db.Scoreboards
               join u in db.Users on s.User equals u.UserId
               select new { UserName = u.UserName }).Take(5);
var viewModel = new ScoreboardVM();
viewModel.Scoreboards = userList;
return View(viewModel);

视图

@model Project.ViewModels.ScoreboardVM
    @foreach (var item in Model.Scoreboards) {
    @Html.DisplayFor(model => item.UserName) }

最后一行返回错误"表达式树可能不包含动态操作符"，我不确定这是什么意思

Answer 1

您看到的错误是因为公共IEnumerable<dynamic> Scoreboards是动态的，而动态的@foreach (var item in Model.Scoreboards)不支持lambda表达式