Asp.net mvc 无法隐式转换类型'；System.Collections.Generic.List<；字符串>'；至'；System.Collections.Generic.List<；模型>；Mvc

我遇到问题，无法将类型“System.Collections.Generic.List”隐式转换为“System.Collections.Generic.List” 型号：

---

您正在选择一个用户名列表，因此您将得到一个

列表

，并且您的属性是一个

列表

您的查询正在选择一个包含用户名的字符串列表。并且不能将字符串列表转换为FuelAppoints列表。您应更改为：

 public ActionResult Index()
    {
        var model = new UsersViewModels();
        model.appointmentslist = db.AspNetUsers.Where(
        user => db.FuelerAppointments.Any(f => f.AspNetUserId == user.Id))
       .Select(user => user.FuelerAppointments).ToList();

        return View(model);
    }

---

编译器不允许您这样做。您已将列表声明为

list

，无法将其分配给

String

。如果您在

fuelerappoition

我有两个相同型号的喇叭

 public class FuelerAppointment
{
    public int Id { get; set; }
    public string UserName { get; set; }
    public int AspNetUserId { get; set; }
}

public class AspNetUser
{
    public string UserName { get; set; }
    public int Id { get; set; }
}

和视图模型：

public class UsersViewModels
{
    public List<FuelerAppointment> appointmentslist { get; set; }
}

结果:

---

这可能会有所帮助：我尝试过，但出现错误：System.NotSupportedException:“实体或复杂类型”Startupfuels.Data.FuelerAppoition“无法在LINQ to Entities查询中构造。”（仍然相同，但我可以做到。）

 public class FuelerAppointment
{
    public int Id { get; set; }
    public string UserName { get; set; }
    public int AspNetUserId { get; set; }
}

public class AspNetUser
{
    public string UserName { get; set; }
    public int Id { get; set; }
}

public class UsersViewModels
{
    public List<FuelerAppointment> appointmentslist { get; set; }
}

 [HttpGet]
    public UsersViewModels Get()
    {
        var model = new UsersViewModels
        {
            appointmentslist = (from user in _dbContext.AspNetUsers
                join fuelerAppointment in _dbContext.FuelerAppointments on user.Id equals fuelerAppointment.AspNetUserId
                select new FuelerAppointment { UserName = user.UserName }).ToList()
        };

        return model;
    }