使用 viewbag 发送数据

Question

我正在做一个项目。我需要从数据库中获取几个数据并发送到视图。我已经有一个数据列表。我还想通过 viewbag 发送我的另一个数据。我从数据库中查询了我的相关数据。

类控制器.cs

public ActionResult ClassTeacherDetail(int id)
        {

            ViewBag.dgr = db.Teachers.Where(m => m.Id == id).FirstOrDefault();


            var myList = (from t in db.Appointments
                     from d in t.WeekDays
                     where t.TeacherId == id
                     select new { DayName=d.Name, WHours=t.Hours }
                ).ToList();


            // Get the languages which can be learned by the teacher based on teacher id
            var query = from t in db.Teachers.Where(x => x.Id == id)
                        from l in t.Languages
                        select new
                        {
                            LangName = l.Name,
                        };
            var list = new List<Language>();
            foreach (var item in query)
            {
                list.Add(new Language()
                {
                    Name = item.LangName
                });
            }

            return View(list);
        }

enter image description here

如您所见，我从不同的表格中获取了工作时间和天数。顺便问一下，myList 的类型是什么？如果我将其发送给查看，模型类型将是什么？

如何传递 myList？

Answer 1

myList 是一个Anonymous object 类型的列表，这没有什么问题，但很难跟踪。我们需要做的是为它创建一个类/模型，然后创建一个包含这两个变量的视图模型。

1. 为 myList 匿名对象制作模型或视图模型，我使用的是 TeacherAppointment；

// if the property/data type doesn't match with your Appointments model, please change accordingly
public class TeacherAppointment {
   public string DayName {get;set;}
   public string WHours {get;set;}
}

1. 更新 myList LINQ 以将其存储到 TeacherAppointment 对象。 myList 现在是List<TeacherAppointment>

var myList = (from t in db.Appointments
                from d in t.WeekDays
                where t.TeacherId == id
                select new TeacherAppointment { DayName=d.Name, WHours=t.Hours }
              ).ToList();

1. 创建一个包含 2 个模型的视图模型。

public class TeacherDetailViewModel{
   public List<TeacherAppointment> TeacherAppointments {get;set;}
   public List<Language> Languages {get;set;}
}

4. 在您看来，您应该使用；

@model TeacherDetailViewModel

5. 您的控制器代码应该是；

public ActionResult ClassTeacherDetail(int id)
        {

            ViewBag.dgr = db.Teachers.Where(m => m.Id == id).FirstOrDefault();


            var myList = (from t in db.Appointments
                     from d in t.WeekDays
                     where t.TeacherId == id
                     select new TeacherAppointment { DayName=d.Name, WHours=t.Hours }
                ).ToList();


            // Get the languages which can be learned by the teacher based on teacher id
            var query = from t in db.Teachers.Where(x => x.Id == id)
                        from l in t.Languages
                        select new
                        {
                            LangName = l.Name,
                        };
            var list = new List<Language>();
            foreach (var item in query)
            {
                list.Add(new Language()
                {
                    Name = item.LangName
                });
            }

            // instantiate view model
            TeacherDetailViewModel tdvm = new TeacherDetailViewModel();

            // assign myList and list to TeacherDetailViewModel
            tdvm.TeacherAppointments = myList;
            tdvm.Languages = list;

            // Pass tdvm to the view
            return View(tdvm);
        }

6. 再次在你的视野中，如果你想循环；

@foreach(var a in Model.TeacherAppointments){
   ...
}

@foreach(var b in Model.Languages){
   ...
}