c# - 在 MVC 中返回列表会导致错误

Question

我正在尝试返回教育系统中的时间表列表。我的项目中有一个具有此属性的计划模型:

public partial class Schedule
{
    public Schedule()
    {
        this.ClassTimes = new HashSet<ClassTime>();
        this.Scores = new HashSet<Score>();
    }

    public int Id { get; set; }
    public int TeacherId { get; set; }
    public int LessonId { get; set; }
    public int ClassId { get; set; }
    public int DegreeId { get; set; }
    public int FacultyId { get; set; }
    public int SemesterId { get; set; }
    public int MajorId { get; set; }
    public System.DateTime DateOfExame { get; set; }
    public string Capacity { get; set; }
    public string locationOfExame { get; set; }

    public virtual Class Class { get; set; }
    public virtual ICollection<ClassTime> ClassTimes { get; set; }
    public virtual Degree Degree { get; set; }
    public virtual Faculty Faculty { get; set; }
    public virtual Lesson Lesson { get; set; }
    public virtual Major Major { get; set; }
    public virtual ICollection<Score> Scores { get; set; }
    public virtual Semester Semester { get; set; }
    public virtual Teacher Teacher { get; set; }
}

所以在这个模型中，我保存了我的实体的 id，例如专业、教师、类(class)等。所以我需要返回我的日程表列表。所以我必须将实体的 id 转换为该实体的名称。所以我在我的 MVC 项目中设计了一个调度 Controller ，如下所示:

private readonly ScheduleRepositor obj = new ScheduleRepositor();

public ActionResult Index()
{
    var list=new List<SchedulePresentation>();
    ClassRepository objclassrep=new ClassRepository();
    DegreeRepositor objdegreerep=new DegreeRepositor();
    FacultyRepositor objfactulyrep=new FacultyRepositor();
    LessonRepository objLessonRep=new LessonRepository();
    MajorRepository objmajorrep=new MajorRepository();
    SemesterRepositor objsemesterrep=new SemesterRepositor();
    TeacherRepositor objteacherrep=new TeacherRepositor();
    DateConverter objdateconverte = new DateConverter();
    List<Schedule> model = obj.GetLessonlist();
    foreach (var t in model)
    {
       SchedulePresentation objpres=new SchedulePresentation();
        objpres.Capacity = t.Capacity;
        objpres.DateOfExam = objdateconverte.ConvertToPersianToShow(t.DateOfExame);
        objpres.className = objclassrep.FindClassById(t.ClassId).ClassName;
        objpres.degreeName = objdegreerep.FindDegreeById(t.DegreeId).DegreeName;
        objpres.examLocation = t.locationOfExame;
        objpres.facultyName = objfactulyrep.FindFacultyById(t.FacultyId).FacultyName;
        objpres.lessonName = objLessonRep.FindLessonById(t.LessonId).LessonName;
        objpres.majorName = objmajorrep.FindMajorById(t.MajorId).MajorName;
        objpres.semesterName = objsemesterrep.FindSemesterById(t.SemesterId).SemesterName;
        objpres.teacherName = objteacherrep.FindTeacherById(t.TeacherId).Name + " " +
                              objteacherrep.FindTeacherById(t.TeacherId).LastName;
        list.Add(objpres);

    }

    return View(list);
}

所以我只是为每个实体创建一个存储库，以通过 id 返回我的实体的名称。

然后我为我的日程表创建了一个表示类，将 id 转换为我的实体名称，如下所示:

public class SchedulePresentation
{
    public string teacherName { set; get; }
    public string lessonName { set; get; }
    public string className { set; get; }
    public string degreeName { set; get; }
    public string facultyName { set; get; }
    public string semesterName { set; get; }
    public string majorName { set; get; }
    public string DateOfExam { set; get; }
    public string Capacity { set; get; }
    public string examLocation { set; get; }
}

所以我有两个问题。我的解决方案中有 4 个项目:

1. 领域类
2. 模型
3. 存储库
4. MVC项目

所以

1. 我将这些 Id 转换为它们在 MVC 层中的名称是一个好方法，还是为这个时间表列表制作一个 Repository 或创建一个模型更好？

2. 在最后一行，当我想返回我的列表时，我得到了这个错误:

   传入字典的模型项的类型为“System.Collections.Generic.List1[EducationMVC.PresentationClass.SchedulePresentation]”，但此字典需要一个类型为“System.Collections.Generic”的模型项。 IEnumerable1[DomainClasses.Schedule]'。

MVC的 View 代码:

@model IEnumerable<DomainClasses.Schedule>

@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
<table>
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.TeacherId)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.LessonId)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.ClassId)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.DegreeId)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.FacultyId)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.SemesterId)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.MajorId)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.DateOfExame)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Capacity)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.locationOfExame)
        </th>
        <th></th>
    </tr>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.TeacherId)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.LessonId)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.ClassId)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.DegreeId)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.FacultyId)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.SemesterId)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.MajorId)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.DateOfExame)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Capacity)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.locationOfExame)
        </td>
        <td>
            @Html.ActionLink("Edit", "Edit", new { id=item.Id }) |
            @Html.ActionLink("Details", "Details", new { id=item.Id }) |
            @Html.ActionLink("Delete", "Delete", new { id=item.Id })
        </td>
    </tr>
}

</table>

Answer 1

你的 View 可能有一个像这样的强类型模型

@model IEnumerable<DomainClasses.Schedule>

但您返回的是 List<SchedulePresentation> .

一种解决方案是将模型行更改为:@model IEnumerable<SchedulePresentation> .