MVC視圖返回空值

Question

我正在製作我的MVC應用程序。我正在創建一個表格，裏面有一張表格。一張表應該包含他們擁有的用戶和成績（例如學校的標記表）。我希望這些標記是可修改的，所以我使用TextBox的默認值作爲數據庫中的類型，但顯然，當我按下「Apply changes」按鈕時，控制器將所有標記的列表視爲null。爲什麼這樣？
我的視圖（它的一部分）：

@Scripts.Render("~/bundles/jquery") 
@Scripts.Render("~/bundles/bootstrap") 
@model ClassDeclarationsThsesis.Models.ClassesViewViewModel 


@{ 
    ViewBag.Title = "ClassesView"; 
} 
<h2>ClassesView</h2> 
<select id="sel"> 
    <option value="week">Current week</option> 
    <option value="total">Total</option> 
</select> 
@{ 
    int i = 0; 
    int inside = 0; 
} 
@using (Html.BeginForm("ClassesView", "Account", FormMethod.Post, new { @class = "form-horizontal", role = "form" })) 
{ 
     <div id="week"> 
     <table border="1" width="500"> 
      <tr> 
       <th>Surname</th> 
       <th>Name</th> 
       @foreach (var task in Model.current) 
       { 
        <th>@task.name</th> 
       } 
       <th>Total</th> 
      </tr> 
      @{ 
       int counter = 0; 
       int counter1 = 0; 
      } 
      @foreach (var user in Model.curr_users) 
      { 

       if (user.user_type.Replace(" ", String.Empty) == 1.ToString()) 
       { 

        <tr> 
         <th>@user.surname</th> 
         <th>@user.name</th> 
         @foreach (var task in Model.current) 
         { 
          foreach (var grade in Model.grading) 
          { 
           if (user.user_id == grade.user_id) 
           { 
            if (task.task_id == grade.task_id) 
            { 
             inside = task.value; 
             i = i + task.value; 
             counter1++; 
            } 

           } 

          } 
          <th>@Html.TextBoxFor(m => m.points[counter + counter1 - 1], new { @class = "form-control", @Value = @inside, style = "width:50px;" })</th> 
          inside = 0; 
         } 
         <th> 
          @i 
         </th> 
         @Html.HiddenFor(m => m.class_id) 
         @Html.HiddenFor(m => m.student_id) 
        </tr> 
       } 
       i = 0; 
       counter++; 
      } 
     </table> 
     <input type="submit" class="btn btn-default" value="Apply changes" /> 

    </div> 
       } 

points，我這裏使用的是在ClassesViewViewModelList<int>。我究竟做錯了什麼？
編輯：
添加了控制器：

public ActionResult ClassesView(ClassesViewViewModel value) 
{ 
    ClassDeclarationsDBEntities4 entities = new ClassDeclarationsDBEntities4(); 
    ClassesViewViewModel model = new ClassesViewViewModel(); 
    model.users = entities.Users.ToList(); 
    model.tasks = entities.Tasks.ToList(); 
    model.group_id = value.group_id; 
    model.class_id = value.class_id; 
    model.grading = entities.Gradings.ToList(); 
    model.s_u = entities.Subjects_Users.ToList(); 
    model.t = new List<ClassDeclarationsThsesis.Classes.Task>(); 
    model.current = new List<ClassDeclarationsThsesis.Classes.Task>(); 
    model.curr_users = new List<ClassDeclarationsThsesis.Classes.User>(); 
    DateTime max = DateTime.MinValue; 
    foreach (var task in model.tasks) 
    { 
     if (task.class_id == model.class_id) 
     { 
      model.t.Add(new ClassDeclarationsThsesis.Classes.Task(task.task_id, task.class_id, task.name, task.points, task.deadline)); 
     } 


    } 
    foreach (var task in model.t) 
    { 
     if (DateTime.Compare(task.deadline, max) > 0) 
     { 
      max = task.deadline; 
     } 
    } 
    foreach (var task in model.t) 
    { 
     if (DateTime.Compare(task.deadline, max) == 0) 
     { 
      model.current.Add(task); 
     } 
    } 
    foreach (var s_u in model.s_u) 
    { 
     if (s_u.class_id == model.class_id && s_u.group_id == model.group_id) 
     { 
      foreach (var user in model.users) 
      { 
       if (user.user_id == s_u.user_id) 
       { 
        model.curr_users.Add(new ClassDeclarationsThsesis.Classes.User(user.name, user.surname, user.user_id, user.user_type, user.email, user.password)); 
       } 

      } 
     } 

    } 

    if (ModelState.IsValid) 
    { 
     for(int i=0;i<model.points.Count();i++) 
     { 
      //getting null here 
     } 
    } 
    else 
    { 
     return View(model); 
    } 


    return View(model); 
} 

Answer 1

1）你應該在HttpPost行動方法改變 「價值」 作爲 「樣板」。

public ActionResult ClassesView(ClassesViewViewModel model) 

2）有你的行動method.You應該學習資源庫和服務patterns.Briefly你應該把數據庫讀取，插入了很多線，在存儲庫進行更新線class.You應該倉庫類對於每個實體。業務邏輯（驗證等）必須在服務類中。

Answer 2

好吧，所以我找到了答案。我將控制器中的value更改爲model，並更正了計數器，以確保值從0開始連續。感謝您的支持。