模型列表未从视图返回到Controller [英] Model list is not returning to the Controller from view

问题描述

i有以下学生课程

  public   class 学生
 {
  public   int  stdId { set ;  get ; } 
  public   string  stdName { get ;  set ; } 
  public   string  dept { get ;  set ; } 
} 

和我的控制器代码是

  public  ActionResult Student（）
 {
 
 List< Student> lstStd =  new 列表< Student>（）{ new 学生（）
 {stdId = < span class =code-digit> 103 ，stdName =   bharath，dept =   CSE}，
  new  Student（）{stdId =  104 ，stdName =   Hari，dept =   IT}}; 
 
  return 查看（lstStd）; 
} 
 
 [HttpPost] 
  public  ActionResult学生（IEnumerable< Student> lstStd）
 {
  return  View（）; 
} 
 

和查看代码是

 @使用NewMVC.Models 
 @model IEnumerable< Student> 
< h2> 
 @using（Html.BeginForm（））
 {
  foreach （ var  data  in  Model）
 {
< table> 
< tr> 
< td>学生姓名  
 < /   td  >  
< td> @ Html.TextBoxFor（p = >  data.stdId）< /   td  >  
 < /   tr  >  
< tr> 
< td>学生ID   
 < /   td  >  
< td> @ Html.TextBoxFor（p = >  data.stdName）< /   td  >  
 < /   tr  >  
< tr> 
< td>学生部  
 < /   td  >  
< td> @ Html.TextBoxFor（p = >  data.dept）< /   td  >  
 < /   tr  >  
 < /   table  >  
} 
< input type =   submit  value  =  创建 name =   hi /> 
} 
 < /   h2  >  

当我试图从视图中获取绑定的模型数据时，List< student>即将到来。



任何人都可以帮我找到解决方案。



谢谢提前..

解决方案

你好，我希望这对你有用..改为使用这个

 List < span class =code-keyword><  学生 >  lstStd = new List <  学生 > （）{ new Student（）
 {stdId = 103，stdName =bharath，dept =CSE}，
 new Student（）{stdId = 104，stdName =Hari，dept =IT使用
 
 
列表<  学生 >  lstStd = new List <  学生 > （）; 
 
 lstStd.add（
 {new Student（）
 {stdId = 103，stdName =bharath，dept =CSE}}）; 
 lstStd.add（
 new Student（）{stdId = 104，stdName =Hari，dept =IT}}）; 
 
 
 
 
返回查看（lstStd）; 
 
 
 
如果这不起作用那么请给我评论发生了什么...... 
 
 
 
 ok 

您好b $ b

我对您的来源做了一些小改动。请检查。

  public   class  StudentController：Controller 
 {
  //    
  //   GET：/ Student /  
 
  public  ActionResult Student（）
 {
 StudentList stdlist =  new  StudentList（）; 
 
列表< student> lstStd =  new 列表< student>（）{ new 学生（）
 {stdId = < span class =code-digit> 103 ，stdName =   bharath，dept =   CSE}，
  new  Student（）{stdId =  104 ，stdName =   Hari，dept =   IT}}; 
 
 stdlist.students = lstStd; 
  return 查看（stdlist）; 
} 
 
 [HttpPost] 
  public  ActionResult学生（StudentList stdlst）
 {
  return  View（）; 
} 
 
} 
  public   class  StudentList 
 {
  public 列表< student>学生{获取;  set ; } 
} 
  public   class 学生
 {
  public   int  stdId { set ;  get ; } 
  public   string  stdName { get ;  set ; } 
  public   string  dept { get ;  set ; } 
} 
 

查看

 @model MyMvcApp.Web.UI.Controllers.StudentList 
 
< h2> 
 @using（Html.BeginForm（））
 {
  for （ int  i =  0 ; i <  Model.students.Count（）; i ++） 
 {
< table> 
< tr> 
< td>学生姓名  
 < /   td  >  
< td> @ Html.TextBoxFor（p = >  Model.students [i] .stdId）< /   td  < span class =code-keyword>>  
 < /   tr  >  
< tr> 
< td>学生ID   
 < /   td  >  
< td> @ Html.TextBoxFor（p = >  Model.students [i] .stdName）< /   td  < span class =code-keyword>>  
 < /   tr  >  
< tr> 
< td>学生部  
 < /   td  >  
< td> @ Html.TextBoxFor（p = >  Model.students [i] .dept）< /   td  < span class =code-keyword>>  
 < /   tr  >  
 < /   table  >  
} 
< input type =  提交  value  =   create name =   hi /> 
} 
 < /   h2  >  

请检查以下网址，您可能会知道为什么它不能与foreach合作。< br $> b $ b

http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx/ [ ^ ]

使用以下语法：

 @ using（Html.BeginForm（动作名称，控制器名称））

例如在您的代码中

 @ using（Html.BeginForm（学生，学生））

向代码隐藏添加断点以检查执行流程

Hi,

i have a student class like below

public class Student
    {
        public int stdId { set; get; }
        public string stdName { get; set; }
        public string dept { get; set; }
    }

and my controller code is

public ActionResult Student()
       {

           List<Student> lstStd = new List<Student>() { new Student()
           { stdId = 103, stdName = "bharath", dept = "CSE" },
           new Student() { stdId = 104, stdName = "Hari", dept = "IT" } };

           return View(lstStd);
       }

       [HttpPost]
       public ActionResult Student(IEnumerable<Student> lstStd)
       {
           return View();
       }

and View code is

@using NewMVC.Models
@model IEnumerable<Student>
<h2>
    @using (Html.BeginForm())
    {
        foreach (var data in Model)
        {
        <table>
            <tr>
                <td>Student Name is
                </td>
                <td>@Html.TextBoxFor(p => data.stdId)</td>
            </tr>
            <tr>
                <td>Student Id is
                </td>
                <td>@Html.TextBoxFor(p => data.stdName)</td>
            </tr>
            <tr>
                <td>Student Dept is
                </td>
                <td>@Html.TextBoxFor(p => data.dept)</td>
            </tr>
        </table>
        }
        <input type="submit" value="create" name="hi" />
    }
</h2>

when i am trying to get the binded model data from the view,the List<student> is coming as null.

Can any one please help me in finding the solution.

Thanks in advance..

解决方案

hello i hope this works for you.. used instead this

List<Student> lstStd = new List<Student>() { new Student()
           { stdId = 103, stdName = "bharath", dept = "CSE" },
           new Student() { stdId = 104, stdName = "Hari", dept = "IT" } };

use

List<Student> lstStd = new List<Student>() ;

lstStd.add(
{ new Student()
           { stdId = 103, stdName = "bharath", dept = "CSE" }});
lstStd.add(
           new Student() { stdId = 104, stdName = "Hari", dept = "IT" }} );

return View(lstStd);

if this not work then please give me comment what is happen...

ok

Hi
I made a small change in your source. Please check.

public class StudentController : Controller
  {
      //
      // GET: /Student/

      public ActionResult Student()
      {
          StudentList stdlist = new StudentList();

          List<student> lstStd = new List<student>() { new Student()
          { stdId = 103, stdName = "bharath", dept = "CSE" },
          new Student() { stdId = 104, stdName = "Hari", dept = "IT" } };

          stdlist.students = lstStd;
          return View(stdlist);
      }

      [HttpPost]
      public ActionResult Student(StudentList stdlst)
      {
          return View();
      }

  }
  public class StudentList
  {
      public List<student> students { get; set; }
  }
  public class Student
  {
      public int stdId { set; get; }
      public string stdName { get; set; }
      public string dept { get; set; }
  }

View

   @model MyMvcApp.Web.UI.Controllers.StudentList

<h2>
    @using (Html.BeginForm())
    {
       for(int i = 0; i < Model.students.Count(); i ++)
        {
        <table>
            <tr>
                <td>Student Name is
                </td>
                <td>@Html.TextBoxFor(p => Model.students[i].stdId)</td>
            </tr>
            <tr>
                <td>Student Id is
                </td>
                <td>@Html.TextBoxFor(p =>  Model.students[i].stdName)</td>
            </tr>
            <tr>
                <td>Student Dept is
                </td>
                <td>@Html.TextBoxFor(p =>  Model.students[i].dept)</td>
            </tr>
        </table>
        }
        <input type="submit" value="create" name="hi" />
    }
</h2>

Please check the following url, you may get some idea why it is not working with foreach.

http://haacked.com/archive/2008/10/23/model-binding-to-a-list.aspx/[^]

use following syntax:

@using (Html.BeginForm(Action name,controller name))

eg in your code

@using (Html.BeginForm(student,student))

Add breakpoints to codebehind to check flow of the execution

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