如何在mvc控制器中创建视图的重载版本 [英] how to create an overloaded version of a view in mvc controller

问题描述

嘿伙计们，我正在mvc3 web apllication上进行在线录取项目。



i创建了一类学生，并使用一个inerface作为中间人之间的中间人web apllication和我的域名完美保存我的记录。我使用了一个视图向用户呈现表单并将记录保存到数据库中。保存方面工作正常。



但是我想要完成的是保存学生想要2 cahange一些信息，我希望记录被覆盖并且不会在数据库中重新保存。



所以我想创建一个重载版本的视图来实现它。



我试了一下，我得到一个错误，说它无法执行或绑定null参考。

然后我意识到错误是正确的，因为在学生可以编辑之前必须首先保存记录。



但我不能似乎编辑找到一种方法来编辑记录。任何帮助将不胜感激cos am stock ..我的代码如下。

  public  ViewResult注册（ int  id）
 {
学生= studentrepository.Student.FirstOrDefault（p => p.ID == id）; 
 
 
 
  return  查看（学生）; 
} 
 [HttpPost] 
  public  ActionResult注册（学生）
 {
  if （ModelState.IsValid）
 {
 studentrepository。 Save （student）; 
 
} 
 
 
 
  return  图（学生）; 
 
 
 
 
} 

解决方案

要么有一个标志如果条目是新的，则明确地告诉控制器。或者在保存之前检查学生是否已经存在（您需要一个学生特有的数据，如注册号或SSN）

hey guys,am working on an online admission project in mvc3 web apllication.

i have created a class of students and use an inerface as the middle man between the web apllication and my domain to save my records perfectly.i have used a view to present the form to the users and save the record into the database.The saving aspect works perfectly.

But what i want to accomplish is surposing the student want 2 cahange some information after saving,i want the records to be overwritten and not resaved in the database.

so i want to create an overloaded version of my view to accomplish that.

I tried it and i got an error that says that it cannot perform or bind a null reference.
Then i realise the error is correct becos the record has to be saved first before the student can edit.

however i cant seem to edit find a way around editing the record. any help will be appreciated cos am stock..here is my code below.

public ViewResult Registration(int id)
    {
        Student student = studentrepository.Student.FirstOrDefault(p => p.ID == id);



        return View(student);
    }
   [HttpPost]
    public ActionResult Registration(Student student)
    {
        if (ModelState.IsValid)
        {
            studentrepository.Save(student);

        }



        return View(student);




    }

解决方案

Either have a flag that tells the controller explicitely if the entry is new or not. Or check before saving if the student already exists (you'll need one datum that is unique to a student such as registration number or SSN)

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