编辑MVC4和Visual Studio 2012中的方法 [英] Edit Method in MVC4 and Visual Studio 2012

问题描述

有人可以帮助我，昨天晚上我发布了这个问题。我仍然坚持使用编辑方法。链接如下：

昨晚的问题

除了发布内容之外，我还试过：

HttpPost Edit：

  [HttpPost] 
 public ActionResult Edit（MensPlayer mensPlayer）
 {
 if（ModelState.IsValid）
 {
 //保存播放器
 _dataSource.Entry（mensPlayer）.State = EntityState.Modified; 
 _dataSource.Save（）; 
 
 TempData [message] = string.Format（{0}已保存，mensPlayer.Name）; 
 return RedirectToAction（Detail，MensPlayer，new {id = mensPlayer.Id}）; 
} 
 return View（mensPlayer）; 
} 
  

上述方法的问题在 Entry mensPlayer）.State ，代码不会在.Entry（）中构建，我似乎不知道这个方法是在继承的。请注意，这是MVC-Music-Store示例中使用的技术。

我还从Pro ASP.NET MVC3框架书中尝试过这种技术。

  [HttpPost] 
 public ActionResult Edit（MensPlayer mensPlayer）
 {
 if（ModelState.IsValid）
 {
 //保存播放器
 _dataSource.Save（）; 
 
 TempData [message] = string.Format（{0}已保存，mensPlayer.Name）; 
 return RedirectToAction（Detail，MensPlayer，new {id = mensPlayer.Id}）; 
} 
 return View（mensPlayer）; 
} 
  

此技术构建，但似乎没有保存对数据库的更改。 / p>

我该怎么办？我缺少什么？

如果有任何人需要查看整个解决方案，整个源代码都在GitHub上。

GitHub

添加了 void Update（）; 到IDataSource并将以下内容添加到Db类

  void IDataSource.Update（）
 {
条目（MensPlayers ）.State = EntityState.Modified; 
} 
  

HttpPost Edit：

  [HttpPost] 
 public ActionResult Edit（MensPlayer mensPlayer）
 {
 if（ModelState.IsValid）
 {
 / / Save Player 
 _dataSource.Update（）; 
 _dataSource.Save（）; 
 
 TempData [message] = string.Format（{0}已保存，mensPlayer.Name）; 
 return RedirectToAction（Detail，MensPlayer，new {id = mensPlayer.Id}）; 
} 
 return View（mensPlayer）; 
} 
  

所有版本，但是我收到这个错误
实体类型DbSet`1不是当前上下文模型的一部分。

据信来源于：

  void IDataSource.Update（）
 {
条目（MensPlayers）.State = EntityState.Modified; 
} 
  

解决方案

在Slauma的帮助下上面的评论是他建议我做的，它的作品。

添加到IDataSource接口：

  void Update（MensPlayer mensPlayer）; 
  

更新在Db类中实现：

  void IDataSource.Update（MensPlayer mensPlayer）
 {
条目（mensPlayer）.State = EntityState.Modified; 
} 
  

编辑操作：

  [HttpPost] 
 public ActionResult Edit（MensPlayer mensPlayer）
 {
 if（ModelState.IsValid）
 {
 / / Save Player 
 _dataSource.Update（mensPlayer）; 
 _dataSource.Save（）; 
 
 TempData [message] = string.Format（{0}已保存，mensPlayer.Name）; 
 return RedirectToAction（Detail，MensPlayer，new {id = mensPlayer.Id}）; 
} 
 return View（mensPlayer）; 
} 
  

只要这一切都正常，虽然我是在假设我可以实现对整个DbSet的更新，就像我用Save一样。

Could someone please help me with the question i posted late last night. I am still stuck with the edit method. Link below:

Last night question

In addition to what was posted, i have also tried:

HttpPost Edit:

[HttpPost]
    public ActionResult Edit(MensPlayer mensPlayer)
    {
        if (ModelState.IsValid)
        {
            //Save Player
            _dataSource.Entry(mensPlayer).State = EntityState.Modified;
           _dataSource.Save();

           TempData["message"] = string.Format("{0} has been saved", mensPlayer.Name);
            return RedirectToAction("Detail", "MensPlayer", new {id = mensPlayer.Id});
        }
        return View(mensPlayer);
    }

The Issue with the above method is around Entry(mensPlayer).State, code will not build at .Entry() and i don't seem to know where this method is being inherited. Mind you, this is the technique used in MVC-Music-Store sample.

I have also tried this technique from Pro ASP.NET MVC3 Framework book.

[HttpPost]
    public ActionResult Edit(MensPlayer mensPlayer)
    {
        if (ModelState.IsValid)
        {
            //Save Player
           _dataSource.Save();

           TempData["message"] = string.Format("{0} has been saved", mensPlayer.Name);
            return RedirectToAction("Detail", "MensPlayer", new {id = mensPlayer.Id});
        }
        return View(mensPlayer);
    }

This technique builds but doesn't seem to save changes to the database.

How can i make it work? What am i missing?

The entire source code is on GitHub if anyone needs to look at the entire solution.

GitHub

With Slauma's help below i have now modified as follows:

Added void Update(); to IDataSource and added the following to the Db class

 void IDataSource.Update()
    {
        Entry(MensPlayers).State = EntityState.Modified;
    }

HttpPost Edit:

[HttpPost]
    public ActionResult Edit(MensPlayer mensPlayer)
    {
        if (ModelState.IsValid)
        {
            //Save Player
            _dataSource.Update();
           _dataSource.Save();

           TempData["message"] = string.Format("{0} has been saved", mensPlayer.Name);
            return RedirectToAction("Detail", "MensPlayer", new {id = mensPlayer.Id});
        }
        return View(mensPlayer);
    }

All builds but then i get this error The entity type DbSet`1 is not part of the model for the current context.

Which is believed to originate from:

void IDataSource.Update()
    {
        Entry(MensPlayers).State = EntityState.Modified;
    }

解决方案

With help of Slauma in the comments above this is what he suggested i do and it works.

Add to IDataSource Interface:

 void Update(MensPlayer mensPlayer);

Update Implemented in Db class:

void IDataSource.Update(MensPlayer mensPlayer)
    {
        Entry(mensPlayer).State = EntityState.Modified;
    }

Edit Action:

[HttpPost]
    public ActionResult Edit(MensPlayer mensPlayer)
    {
        if (ModelState.IsValid)
        {
            //Save Player
            _dataSource.Update(mensPlayer);
           _dataSource.Save();

           TempData["message"] = string.Format("{0} has been saved", mensPlayer.Name);
            return RedirectToAction("Detail", "MensPlayer", new {id = mensPlayer.Id});
        }
        return View(mensPlayer);
    }

And Just like that all works fine, although i was under the assumption that i could implement Update to the whole DbSet like i did with Save.

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