Edit Method in MVC4 and Visual Studio 2012

问题

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;
    }

回答1:

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.

来源：https://stackoverflow.com/questions/12962737/edit-method-in-mvc4-and-visual-studio-2012