Update/Edit an Entry in C# CRUD Operations

Question

I am trying to edit a RoleName in my Roles table. Everything is working except I am getting errors that there is no definition for the Entry and the SaveChanges methods. I have using statements for both System.Data.Entity and EntityFramework so I am not sure what the issue is. I'm pretty sure that I have all the correct packages and references.

//Get Edit
[HttpGet]
public ActionResult Edit(Roles model)
{
    return View(); 
}

//Put Edit
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(Comtrex_ICU.Models.Roles model, int RoleId, 
    Roles RoleName)
{
    try
    {
        Roles db = new Roles();

        db.Entry(RoleName).State = EntityState.Modified;
        db.SaveChanges();

        return RedirectToAction("RolesIndex");
    }
    catch 
    { 
        return View(); 
    }
}

Answer 1

As you don't appear to be calling them from a repository, Entry and SaveChanges are methods belonging to your EntityFramework Entities.

You're trying to call them from an instance of Roles .

You need to instantiate your Entities as db .

Instead of the following:

Roles db = new Roles();

You should do this (where Entities is the name you've given your entities):

Entities db = new Entities();

You can now find the Role you want to edit by using Find :

var editRole = db.Roles.Find(RoleId);

Then you need to map your edited properties and then make your update.

You should instantiate your entities in the constructor of either the Controller or a service repository rather than each time you need it, but the example above should point you in the right direction.