c# - Exclude Property on Update in Entity Framework

Question

I've been looking for a proper way to mark a property to NOT be changed when updating a model in MVC.

For example, let's take this small model:

class Model
{
    [Key]
    public Guid Id {get; set;}
    public Guid Token {get; set;}

    //... lots of properties here ...
}

then the edit method MVC creates looks like this:

[HttpPost]
public ActionResult Edit(Model model)
{
    if (ModelState.IsValid)
    {
        db.Entry(model).State = EntityState.Modified;
        db.SaveChanges();
        return RedirectToAction("Index");
    }
    return View(model);
}

now if my View does not contain the Token, it will be nullified through that edit.

I'm looking for something like this:

db.Entry(model).State = EntityState.Modified;
db.Entry(model).Property(x => x.Token).State = PropertyState.Unmodified;
db.SaveChanges();

The best way so far I found is to be inclusive and set all properties I want included by hand, but I really only want to say which ones to be excluded.

Answer 1

we can use like this

 db.Entry(model).State = EntityState.Modified;
 db.Entry(model).Property(x => x.Token).IsModified = false;
 db.SaveChanges();

it will update but without Token property