c# - How do I duplicate an object?

Question

I have a plans list, or whatever it is, and I don't want any of them to be deleted. That's why when someone choose the "edit" option - I actually want to add a new plan with the same references, but just a new ID. Then, I don't care at all what changes will be made in it in the edit view (which is in fact the create view).

I use the same view whether it create new or edit, but the only difference is that if the action get a plan - I understand it is not create new but edit and then I want to display in the create view all the "edited" plan parameters, and if there isn't any plan (if the action does not get any plan) - I understand it's a totaly new plan (someone choose the "Create new" option), and then I want to display the same view - with blank fields.

Here is my code:

public ActionResult CreatePlan(Plan? plan)
        {
            if (plan == null)
            {
                return View();
            }
            else 
            {
                Plan oldPlan = db.PlanSet.Single(p => p.Id == plan.Value.Id);
                return View(oldPlan);
            }
        }

Currently, as you can see, if the action does get an object - it lets me edit the old plan.

How can I duplicate it so any change that will be made in the view - will be saved with another plan ID??? Hope I made myself clear and am happy to get some help !

Answer 1

I think what you want is: Object.MemberwiseClone().

Object.MemberwiseClone() creates a shallow copy of an object, i.e. it creates a new object and copies the references from the old object (of course, value types are duplicated).

Now, since MemberwiseClone is actually protected, you have to do something like:

public class Plan 
{
    public Plan clone()
    {
        return (Plan)this.MemberwiseClone();
    }
}