Question

I work on windows form application in C#(ver 4.0)

I want to copy a CheckedListBox, but not as reference. I want that every change in the CheckedListBox should not effect my object, just assign once, then no reference.

Following is my code:

public struct SmartFilter
{
    public int from, to;
    public CheckedListBox cmb;            

}
var temp = new SmartFilter();
    temp.from = Convert.ToInt32(cbNumber2From.SelectedItem);
    temp.to = Convert.ToInt32(cbNumber2To.SelectedItem);

    temp.cmb = cbNumbers2;

when I get to the last line

temp.cmb = cbNumbers2;

I want to save a copy in temp.cmb (CheckedListBox) , but after that every change in the window effects my object.

Answer 1

You can’t, basically – CheckedListBox isn’t cloneable.

How would you expect it to operate? It’s an on-screen control… would you expect the clone to just have no parent window, and not be on-screen? How much of the state of the CheckedListBox are you interested in? Maybe you should be copying just that aspect instead of the whole CheckedListBox.

As a side-note, mutable structs are almost always a bad idea, as are public fields.