Inheritance of type of observable collection

Question

I have the following classes.

Car.cs

public class Car 
    {
   
   }

scoda.cs

public class scoda : Car
    {
   
    }

Test.cs

 public class Test
    {
       public ObservableCollection<scoda> scodaList;
        public Test()
        {
            scodaList = new ObservableCollection<scoda>();
            scoda s = new scoda();
            scodaList.Add(s);
            set(scodaList);
        }

        public void set(ObservableCollection<Car> list)
        {

        }
    }

I got the casting error when calling set method as below

Cannot convert from 'System.Collections.ObjectModel.ObservableCollection<KillCarMain.deneme.scoda>' to 'System.Collections.ObjectModel.ObservableCollection<KillCardMain.deneme.Car>'

How to fix this problem ?

Answer 1

As pointed out in the comment, a collection of Car is not a collection of Scoda. So you should convert your collection of Scoda into a collection of Car:

var carList = new ObservableCollection<Car>(scodaList.Select(s => (Car)s));
set(carList);

If you don't want to create a new ObservableCollection, you could define scodaList as a collection of Car objects:

public ObservableCollection<Car> scodaList;

private void test() 
{
    scodaList = new ObservableCollection<Car>();
    scoda s = new scoda();
    scodaList.Add(s);
    set(scodaList);
}
public void set(ObservableCollection<Car> list)
{

}