Question

What am I missing below? When I try list.Clone() Clone doesn’t show up in list.

https://stackoverflow.com/a/222640/139698

class Program
{
    static void Main(string[] args)
    {
        List<Customer> list = new List<Customer>();
        list.Clone() //There is no Clone method in the list
    }
}

public static class Extensions
{
    public static IList<T> Clone<T>(this IList<T> listToClone) where T : ICloneable
    {
        return listToClone.Select(item => (T)item.Clone()).ToList();
    }
}

public class Customer
{
    public string ContactName { get; set; }
    public string City { get; set; }
}

Answer 1

You will need to implement ICloneable interface on Customer class. Also as the extension method has been defined for IList<T> where T is ICloneable, you may want to use below syntax

        IList<Customer> list = new List<Customer>();
        list.Clone(); 

The Clone() extension method will not be visible if Customer doesn’t implement ICloneable