Clone derived class from base class method

Question

I have an abstract base class Base which has some common properties, and many derived ones which implement different logic but rarely have additional fields.

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Answer 1

Found this question while trying to solve this exact problem, had some fun with LINQPad while at it. Proof of concept:

void Main()
{
    Person p = new Person() { Name = "Person Name", Dates = new List() { DateTime.Now } };

    new Manager()
    {
        Subordinates = 5
    }.Apply(p).Dump();
}

public static class Ext
{
    public static TResult Apply(this TResult result, TSource source) where TResult: TSource
    {
        var props = typeof(TSource).GetProperties(BindingFlags.Public | BindingFlags.Instance);
        foreach (var p in props)
        {
            p.SetValue(result, p.GetValue(source));
        }

        return result;
    }
}

class Person 
{
    public string Name { get; set; }
    public List Dates { get; set; }
}

class Manager : Person
{
    public int Subordinates { get; set; }
}