Cast IEnumerable<T> to runtime type

Question

How can achieve something similar to listOfBaseItems.Cast<Child>() using a type defined in runtime? e.g.

var t = typeof(Child); // the type would be a method argument in my case
var desiredType = typeof(List<>).MakeGenericType(t);
var castedList = Convert.ChangeType(listOfBaseItems, desiredType);

I get an exception that the items doesn't implement IConvertible. What am I missing?

Answer 1

Assuming that the cast is legal (e.g. listOfBaseItems actually contains child items), then you can invoke Cast (which is a generic extension method in the Enumerable class) at runtime like this:

var result = 
    typeof(Enumerable)
        .GetMethod("Cast")
        .MakeGenericMethod(t)
        .Invoke(null, new object[] {listOfBaseItems});