Question

Assume I have a class that is unknown until runtime.
At runtime I get a reference, x, of type Type referencing to Foo.GetType().
Only by using x and List<>, can I create a list of type Foo?

How to do that?

Answer 1

Type x = typeof(Foo);
Type listType = typeof(List<>).MakeGenericType(x);
object list = Activator.CreateInstance(listType);

Of course you shouldn’t expect any type safety here as the resulting list is of type object at compile time. Using List<object> would be more practical but still limited type safety because the type of Foo is known only at runtime.