Create List<> from runtime type

Question

I am looking to create a List, where the type of T is several unrelated classes (with the same constructor arguments) that I know through reflection.

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Answer 1

You're confusing types and the System.Type class for Generic Type Parameters, here is the code to implement it the way you want:

var lt = typeof(List<>);
foreach (Type T in Types)
{
    var l = Activator.CreateInstance(lt.MakeGenericType(T));
    DataBase.Add(l);
}

Answer 2

You could... use List<object> (if you know that your type is a reference type, or boxing is acceptable); or create a List via reflection.

Answer 3

You can use reflection:

List<object> database = new List<object>();
foreach (Type t in Types)
{
   var listType = typeof(List<>).MakeGenericType(t);
   database.Add(Activator.CreateInstance(listType));
}