Question

What is wrong with this, and should I be doing to pass a type to a generic?

Type t = typeof(string);

var someThing = new SomeThing<t>(100);

Answer 1

You have to use reflection to do this:

var openType = typeof(SomeThing<>);
var constructedType = openType.MakeGenericType(new[] { typeof(string) });
var instance = Activator.CreateInstance(constructedType);

This won’t be that useful though since you will not be able to use the type in a generic way but this approach can be helpful if you need to dynamically construct a generic type for an API call.