Is possible to cast a variable to a type stored in another variable?

Question

This is what I need to do:

object foo = GetFoo();
Type t = typeof(BarType);
(foo as t).FunctionThatExistsInBarType();

Can something like this be done?

Answer 1

You can use the Convert.ChangeType method.

object foo = GetFoo(); 
Type t = typeof(string);
string bar = (string)Convert.ChangeType(foo, t);

Answer 2

No, you cannot. C# does not implement duck typing.

You must implement an interface and cast to it.

(However there are attempts to do it. Look at Duck Typing Project for an example.)