.net - How Can I add properties to a class on runtime in C#?

Question

I have a class :

class MyClass 
{
}
...
MyClass c = new MyClass();

Is it possible to add properties / fields to this class on run-time ?

(I don't know what are their types or names on compile-time and they don't have a common interface which I can use.)

psuedo example :

 Add property named "Prop1" [type System.Int32]
 Add property named "Prop900" [type System.String]

I already read this question but it uses interface

Thanks in advance.

Answer 1

You cannot extend an existing class with new members at runtime. However, you can create a new class using System.Reflection.Emit that has the existing class as base class.

typeBuilder.SetParent(typeof(MyClass));
typeBuilder.DefineProperty("Prop1", ..., typeof(System.Int32), null);
...

See TypeBuilder.DefineProperty Method (String, PropertyAttributes, Type, Type[]) for a full example.