gistfile1.txt

using System.Collections;
using System.Collections.Generic;
using System;
using System.Reflection;
using UnityEngine;

public static class AddComp {

 		 public static T GetCopyOf<T>(this Component comp, T other) where T : Component
 {
     Type type = comp.GetType();
     if (type != other.GetType()) return null; // type mis-match
     BindingFlags flags = BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Default | BindingFlags.DeclaredOnly;
     PropertyInfo[] pinfos = type.GetProperties(flags);
     foreach (var pinfo in pinfos) {
         if (pinfo.CanWrite) {
             try {
                 pinfo.SetValue(comp, pinfo.GetValue(other, null), null);
             }
             catch { } // In case of NotImplementedException being thrown. For some reason specifying that exception didn't seem to catch it, so I didn't catch anything specific.
         }
     }
     FieldInfo[] finfos = type.GetFields(flags);
     foreach (var finfo in finfos) {
         finfo.SetValue(comp, finfo.GetValue(other));
     }
     return comp as T;
 }

 public static T AddComponent<T>(this GameObject go, T toAdd) where T : Component
 {
     return go.AddComponent<T>().GetCopyOf(toAdd) as T;
 }
}