Inheritance: ScriptObject
 public UserdataPairs(Script script, ScriptUserdata obj)
 {
     m_Script = script;
     object value = obj.Value;
     System.Collections.IEnumerable ienumerable = value as System.Collections.IEnumerable;
     if (ienumerable == null) throw new ExecutionException(m_Script, "pairs 只支持继承 IEnumerable 的类");
     m_Enumerator = ienumerable.GetEnumerator();
 }