索引器基类定义

  public  class ClassIndex
    {
       
        public object this[string index]
        {
            get
            {
                object result = null;
                foreach (var item in this.GetType().GetProperties())
                {
                    if (index == item.Name)
                    {
                        result = item.GetValue(item);
                    }

                }
                return result;
            }
            set
            {
                foreach (var item in this.GetType().GetProperties())
                {
                    if (index == item.Name)
                    {
                        item.SetValue(this, value,null);
                        
                    }
                }

            }

        }
    }