/// <summary>
     /// 获取一个类指定的属性值
      /// </summary>
      /// <param name="info">object对象</param>
      /// <param name="field">属性名称</param>
      /// <returns></returns>
        public static object GetPropertyValue(object info, string field)
        {
            if (info == null) return null;
            Type t = info.GetType();
            IEnumerable<System.Reflection.PropertyInfo> property = from pi in t.GetProperties() where pi.Name.ToLower() == field.ToLower() select pi;
            return property.First().GetValue(info, null);
        }