/// <summary>
 /// 获取propertyName指定的属性值
 /// </summary>
 /// <param name="propertyName">属性名称</param>
 /// <param name="defaultValue">如果未找到则返回该默认值</param>
 public T GetExtendedProperty <T>(string propertyName, T defaultValue)
 {
     return(PropertySerializer.GetExtendedProperty <T>(propertyName, defaultValue));
 }
 /// <summary>
 /// 获取propertyName指定的属性值
 /// </summary>
 /// <param name="propertyName">属性名称</param>
 public T GetExtendedProperty <T>(string propertyName)
 {
     return(PropertySerializer.GetExtendedProperty <T>(propertyName));
 }