/// <summary>
 /// 获取转换器
 /// </summary>
 /// <typeparam name="T"> 转换服务类型 </typeparam>
 /// <param name="container"> 服务容器 </param>
 /// <returns> </returns>
 /// <exception cref="OverflowException"> 字典中已包含元素的最大数目 (<see cref="F:System.Int32.MaxValue" />)。 </exception>
 public static IConvertor <T> GetConvertor <T>(this ConvertorServices container)
 {
     if (ReferenceEquals(ConvertorServices.Container, container))
     {
         return((IConvertor <T>)(Cache <T> .Service ?? (Cache <T> .Service = container.GetServiceItem(typeof(T))))?.Value);
     }
     return((IConvertor <T>)container.GetServiceItem(typeof(T))?.Value);
 }
 /// <summary>
 /// 获取转换器
 /// </summary>
 /// <param name="container"> 服务容器 </param>
 /// <param name="type"> 转换服务类型 </param>
 /// <returns> </returns>
 /// <exception cref="OverflowException"> 字典中已包含元素的最大数目 (<see cref="F:System.Int32.MaxValue" />)。 </exception>
 public static IConvertor GetConvertor(this ConvertorServices container, Type type)
 => (IConvertor)container.GetService(type);