/// <summary> /// 转换功能(可转空类型) /// </summary> /// <param name="value">需转换的对象</param> /// <param name="convertsionType">转换的类型</param> /// <exception cref="InvalidCastException">转换时类型有误</exception>
/// <summary> /// 转换功能(可转空类型) /// </summary> /// <param name="value">需转换的对象</param> /// <param name="convertsionType">转换的类型</param> /// <exception cref="InvalidCastException">转换时类型有误</exception>