关于前端:分层架构DTO和AutoMapper

AutoMapper

这些DTO须要和BLL里的entity进行映射。为了防止大量的手写代码，咱们能够引入：

通过 nuget 增加援用AutoMapper（演示：略）

MapperConfiguration：映射的配置
IMapper：执行映射，依附办法：Map()

在SRV的基类 BaseService 中引入动态构造函数，生成MapperConfiguration

    protected static MapperConfiguration autoMapperConfig;    static BaseService()    {        autoMapperConfig = new MapperConfiguration(cfg =>        {            cfg.CreateMap<Suggest, DTOSuggest>();        });

if DEBUG //温习：这是什么？

        autoMapperConfig.AssertConfigurationIsValid();

endif

    }因为MapConfiguration的生成是比拟消耗资源的，所以让其只在启动时生成一次（了解：为什么这样就能实现？）

而后，在 BaseService 中引入一个 mapper 属性，供所有子类应用：

    protected IMapper mapper    {        get        {            return autoMapperConfig.CreateMapper();        }    }mapper是“轻量级”的，个别不须要特地解决。（预计AutoMapper外部也进行了相应的解决，不是每次CreateMapper()就真的new一个）

最初，在SRV的子类中就能够调用：

        return mapper.Map<Suggest, DTOSuggest>(suggest);

//或者

        return mapper.Map<DTOSuggest, Suggest>(dtoSuggest);

//再或者：更新本人

        mapper.Map<DTOSuggest, Suggest>(dtoSuggest, suggest);

AutoMapper能够主动的映射名称雷同的属性。如果名称不同，须要进行配置：

            cfg.CreateMap<Suggest, DTOSuggest>()                .ForMember(s => s.Title, opt => opt.MapFrom(d => d.Subject))            ;

还能够配置疏忽某个属性：

                .ForMember(s => s.Title, opt => opt.Ignore())以及，如果某个属性为null值时的解决计划（AutoMapper不会报NullReferenceException）                .ForMember(s => s.Age, opt => opt.NullSubstitute(-1))AutoMapper还能够主动映射整个汇合。

更多的个性，留待同学们本人去挖掘……o(￣︶￣)o

简单类型属性
包含汇合元素

映射和逻辑
因为MapFrom()提供了弱小的，纳闷与哪些逻辑写在MapFrom()，哪些写在Service办法中？

一般来说，AutoMapper中只须要执行一些简略的“映射”逻辑

名称不同：Entity中应用
Null值替换
多对多
不应该通过MapFrom()实现：

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