共计 18197 个字符,预计需要花费 46 分钟才能阅读完成。
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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