ASP.NET CORE 3.1 WebApi 引用AutoMapper

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本文介绍了如何在C#项目中使用AutoMapper库进行实体与视图实体之间的映射配置。首先，通过NuGet添加了AutoMapper和其依赖注入扩展包。接着，创建了`Demo`实体和`DemoViewModel`视图实体，并定义了它们之间的映射关系。然后，自定义了`CustomProfile`配置类和`AutoMapperConfig`静态类来注册映射。最后，在服务层中展示了如何利用DI容器获取`IMapper`实例并进行映射操作。

一、添加引用包

  <PackageReference Include="AutoMapper" Version="10.1.1" />
  <PackageReference Include="AutoMapper.Extensions.Microsoft.DependencyInjection" Version="8.1.1" />

二、创建实体和视图实体

public class DemoViewModel
{
    public string DemoName { get; set; }
}

public class Demo
{
    public int Id { get; set; }
    public string Name { get; set; }
}

三、映射关系配置

public class CustomProfile:Profile
{
    /// <summary>
    /// 配置构造函数，用来创建关系映射
    /// </summary>
    public CustomProfile()
    {
        CreateMap<Demo, DemoViewModel>().ForMember(d=>d.DemoName,o=>o.MapFrom(s=>s.Name));
        CreateMap<DemoViewModel, Demo>().ForMember(d=>d.Name,o=>o.MapFrom(s=>s.DemoName));
    }
}

public static class AutoMapperSetup
{
     public static void AddAutoMapperSetup(this IServiceCollection services)
     {
         if (services == null) throw new ArgumentNullException(nameof(services));

         services.AddAutoMapper(typeof(AutoMapperConfig));
         AutoMapperConfig.RegisterMappings();
     }
 }

public class AutoMapperConfig
{
     public static MapperConfiguration RegisterMappings()
     {
         return new MapperConfiguration(cfg =>
         {
             cfg.AddProfile(new CustomProfile());
         });
     }
 }

 #region AutoMapper
 services.AddAutoMapperSetup();
 #endregion

四、使用，在Serv层调用IMapper

public class DemoServ : IDemoServ
{
    private readonly IDemoRepo _demoRepo;
    private readonly IMapper _mapper;

    public DemoServ(IDemoRepo demoRepo,IMapper mapper)
    {
        _demoRepo = demoRepo;
        _mapper = mapper;
    }

    public DemoViewModel GetDemos()
    {
        return _mapper.Map<DemoViewModel>(_demoRepo.GetDemos());
    }
}