如何使用AfterMap映射集合属性的属性

Question

我有两个实体和两个DTO.我正在将实体映射到DTO.DTO的简化版本如下所示:

public class FooDto {
     // Other properties removed for clarity.
     public string Description { get; set; }
     public decimal Total { get; set; }
     public ICollection<BarDto> Bars { get; set; }
}

public class BarDto {
     // Other properties removed for clarity.
     public decimal Total { get; set; }
}

这些Foo和Bar类是:

public class Foo {

     public ICollection<Bar> Bars { get; set; }
}

public class Bar {
    // Unimportant properties
}

映射

我在一个方法中将其映射为:

public FooDto Map(IMapper mapper, Foo foo) {

        // _fooTotalService and _barTotalService injected elsewhere by DI.

        return mapper.Map<Foo, FooDto>(foo, opt =>
        {
            opt.AfterMap((src, dest) =>
            {
                dest.Total = _fooTotalService.GetTotal(src);
                dest.Bars.Total = ?????? // Needs to use _barTotalService.CalculateTotal(bar)
            });
        });
}

AutoMapper已经配置了Foo到FooDto和Bar到BarDto的映射,它们正常工作.

我需要使用服务更新FooDto中的每个BarDto(其原因太长而无法进入 - 足以说它需要以这种方式发生).

我需要使用什么语法AfterMap来映射使用该方法的每个Total属性,哪里有问题？ BarDto_barTotalService.CalculateTotal(bar)barBar

请注意,该_barTotalService.CalculateTotal方法采用的是Barnot 的实例BarDto.

Answer 1

这应该工作 -

 AutoMapper.Mapper.CreateMap<Foo, FooDto>()
            .AfterMap((src, dest) =>
            {
                dest.Total = 8;//service call here
                for (var i = 0; i < dest.Bars.Count; i++)
                {
                    dest.Bars.ElementAt(i).Total = 9;//service call with src.Bars.ElementAt(i)
                }
            });
AutoMapper.Mapper.CreateMap<Bar, BarDto>();
var t = AutoMapper.Mapper.Map<FooDto>(new Foo
        {
            Bars = new List<Bar> { new Bar { } }
        });