如何使用automapper映射复杂类型

Question

具有复杂嵌套映射的Automapper。我正在尝试映射mydestinationArrayField和dest1Array，这里是要复制到dest1Array的源对象列表。

这是我的source和destination类。

namespace AutomapperDemo
{
class Program
{
static void Main(string[] args)
{
try
{
SourceObject request = new SourceObject()
{
sourceTypeField = "1",
SourceObj1Field = new SourceObj1
{
SourceObj1Id = "1",
SourceObjListss = new List<SourceInnerObjList>
{
new SourceInnerObjList
{
SourceObjListItem1Id = 1

},
new SourceInnerObjList
{
SourceObjListItem1Id = 2
}
}
}
};
var mapper = CreateMapper();
DestinationObject destination = new DestinationObject();
destination = mapper.Map<DestinationObject>(request);
}
catch (Exception ex)
{
throw ex;
}
}
public static IMapper CreateMapper()
{
var config = new MapperConfiguration(cfg =>
{
cfg.AllowNullDestinationValues = true;
cfg.CreateMap<SourceObject, DestinationObject>()
.ForMember(dest => dest.destinationTypeField, o => o.MapFrom(src => src.sourceTypeField))
.ForMember(dest => dest.destinationObjectArrayField, o => o.MapFrom(src => new destinationObjectArray()
{
mydestinationArrayField = src.SourceObj1Field.SourceObjListss.Select(x => x.SourceObjListItem1Id).FirstOrDefault().ToString(), //this gives error
//dest1Array = src.SourceObj1Field.SourceObjListss // here source objectlist to be copied to dest1array
}));
});
return config.CreateMapper();
}
}
}

namespace Automapper
{
public class SourceObject
{
public string sourceTypeField;
public SourceObj1 SourceObj1Field { get; set; }
}
public class SourceObj1
{
public string SourceObj1Id { get; set; }
public ICollection<SourceInnerObjList> SourceObjListss { get; set; }
}
public class SourceInnerObjList
{
public int SourceObjListItem1Id { get; set; }
public int SourceObjListItem2d { get; set; }
}
public class SourceInnerObj2List
{
public int? mycount { get; set; }
public int? yourcount { get; set; }
}
}

namespace Automapper
{
public class DestinationObject
{
public string destinationTypeField;
public destinationObjectArray[] destinationObjectArrayField;
}
public class destinationObjectArray
{
public string mydestinationArrayField;
public string myField1;
public destinationInnerObject1Array[] dest1Array;
public destinationInnerObject2Array[] dest2Array;
}
public class destinationInnerObject1Array
{
public string destinationInnerObjectItem11;
public string destinationInnerObjectItem21;
}
public class destinationInnerObject2Array
{
public string categoryTypeField;
public string valueField;
public string NumberField;
}
}

在执行映射时；缺少类型映射配置或不支持的映射">

无论我如何配置忽略或自定义映射，它似乎都不喜欢这种嵌套。任何一位Automapper专家都可以告诉我如何对这样的复杂对象进行映射。

Answer 1

您的第二个ForMember似乎不起作用：

.ForMember(dest => dest.destinationObjectArrayField, o => o.MapFrom(src => new destinationObjectArray() //...

因为在中，您正在定义映射以返回destinationObjectArray((而不是destinationObjectArray[]！

因此，有一个类似的地图：

destinationObjectArrayField->destinationObjectArray((

并且没有类似的映射：

destinationObjectArrayField->destinationObjectArray[]

而Automapper正告诉你这一点。

你应该这样做：

cfg.CreateMap<SourceObject, DestinationObject>()
.ForMember(dest => dest.destinationTypeField, o => o.MapFrom(src => src.sourceTypeField))
.ForMember(dest => dest.destinationObjectArrayField,
o => o.MapFrom(
src => src.SourceObj1Field
.SourceObjListss
.Select(x => new destinationObjectArray
{
myField1 = $"first_id: {x.SourceObjListItem2d} second_id: {x.SourceObjListItem1Id}"
})
.ToArray()
));
});

此外，强烈建议清理和格式化代码，看起来你只是迷失在其中了！IDE可以帮助实现这一点。