C# 使用 Automapper 进行深层映射
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Deep level mapping using Automapper
提问by SexyMF
I am trying to map objects with multi-level members: these are the classes:
我正在尝试使用多级成员映射对象：这些是类：
public class Father
{
public int Id { get; set; }
public Son Son { get; set; }
}
public class FatherModel
{
public int Id { get; set; }
public int SonId { get; set; }
}
public class Son
{
public int Id { get; set; }
}
This is how I try automap it:
这就是我尝试自动映射它的方式：
AutoMapper.Mapper.CreateMap<FatherModel , Father>()
.ForMember(dest => dest.Son.Id, opt => opt.MapFrom(src => src.SonId));
this is the exception that I get:
这是我得到的例外：
Expression 'dest => Convert(dest.Son.Id)' must resolve to top-level member and not any child object's properties. Use a custom resolver on the child type or the AfterMap option instead. Parameter name: lambdaExpression
表达式 'dest => Convert(dest.Son.Id)' 必须解析为顶级成员，而不是任何子对象的属性。改为在子类型或 AfterMap 选项上使用自定义解析器。参数名称：lambdaExpression
Thanks
谢谢
采纳答案by Allrameest
This will work both for mapping to a new or to an existing object.
这适用于映射到新对象或现有对象。
Mapper.CreateMap<FatherModel, Father>()
.ForMember(x => x.Son, opt => opt.MapFrom(model => model));
Mapper.CreateMap<FatherModel, Son>()
.ForMember(x => x.Id, opt => opt.MapFrom(model => model.SonId));
回答by Maxim
AutoMapper.Mapper.CreateMap<FatherModel, Father>()
.ForMember(x => x.Son, opt => opt.ResolveUsing(model => new Son() {Id = model.SonId}));
if it's getting more complex you can write a ValueResolver class, see example here- http://automapper.codeplex.com/wikipage?title=Custom%20Value%20Resolvers
如果它变得更复杂，您可以编写 ValueResolver 类，请参见此处的示例 - http://automapper.codeplex.com/wikipage?title=Custom%20Value%20Resolvers
回答by Teja Swaroop
Use ForPath rather than ForMember & It works like magic.
使用 ForPath 而不是 ForMember & 它像魔术一样工作。
