自动映射器:部分映射 [英] Automapper : partial mapping

问题描述

我正在使用Automapper将数据从objectA传输到objectB

I am using Automapper to transfer data from objectA to objectB

classe ObjectA
{
   string Title;
   string Summary;
}

classe ObjectB
{
   string Title;
   string Summary;
   IAddress Address;
}

我在两个对象之间创建了这种映射

I created this kind of mapping between the two objects

AutoMapper.Mapper.CreateMap<IObectA, IObjectB>()
      .ForMember(dest => dest.Title,           src => src.MapFrom(s => s.Title))
      .ForMember(dest => dest.Summary,         src => src.MapFrom(s => s.Summary))
      .ForMember(dest => dest.Address,         src => src.Ignore())

我创建我的ObjectB并填充其所有属性，包括地址

I create my ObjectB and fill all its properties including Address

当我调用映射器时，我期望它会覆盖标题"和摘要"，而忽略地址"

When I call the mapper, I was expecting it to override Title and Summary and ignore Address

ObjectB = Mapper.Map<IObjectA, IObjectB>(objectA); 

实际上，它是对Address的抛出和异常.

Actually, it is throwing and exception for Address.

我做错了什么?

[UPDATE] 为了表达不同，我有我的objectB，我想用来自ObjectA的数据更新它的一部分.当我说忽略"时，我的意思是将数据保留为原来的状态

[UPDATE] To express it differently, I have my objectB and I want to update part of it with data coming from ObjectA. When I say Ignore, I mean leave the data the way they already are

推荐答案

我找到了解决方案.

我刚刚发现Map方法具有一个重载版本，除了预先实例化的目标对象外. 感谢此文章

I just discovered that Map method has an overloaded version that excepts a pre-instantiated destination object. Thanks to this article

Mapper.Map<IObjectA, IObjectB>(objectA, ObjectB ); 

@JoDG ，谢谢您的帮助

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