AutoMapper可从多个来源转换 [英] AutoMapper convert from multiple sources

问题描述

假设我有两个模型类:

public class People {
   public string FirstName {get;set;}
   public string LastName {get;set;}
}

还有一门电话:

public class Phone {
   public string Number {get;set;}
}

我想这样转换为PeoplePhoneD:

And I want to convert to a PeoplePhoneDto like this:

public class PeoplePhoneDto {
    public string FirstName {get;set;}
    public string LastName {get;set;}
    public string PhoneNumber {get;set;}
}

比方说，我在控制器中拥有:

Let's say in my controller I have:

var people = repository.GetPeople(1);
var phone = repository.GetPhone(4);

// normally, without automapper I would made
return new PeoplePhoneDto(people, phone) ;

在这种情况下，我似乎找不到任何示例.这可能吗?

I cannot seem to find any example for this scenario. Is this possible ?

注意:仅针对此问题的示例是不真实的.

Note: Example is not-real, just for this question.

推荐答案

您不能直接将多个源映射到单个目标-您应按照

You cannot directly map many sources to single destination - you should apply maps one by one, as described in Andrew Whitaker answer. So, you have to define all mappings:

Mapper.CreateMap<People, PeoplePhoneDto>();
Mapper.CreateMap<Phone, PeoplePhoneDto>()
        .ForMember(d => d.PhoneNumber, a => a.MapFrom(s => s.Number));

然后通过这些映射中的任何一个创建目标对象，并将其他映射应用于创建的对象.并且可以通过非常简单的扩展方法来简化此步骤:

Then create destination object by any of these mappings, and apply other mappings to created object. And this step can be simplified with very simple extension method:

public static TDestination Map<TSource, TDestination>(
    this TDestination destination, TSource source)
{
    return Mapper.Map(source, destination);
}

用法非常简单:

var dto = Mapper.Map<PeoplePhoneDto>(people)
                .Map(phone);

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