AutoMapper 和 "UseDestinationValue"

Question

UseDestinationValue 有什么作用？

我问是因为我有一个基类和继承类，对于基类，我希望 AutoMapper 为我获取现有值。

它会这样做吗？ (我已经看过了，我能看到的关于 UseDestinationValue 的唯一示例涉及列表。它仅用于列表吗？

我可以这样做吗:

PersonContract personContract = new PersonContract {Name = 'Dan'};
Person person = new Person {Name = "Bob"};
Mapper.CreateMap<PersonContract, Person>()
      .ForMember(x=>x.Name, opt=>opt.UseDestinationValue());

person = Mapper.Map<PersonContract, Person>(personContract);

Console.WriteLine(person.Name);

并且输出是鲍勃？

Answer 1

我把整个问题都写了下来，然后想，呃!运行它看看。

它像我希望的那样工作。

这是我最终得到的代码:

class Program
{
    static void Main(string[] args)
    {
        PersonContract personContract = new PersonContract {NickName = "Dan"};
        Person person = new Person {Name = "Robert", NickName = "Bob"};
        Mapper.CreateMap<PersonContract, Person>()
            .ForMember(x => x.Name, opt =>
                                        {
                                            opt.UseDestinationValue();
                                            opt.Ignore();
                                        });

        Mapper.AssertConfigurationIsValid();

        var personOut = 
            Mapper.Map<PersonContract, Person>(personContract, person);

        Console.WriteLine(person.Name);
        Console.WriteLine(person.NickName);

        Console.WriteLine(personOut.Name);
        Console.WriteLine(personOut.NickName);
        Console.ReadLine();
    }
}

internal class Person
{
    public string Name { get; set; }
    public string NickName { get; set; }
}

internal class PersonContract
{
    public string NickName { get; set; }
}

输出是:

Robert
Dan
Robert
Dan