Automapper not mapping a computed property

Question

I have a simple interface like:

interface IEntity
{
    int EntityID { get; }
}

and a number of classes implementing using a computed property for the EntityID , like so:

class Person : IEntity
{
    public int PersonID { get; set; }
    public int EntityID => PersonID;
}

I'm trying to map to another class with the same property, like the one below, using Automapper:

class Result
{
    public int EntityID { get; }
}

I can't get it to map the property though. The test below fails because the EntityID in the result is always 0 , even when I explicitly set the ForMember() mapping, like below:

using AutoMapper;
using Xunit;

public class UnitTest1
{       
    [Fact]
    public void Test1()
    {
        var mapper = new MapperConfiguration(cfg => cfg.CreateMap<IEntity, Result>()
        .ForMember(dest => dest.EntityID, i => i.MapFrom(src => src.EntityID)))
            .CreateMapper();

        var result = mapper.Map<Result>(new Person() { PersonID = 5 });
        Assert.Equal(5, result.EntityID);
    }
}

There has got to be some obvious solution I'm missing here. Any help would be appreciated.

Answer 1

对于简单的属性，AM 需要一个 setter 来工作，就像手动方法一样。