constructor - Automapper - 如何映射到构造函数参数而不是属性 setter

Question

如果我的目标 setter 是私有(private)的，我可能想使用目标对象的构造函数映射到该对象。您将如何使用 Automapper 来做到这一点？

Answer 1

使用ConstructUsing

这将允许您指定在映射期间使用哪个构造函数。但随后所有其他属性将根据约定自动映射。

另请注意，这与 ConvertUsing 不同，convert using 不会继续通过约定进行映射，而是让您完全控制映射。

Mapper.CreateMap<ObjectFrom, ObjectTo>()
    .ConstructUsing(x => new ObjectTo(arg0, arg1, etc));

...

using AutoMapper;
using NUnit.Framework;

namespace UnitTests
{
    [TestFixture]
    public class Tester
    {
        [Test]
        public void Test_ConstructUsing()
        {
            Mapper.CreateMap<ObjectFrom, ObjectTo>()
                .ConstructUsing(x => new ObjectTo(x.Name));

            var from = new ObjectFrom { Name = "Jon", Age = 25 };

            ObjectTo to = Mapper.Map<ObjectFrom, ObjectTo>(from);

            Assert.That(to.Name, Is.EqualTo(from.Name));
            Assert.That(to.Age, Is.EqualTo(from.Age));
        }
    }

    public class ObjectFrom
    {
        public string Name { get; set; }
        public int Age { get; set; }
    }

    public class ObjectTo
    {
        private readonly string _name;

        public ObjectTo(string name)
        {
            _name = name;
        }

        public string Name
        {
            get { return _name; }
        }

        public int Age { get; set; }
    }
}