自動映射器投影不包括深度嵌套的層次對象

Question

我正在嘗試使用AutoMapper v6.1.1來使用投影映射類，但是AutoMapper不包含深層嵌套的對象。

我在此處附加了完整的Visual Studio 2015解決方案和單元測試： https : //www.dropbox.com/s/omue5ou5dvxsa57/UnitTestProject2.zip?dl=0

基本上，我試圖將映射Child和Parent層次到Person的層次結構，但grand- Parents沒有得到包含在投影的結果。

楷模：

public class Child
{
    public string Name { get; set; }

    public virtual Parent Parent { get; set; }
}

public class Parent
{
    public string Name { get; set; }

    public virtual Parent GrandParent { get; set; }
}

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

    public virtual Person Parent { get; set; }
}

映射配置文件：

public class PersonProfile : Profile
{
    public PersonProfile()
    {
        this.CreateMap<Child, Person>()
            .MaxDepth(5);
        this.CreateMap<Parent, Person>()
            .ForMember(destinationMember => destinationMember.Parent, memberOptions => memberOptions.MapFrom(sourceMember => sourceMember.GrandParent))
            .MaxDepth(5);
    }
}

單元測試：

[TestClass]
public class UnitTest1
{
    IMapper mapper;
    List<Child> children;

    [TestInitialize]
    public void TestInitialize()
    {
        MapperConfiguration configuration = new MapperConfiguration((config =>
        {
            config.AddProfile(new PersonProfile());
            config.ForAllMaps((mapType, mapperExpression) =>
            {
                mapperExpression.MaxDepth(5);
            });
        }));

        this.mapper = configuration.CreateMapper();

        mapper.ConfigurationProvider.AssertConfigurationIsValid();

        this.children = new List<Child>
        {
            new Child
            {
                Name = "Child1",
                Parent = new Parent
                {
                    Name = "Parent1",
                    GrandParent = new Parent
                    {
                        Name = "GrandParent1",
                        GrandParent = new Parent
                        {
                            Name = "GreatGrandParent1"
                        }
                    }
                }
            }
        };
    }

    [TestMethod]
    public void TestProjection()
    {
        IQueryable<Person> people = children.AsQueryable().ProjectTo<Person>(mapper.ConfigurationProvider);

        AssertPeople(people);
    }

    [TestMethod]
    public void TestMap()
    {
        List<Person> people = mapper.Map<List<Child>, List<Person>>(children);

        AssertPeople(people.AsQueryable());
    }

    private void AssertPeople(IQueryable<Person> people)
    {
        Assert.IsNotNull(people);
        Assert.AreEqual(1, people.Count());

        Person child1 = people.ElementAt(0);
        Assert.AreEqual("Child1", child1.Name);

        Person parent1 = child1.Parent;
        Assert.IsNotNull(parent1);
        Assert.AreEqual("Parent1", parent1.Name);

        Person grandParent1 = parent1.Parent;
        Assert.IsNotNull(grandParent1); // fails when using ProjectTo
        Assert.AreEqual("GrandParent1", grandParent1.Name);
    }
}

使用Map方法有效，但ProjectTo無效。

示例代碼中的類比生產中使用的類簡單得多。

我試圖用投影，這樣我可以返回一個IQueryable<Person>從OData的，走的優勢SQL所產生的LINQ to Entities自動應用的查詢選項。

任何幫助表示贊賞。

謝謝！

Answer 1

我認為這可以描述問題： https : //github.com/AutoMapper/AutoMapper/issues/2171

但是，作為一種解決方法，不可能創建一個在內部基本上調用Map的擴展方法：

public static class Extenstions
{
    public static IQueryable<TDestination> ProjectToExt<TDestination, TSource>(this IQueryable<TSource> @this,
        IMapper mapper)
    {
        return mapper.Map<IEnumerable<TDestination>>(@this).AsQueryable();
    }
}

那么調用代碼就像：

IQueryable<Person> people = children.AsQueryable().ProjectToExt<Person, Child>(mapper);