Question

在基类中定义的属性中使用ExplicitExpansion时，AutoMapper不会在EF中投影查询。以下代码显示了模型：

/*********** Source Types ***********/
class EntityBase
{
    public Guid? CreatedById { get; set; }
    public Guid? ModifiedById { get; set; }
    [ForeignKey("CreatedById")]
    public User CreatedBy { get; set; }
    [ForeignKey("ModifiedById")]
    public User ModifiedBy { get; set; }
}

class User
{
    [Key]
    public Guid Id { get; set; }
    public string Name { get; set; }
}

class Script : EntityBase
{
    [Key]
    public Guid Id { get; set; }
    public string Text { get; set; }
}


/*********** Destination Types ***********/
class EntityBaseModel
{
    public Guid? CreatedById { get; set; }
    public Guid? ModifiedById { get; set; }
    public UserModel CreatedBy { get; set; }
    public UserModel ModifiedBy { get; set; }
}

class UserModel
{
    public Guid Id { get; set; }
    public string Name { get; set; }
}

class ScriptModel : EntityBaseModel
{
    public Guid Id { get; set; }
    public string Text { get; set; }
    public new UserModel ModifiedBy { get; set; } //notice the 'new' here? this will work
}

我正在使用以下映射配置：

 Mapper.Initialize(cfg =>
        {
            cfg.CreateMap<Script, ScriptModel>()
            .MaxDepth(1)
            .ForMember(d => d.ModifiedBy, o => o.ExplicitExpansion())
            .ForMember(d => d.CreatedBy, o => o.ExplicitExpansion());
        });

以下测试将失败，但它不应该...它应该获取CreatedBy属性，因为我已明确说过：

/// <summary>
    /// This will fail, but it shouldn't.
    /// </summary>
    [TestMethod]
    public void Should_Map_CreatedBy()
    {
        using (var context = new MyContext())
        {
            var model = context.Scripts.Include("CreatedBy").ProjectTo<ScriptModel>(null, "CreatedBy").FirstOrDefault();
            Assert.IsNotNull(model);
            Assert.IsNotNull(model.CreatedBy);
        }
    }

我也尝试过这些配置，但它不起作用

Mapper.Initialize(cfg =>
        {
            cfg.CreateMap<EntityBase, EntityBaseModel>();
            cfg.CreateMap<User, UserModel>();
            cfg.CreateMap<Script, ScriptModel>()
            .MaxDepth(1)
            .ForMember(d => d.ModifiedBy, o => o.ExplicitExpansion())
            .ForMember(d => d.CreatedBy, o => o.ExplicitExpansion());
        });
Mapper.Initialize(cfg =>
        {
            cfg.CreateMap<EntityBase, EntityBaseModel>();
            cfg.CreateMap<User, UserModel>();
            cfg.CreateMap<Script, ScriptModel>()
            .IncludeBase<EntityBase, EntityBaseModel>()
            .MaxDepth(1)
            .ForMember(d => d.ModifiedBy, o => o.ExplicitExpansion())
            .ForMember(d => d.CreatedBy, o => o.ExplicitExpansion());
        });

我的映射配置有问题吗？这是一个自动播放器错误吗？

以下是完整的复制品：https://1drv.ms/u/s!AhH0QYI81F61gtIx0q27BZ05EM-xQA

Answer 1

    cfg.CreateMap<User, UserModel>();
    cfg.CreateMap<Script, ScriptModel>()
        .ForMember(d => d.ModifiedBy, o => o.ExplicitExpansion())
        .ForMember(d => d.CreatedBy, o => o.ExplicitExpansion());

    var model = context.Scripts.ProjectTo<ScriptModel>(s=>s.CreatedBy).FirstOrDefault()

这对我来说最新版本。

使用ExplicitExpansion从基类映射属性不起作用

1 个答案: