Automapper将父实体嵌套在子实体中

Question

我在映射相互引用的嵌套类时遇到问题。实体框架在循环中存在嵌套实体，因此我最终在映射后嵌套在嵌套子实体中。

我做了一个示例程序，你可以复制粘贴，显示问题。在我的实际程序中，我正在映射集合，因此需要循环遍历整个集合以将所有嵌套对象设置为null并且感觉不整洁，我宁愿调整我的映射规则（如果可能）。

以下是显示问题的代码：

using AutoMapper;

public class Job
{
    public string Name { get; set; }
    public PayPackage PayPackage { get; set; }
}

public class PayPackage
{
    public string Name { get; set; }
    public Job Job { get; set; }
}

public class JobViewModel
{
    public string Name { get; set; }
    public PayPackageViewModel PayPackage { get; set; }
}

public class PayPackageViewModel
{
    public string Name { get; set; }
    public JobViewModel Job { get; set; }
}
class Program
{
    static void Main(string[] args)
    {
        var job = new Job
        {
            Name = "Job Name",
            PayPackage = new PayPackage
            {
                Name = "Pay Package Name"
            }
        };

        job.PayPackage.Job = job; //simulate how EF is populating entity

        var config = new MapperConfiguration(c =>
        {
            c.CreateMap<Job, JobViewModel>();
            c.CreateMap<JobViewModel, Job>();
            c.CreateMap<PayPackage, PayPackageViewModel>();
            c.CreateMap<PayPackageViewModel, PayPackage>();
        });

        var mapper = config.CreateMapper();

        var jobVm = mapper.Map<JobViewModel>(job);

        Assert.IsTrue(jobVm.PayPackage != null);
        Assert.IsTrue(jobVm.PayPackage.Job == null); //how do I specify mapping so this passes?

    }
}

避免父对象在映射结果中出现两次的最佳方法是什么？

Answer 1

EG

c.CreateMap<Job, JobViewModel>()
 .ForMember(dest => dest.PayPackage, opt => opt.Ignore());

映射发生时，将忽略目标PayPackage对象的JobViewModel属性。