Question

我尝试了很多选项让Automapper正确映射父/子关系。

型号：

//Entity
public class WorkArea
{
  public Guid Id;
  public Name {get;set;}
  public Guid? ParentWorkAreaId {get;set;} //for entity Framework Foreign Key 
  public WorkArea ParentWorkArea {get;set;}
  public ICollection<WorkArea> ChildWorkareas {get;set;}
}

//DTO
public class WorkAreaDto
{
  public Guid Id;
  public Name {get;set;}
  public Guid? ParentWorkAreaId {get;set;} //for entity Framework Foreign Key 
  public WorkAreaDto ParentWorkArea {get;set;}
  public ICollection<WorkAreaDto> ChildWorkareas {get;set;}
}

此映射导致堆栈溢出：

Mapper.CreateMap<WorkArea,WorkAreaDto>();

我尝试了与this完全相同的错误

然后我创建了一个自定义TypeConverter，但我不仅要为子节点编写递归方法，还要为父节点编写递归方法。看起来很多工作确实可以正确映射。不确定我是否做错了什么。我正在使用2.0

更新我认为我的问题是Entity Framework生成的System.Data.Entity.DynamicProxies。

Answer 1

这对我来说效果很好，也许你应该检查你的数据：

        [TestMethod]
        public void TestMethod1()
        {
            Mapper.CreateMap<WorkArea, WorkAreaDto>();

            var source = CreateSource();

            WorkAreaDto destination = new WorkAreaDto();
            Mapper.Map(source, destination);

            Assert.AreEqual(destination.ChildWorkareas.Count, 3);

        }

        private WorkArea CreateSource()
        {
            var id = Guid.NewGuid();

            var result = new WorkArea();
            result.Id = id;
            result.Name = "Name" + id.ToString();
            result.ParentWorkArea = CreateSourceParent(result);
            result.ParentWorkAreaId = result.ParentWorkArea.Id;
            result.ChildWorkareas = CreateSourceChildren(result);

            return result;
        }

        private ICollection<WorkArea> CreateSourceChildren(WorkArea parent)
        {
            var result = new Collection<WorkArea>
                {
                new WorkArea() { Id = Guid.NewGuid(), Name = "Child1", ParentWorkArea = parent, ParentWorkAreaId = parent.Id },
                new WorkArea() { Id = Guid.NewGuid(), Name = "Child2", ParentWorkArea = parent, ParentWorkAreaId = parent.Id },
                new WorkArea() { Id = Guid.NewGuid(), Name = "Child3", ParentWorkArea = parent, ParentWorkAreaId = parent.Id }
                };

            return result;
        }

        private WorkArea CreateSourceParent(WorkArea source)
        {
            var id = Guid.NewGuid();

            var result = new WorkArea();
            result.Id = id;
            result.Name = "Name" + id.ToString();
            result.ChildWorkareas = new Collection<WorkArea>
            {
                source
            };

            return result;

        }

实体框架生成DynamicProxies时，自动映射和映射父/子关系会导致StackOverflow错误？

1 个答案: