.NET Framework 4上的EF5 - 存储库工作单元插入或更新子实体

Question

使用工作单元，存储库模式更新子实体的正确方法是什么？

修改

尝试1 - 仅更新父

   var existing = Find(Entry.ENTRYID);
   this.UnitOfWork.Context.Entry(existing).CurrentValues.SetValues(Entry);

尝试2 - 错误 - ObjectStateManager中已存在具有相同键的对象。 ObjectStateManager无法使用相同的键跟踪多个对象。

   this.UnitOfWork.Context.Entry(Entry).State = EntityState.Modified;

尝试3 - 工作但很难看。还有其他/更好的方法吗？

var existing = Find(Entry.ENTRYID);

// update parent Entry
this.UnitOfWork.Context.Entry(existing).CurrentValues.SetValues(Entry);

foreach (var existingProject in existing.Projects)
{                    
    var newProject = Entry.Projects.SingleOrDefault(p => p.DATE_WORKED == existingProject.DATE_WORKED);

    if (newProject != null)
    {
       existingProject.HOURS = newProject.HOURS;
       //... continue updating other properties
    }
}

工作单元

    public class EFUnitOfWork : IUnitOfWork
    {
        public DbContext Context { get; set; }

        public EFUnitOfWork()
        {
            Context = new MyEntities();
        }

        public void Commit()
        {
            Context.SaveChanges();
        }
    }

存储库

        public class EFRepository<T> : IRepository<T> where T : class
            {
                public IUnitOfWork UnitOfWork { get; set; }

                private IDbSet<T> _objectset;
                private IDbSet<T> ObjectSet
                {
                    get
                    {
                        if (_objectset == null)
                        {
                            _objectset = UnitOfWork.Context.Set<T>();
                        }
                        return _objectset;
                    }
                }

            }


            public interface IEntryEntityRepository : IRepository<EntryEntity>
            {
                void SubmitChanges();
                void InsertOrUpdate(EntryEntity Entry);
            }


        public class EntryEntityRepository : EFRepository<EntryEntity>, IEntryEntityRepository
            {


                public void SubmitChanges()
                {
                    this.UnitOfWork.Commit();
                }

                public void InsertOrUpdate(EntryEntity Entry)
                {   
                    if (Entry.ENTRYID == default(int))
                    {
                        // New entity
                        this.Add(Entry);               
                    }
                    else
                    {                
                        // Existing entity                 
                        var existing = Find(Entry.ENTRYID);

                        // WORKS - updates parent Entry
    this.UnitOfWork.Context.Entry(existing).CurrentValues.SetValues(Entry);

// HOW DO I UPDATE CHILD ENTITY Projects?


                        foreach (var existingProject in existing.Projects)
                        {                    
                            var newProject = Entry.Projects.SingleOrDefault(p => p.DATE_WORKED == existingProject.DATE_WORKED);

                            if (newProject != null)
                            {

                   WORKS -->             //existingProject.HOURS = newProject.HOURS;
                                 DOESN'T --> WORK //this.UnitOfWork.Context.Entry(existingTimeEntry).CurrentValues.SetValues(newTimeEntry);
                            }
                        }
                    }
                }

            }

实体

            public partial class EntryEntity
            {
                public EntryEntity()
                {
                    this.Projects = new HashSet<ProjectEntity>();
                }

                public int ENTRYID { get; set; }
                public virtual ICollection<ProjectEntity> Projects { get; set; }

            }

            public partial class ProjectEntity
            {
                public int OBJECTID { get; set; }
                public int ENTRYID { get; set; }
                public System.DateTime DATE_WORKED { get; set; }
                public double HOURS { get; set; }    
                public virtual EntryEntity Entry { get; set; }
            }