层次结构 - 基类抽象 - 向上下文添加新的派生类型 - OnSaveChanges给出错误[已添加具有相同键的项目] [英] Hierarchy - base class abstract - add new derived type to context - OnSaveChanges gives error [An item with the same key has already been added]

问题描述

 

 

    public abstract class DocumentLink
    {
        public virtual int DocumentLinkID
        {
            get;
            set;
        }
 
        public virtual int ModelID
        {
            get;
            set;
        }
    }

 

 

 

public class TaskCommunicationDocumentLink : Document.DocumentLink
    {
        public virtual int? StatusID
        {
            get;
            set;
        }
    }

 

  ;

模型构建器定义

 

            modelBuilder.Entity<Document.DocumentLink>().MapHierarchy
                (p => new
                {
                    DocumentLinkID = p.DocumentLinkID,
                    
                    ModelID = p.ModelID
                    
                }
                ).ToTable("Document.DocumentLink");
 
            modelBuilder.Entity<Task.TaskCommunicationDocumentLink>().MapHierarchy
                (p => new
                {
                    DocumentLinkID = p.DocumentLinkID,
                    StatusID = p.StatusID
                }
                ).ToTable("Task.TaskComunicationDocumentLink");

 

 

 

                    Model.Task.TaskCommunicationDocumentLink tdl = new Model.Task.TaskCommunicationDocumentLink();
                    tdl.CreatedByContactID = 1;
                    tdl.UpdatedByContactID = 1;
                    tdl.DateCreated = DateTime.Now;
                    tdl.DateUpdated = DateTime.Now;
                    tdl.ModelFullName = "aaa";
                    tdl.ModelID = 1;
                    tdl.StatusID = 111;
 
                    context.DocumentLinks.Add(tdl);
 
                    context.SaveChanges();

 

 

给出错误

在多个位置生成跨实体或关联共享的值。检查映射是否将EntityKey拆分为多个商店生成的列。

A value shared across entities or associations is generated in more than one location. Check that mapping does not split an EntityKey to multiple store-generated columns.

{"已添加具有相同密钥的项目。"}

{"An item with the same key has already been added."}

 

一旦我删除了DocumentLink的摘要，它就不会再给我错误并保存记录。

As soon as i remove abstract for DocumentLink it does not give me the error any more and save the record.

以下代码有效..

 

 

    public class DocumentLink
    {
        public virtual int DocumentLinkID
        {
            get;
            set;
        }
 
        public virtual int ModelID
        {
            get;
            set;
        }
    }

 

 

 

 

问题：

我仍然希望将DocumentLink作为抽象类。

I still want to have DocumentLink as an abstract class.

 

 

 

 

推荐答案

感谢您找到这个，这是CTP4中的一个错误，我们将制作确定它得到修复。目前看起来唯一可行的解​​决方法是从DocumentLink中删除摘要。

Thank you for finding this, it is a bug in CTP4 and we will make sure it gets fixed. For the moment it looks like the only feasible workaround is to remove abstract from DocumentLink.

~Rowan

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