entity-framework - 如何删除孤立记录

Question

我正在尝试使用 GraphDiff 和 Entity Framework 来更新多个表中的一组记录。一切正常，除了我需要删除任何可能已被替换的拥有实体的孤立记录。我缺少什么，因为我期望这种行为很常见，我只需要弄清楚如何适本地配置上下文或图形。这是我的示例代码:

        using (EfDataContext ctx = new EfDataContext())
        {
            try
            {
                ctx.Database.Log = msg => _sysLogObject.Debug(msg);

                ctx.UpdateGraph(assay, map => map
                    .OwnedCollection(p => p.Imagings, with => with
                        .OwnedEntity(p => p.ImagingCellType))
                    .OwnedEntity(p => p.DisplayTemplate)
                    .OwnedEntity(p => p.ExportTemplate)
                    .OwnedEntity(p => p.PrintTemplate)
                );
                ctx.SaveChanges();
                success = true;
            }
            catch (Exception ex)
            {
                _sysLogObject.Error(ex);
                throw;
            }
        }

Answer 1

免责声明:我是该项目的所有者 Entity Framework GraphDiff

我们也通过电子邮件收到了同样的问题。答案是:

The child must have a navigation property toward the parent to make it work. Otherwise, the entity is just skipped by the ChangeTracker from Entity Framework.