截取一些核心代码如上,在第五行的代码中,会将这个entity状态从detach状态变为add状态,也就是将StateManager的五个reference map进行处理,并且触发了这个entity的StateChanging方法,然后在26行代码中如果这个entity的old状态是detach,则需要StateManager去开始追踪他 StateManager.StartTracking(this);,追踪的概念是为这个实体...
例如:在更新中使用 public int Updata(T entity,params string[] propNames) { var oldEntity = DB.Entry(entity); oldEntity.State = EntityState.Unchanged; foreach (var prop in propNames) { oldEntity.Property(prop).IsModified = true; } return DB.SaveChanges(); } 转载于:https://www.cnblogs....
EF CORE 的tracked问题在Entity Framework Core中，即使在查询时使用了AsNoTracking()方法来禁用追踪功能，...
تلميح It is not necessary to clear the change tracker or explicitly detach entity instances when taking this approach. However, if you do need to detach entities, then calling ChangeTracker.Clear is more efficient than detaching entities one-by-one....
EFCore中如何取消跟踪DbContext中所有被跟踪的实体 ⾸先定义⼀个DbContext的扩展类DbContextDetachAllExtension，其中包含⼀个DbContext的扩展⽅法DetachAll，⽤来取消跟踪DbContext 中所有被跟踪的实体：using Microsoft.EntityFrameworkCore;using System.Linq;namespace DbContextUtils { /// /// DbContext的扩...
Fresco源码分析 efcore源码分析 紧接着我的上一篇博客,可以点击这里回到上一篇博客,上回分析到ef 两个重要的对象,StateManager和ChangeTracker这个对象,当我们向DbContext添加对象的时候我们会调用如下代码。 1 private EntityEntry<TEntity> SetEntityState<TEntity>(...
ShardingCore ShardingCore 一款 ef-core 下高性能、轻量级针对分表分库读写分离的解决方案,具有零依赖、零学习成本、零业务代码入侵。Github Source Code… 阅读全文 EFCore 缓存问题? GLORY DOG 查询语句肯定要走数据库呀,并不是查询缓存,第一个是你修改了值存缓存了,状态Detach吧,重新查询的和缓存比较,缓存...
Upon saving, entities are being tracked. I want to detach them all. This worked in .NET Core 2.2 with EF2.2 It no longer works in .NET Core 3.0 with EF3.0. Steps to reproduce Have a simple model where a child entity has a non-nullable FK to the parent entity. The parent entity ha...
public interface IObjectSet<TEntity> : IQueryable<TEntity>, IEnumerable<TEntity>, IQueryable, IEnumerable where TEntity : class { void AddObject(TEntity entity); void Attach(TEntity entity); void DeleteObject(TEntity entity); void Detach(TEntity entity); } I...
问未保存的EF核心跟踪实体EN//---Over var Over = new Object(); Over.Init = function(e) { ...