另一方面， DbSet.Attach(entity) 将实体附加到上下文而不将其标记为脏。相当于做了context.Entry(entit...
除了（标记的答案）之外， context.Entry(entity).State = EntityState.Unchanged 和 context.Attach(...
A common pattern for some applications is to either Add an entity as new (resulting in a database insert) or Attach an entity as existing and mark it as modified (resulting in a database update) depending on the value of the primary key. For example, when using database gene...
When I attach the indicator to a chart it works as expected, but ...I need to restructure this class without the use of instance variables So I'm doing a TUI and this was my first iteration. My instructor wants me to do this without instance variables He said if a method needs the...
增加DbContext 对 DbSet 的快速代理方法(Add/Update/Remove/Attach); 增加DbContext 通用类,命名为:FreeContext,也可以通过 IFreeSql 扩展方法 CreateDbContext 创建; 增加ISelect NoTracking 扩展方法,查询数据时不追踪(从而提升查询性能); v0.4.5 增加DbSet Attach 方法附加实体,可用于不查询就更新或删除; v0.4...
在多线程中EF修改事件的解决方案,使用attach不可以: 使用Entry也报错 最终参考如下帖子 //////修改方法//////publicvoidUpdateAddress(Address addressValue) {using(OrderDBContainer context =newOrderDBContainer()) {//显示输入新数据的信息Display("Current", addressValue);...
related to the order from your last reply. I suggest you can try to place this.dbContext.Relaties.Attach(relatie) before you update relationship and try it again. Please check here for more information about Attaching Entities.http://msdn.microsoft.com/en-us/library/gg696174(v=VS.103).aspx...
(e.g. when you've used the Facebook API to post a status update on Facebook, you can't roll it back even if that operation was part of a wider user action that eventually failed as a whole). So in this application, a user action will often require us to execute multiple business...
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Some of the ObjectContext methods are also renamed. For example ObjectContext has methods like AddObject, DeleteObject And Attech on ObjectSet<T>, in DbContext, they are named Add, Remove and Attach on DbSet<TEntity>. Conclusion Dbcontext can be defined as a lightweight version of the Object...