当调用SaveChanges方法时,EntityFramework默认情况下总是先对所有已经变化的实体类中所有的属性值进行检测,如果你需要更新大批量的数据实体并且这些实体已经通过了验证,那么这一步显然多余,你可以通过暂时性地关闭验证机制使得保存数据的进度花费更少的时间(借助“”属性进行设置)。关于此更多的信息你可以参考EntityFramework...
If you've had many-to-many relationships when using the database-first strategy, you may be familiar with the fact that Entity Framework can create many-to-many mappings when the database join table contains only the primary keys of the related entities. This mapping rule is the same for ...
IRelatedEnd.Add 方法 Microsoft Learn Challenge Nov 23, 2024 – Jan 10, 2025 立即注册 消除警报 Learn 发现 产品文档 开发语言 主题 登录 此主题的部分內容可能由机器或 AI 翻译。 消除警报 版本 Entity Framework 6.2.0 EdmEnumTypeAttribute EdmFunctionAttribute...
Entity Framework Core 快速开始 https://docs.microsoft.com/zh-cn/ef/core/dbcontext-configuration/https://www.entityframeworktutorial.net/basics/how-entity-framework-works.aspx1.快速开始假如有以下的数据模型:分别创建实体如下:public class Student{ public int ID { get; set; } public strin. ef efco...
将实体添加到相关端。 此方法与 Add(object) 的工作方式完全相同。 保留此方法是为了与以前版本的 IRelatedEnd 向后兼容。命名空间: System.Data.Entity.Core.Objects.DataClasses 程序集: EntityFramework(在 EntityFramework.dll 中)语法VB 复制 声明<SuppressMessageAttribute("Microsoft.Design", "CA1033:...
Entity Framework, however, has its own way of determining the equality of tracked entities, and this relies on identity. If you’ve overwritten Equals (and the GetHashCode method that Equals is dependent upon), you can trip up the change-tracking behavior of Entity Framework. Petar Paar ...
Add, Remove and Attach are similar to AddObject, DeleteObject and Attach on ObjectSet<T>. We’ve renamed Add and Remove to keep DbSet<TEntity> consistent with other sets in the framework.Add and Attach can now be called on objects that are already tracked by the context, Add will ensure...
Before you can delete the customer or opportunity that has a related order or invoice record, you must delete the order or invoice first.As you model your business data by creating custom entities or when using existing Dynamics 365 Customer Engagement (on-premises) system entities, consider the...
EF Core 6.0 Release Candidate 1 was released to NuGet a few weeks ago. This release is the first of two “go live” release candidates that are supported in production. EF Core 6.0 RC1 runs on Release Candidate 1 for .NET 6.0, which also has a “go live” license. ...
This gets a bit more complicated when the TPC strategy is used. First, it’s important to understand that EF Core requires that all entities in a hierarchy must have a unique key value, even if the entities have different types. So, using our example model, aDogcannot have the sameIdkey...