// Disconnected Student entity var stud = new Student(){ StudentId = 1, Name = "Bill" }; stud.Name = "Steve"; using (var context = new SchoolContext()) { context.Update<Student>(stud); // or the followings are
在EF Core 1.1中依然存在Add、Attach、Update方法,我们通过上下文或者DbSet<TEntity>能够看到,当将实体传递到这些方法中时,它们与实体追踪可达图紧密联系在一起,比如说我们之前讨论的博客的导航属性文章的发表,当我们添加文章的发表的这个实体时,然后调用Add方法后此时文章的发表这个实体也就被添加。在EF 6.x中我们说...
在EF Core 1.1中依然存在Add、Attach、Update方法,我们通过上下文或者DbSet<TEntity>能够看到,当将实体传递到这些方法中时,它们与实体追踪可达图紧密联系在一起,比如说我们之前讨论的博客的导航属性文章的发表,当我们添加文章的发表的这个实体时,然后调用Add方法后此时文章的发表这个实体也就被添加。在EF 6.x中我们说...
在EF Core 1.1中依然存在Add、Attach、Update方法,我们通过上下文或者DbSet<TEntity>能够看到,当将实体传递到这些方法中时,它们与实体追踪可达图紧密联系在一起,比如说我们之前讨论的博客的导航属性文章的发表,当我们添加文章的发表的这个实体时,然后调用Add方法后此时文章的发表这个实体也就被添加。在EF 6.x中我们说...
a new entity was added, and an identity Id was assigned to my local variable. This seems to be the Upsert I was looking for, but that begs the question... if Update will either automatically add or update an entity depending on whether it exists or not, then what's the use of the...
Update single values on an entity REQUIRES: using EntityFramework.Utilities; db.AttachAndModify(item).Set(x=>x.Property,"NewValue") A simpler API for working with disconnected entities and only updating single values. This is useful if you want to update a value on an entity without roundtri...
UpdateEntityType(IEntityType) 方法 參考 意見反應 定義 命名空間: Microsoft.EntityFrameworkCore.Query 組件: Microsoft.EntityFrameworkCore.Relational.dll 套件: Microsoft.EntityFrameworkCore.Relational v7.0.0 來源: EntityProjectionExpression.cs 更新投影到其中一個衍生類型的實體類型。 ...
DbSet<TEntity> DbUpdateConcurrencyException DbUpdateException DbUpdateException 建構函式 屬性 DeleteBehavior DeleteBehaviorAttribute EF EntityFrameworkQueryableExtensions EntityState EntityTypeConfigurationAttribute EntityTypeConfigurationAttribute<TConfiguration,TEntity> EntityTypeExtensions ExecutionStrategyExtensions IDbCont...
I will suggest to use stored procedure with EF to update the required fields only. Please seehttp://learnentityframework.com/LearnEntityFramework/tutorials/using-stored-procedures-for-insert-update-amp-delete-in-an-entity-data-model/ The downside of using stored procedure is that you have to us...
First is automatically by Convention, in which case the Discriminator column is not directly in the Entity but is Shadow Property. And second is to explicitly define Discriminator property in Entity and configure it with .HasDiscriminator(). An important remark regarding the first case is that sin...