Web接口中的方法肯定是public的，因为是必须的，所以C#干脆禁止你写访问符 接口是什么?举例. 猫，狗，鱼都是（is）动物，继承动物类。动物共有的特征，吃，睡，动等。猫狗鱼继承了动物，他们也都有吃睡动的特征。 但是猫，狗有（has）[掉毛]这种行为。 WebBegins tracking the given entity and entries reachable from the given entity using the Unchanged state by default, but see below for cases when a different state will be used. C#. public virtual Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry Attach (TEntity entity) where TEntity : class;

Entity Framework AddOrUpdate - Learn How to Add or Update …

WebJun 5, 2013 · When you do an Attach() of an Entity Framework object to a new DbContext, it is entered with State EntityState.Unchanged. This happens regardless of whether or … WebEntity Framework Classic Attach & AttachRange Description. To improve the performance, you can now use AttachRange when attaching multiple entities. The performance gain is … ikea wall cabinet anchor strength

DbContext.Attach Method (Microsoft.EntityFrameworkCore)

WebThe DbContext class provides Update and UpdateRange methods for working with individual or multiple entities. public void Save(Author author) {. context.Update(author); context.SaveChanges(); } As with setting the entity's State, this method results in the entity being tracked by the context as Modified. WebOn the other hand, DbSet.Attach (entity) attaches the entity to the context without marking it dirty. It is equivalent to doing context.Entry (entity).State = EntityState.Unchanged; When attaching this way, unless you then proceed to update a property on the entity, the next time you call context.SaveChanges (), EF will not generate a database ... WebIn Entity Framework, you can generate GUIDs automatically for new entities by using the DatabaseGenerated attribute with the DatabaseGeneratedOption.Identity option on the primary key property of the entity.. Here's an example: csharppublic class MyEntity { [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public Guid Id { get; set; } // … ikea wall bucket holder