SavaChange:对已添加,已修改或已删除状态的实体的数据库执行INSERT,UPDATE或DELETE命令。 SaveChangesAsync: SaveChanges()的异步方法 Set: 创建一个DbSet可以用来查询和保存实例的TEntity。 OnModelCreating 重写此方法以进一步配置通过DbSet派生上下文中属性中公开的实体类型按惯例发现的模型。 DbSet:表示可用于创建,读取,...
DbSet Update The DbSet<T> class provides Update and UpdateRange methods for working with an individual or multiple entities. language-csharp Explain code | Copy code public void Save(Author author) { context.Authors.Update(author); context.SaveChanges(); } This method results in the entity...
DbSet的Add方法不会立即查询EF中的数据库。DbSet的Add方法是用于将实体对象添加到DbContext中的DbSet集合中,以便在保存更改时将其插入到数据库中。它只是将实体对象添加到内存中的跟踪集合中,并不会立即触发对数据库的查询操作。只有在调用SaveChanges方法时,EF才会将内存中的更改保存到数据库中。因此,Add方法...
areas1和areas2显然是属于前两个城市的两个地区的集合。现在,您将只对城市进行AddOrUpdate,因为如果必...
meetingTitleTypeSet.AddOrUpdate(meetingTitleType); }else{ meetingTitleType.MeetingType = MeetingType.SetkaniTymu; } dbContext.SaveChanges();// Nastavit defaultní název setkání týmumeetingTitleType = meetingTitleTypeSet.First(mtt=>mtt.Title =="ST"); ...
示例2: UpdateLoaiDanhMuc ▼ //////Update lại biến Static LoaiDanhMuc///privatevoidUpdateLoaiDanhMuc(DbSet<Dm_LoaiDanhMuc> db){ MvcApplication.ListLoaiDanhMuc = db.ToList(); } 开发者ID:ACETeam90,项目名称:bacanhtai1,代码行数:7,代码来源:Dm_LoaiDanhMucController.cs 示例3: ...
One Update: Found an answer of the same issue on StackOverflow which works: replaceGroupJoinwithSelectMany var query = from documentType in entitySet from userGroupId in Repository.ConvertToBigIntTable(userGroupIds, "userGroupId") .Where(userGroupId => documentType.Id == userGroupId.Id) ....
共用方式為 Facebookx.comLinkedIn電子郵件 列印 發行項 2013/03/01 Question Friday, March 1, 2013 8:22 AM For some reason in this code here is giving me an error, but the method FirstOrDefault works fine in other entities User user = context.Users.FirstOrDefault(u => u.UserName.ToLo...
The code below throws an error. Note, it will not behave this way if there is only one other valid entity pending an update (below theuserandrolevariables are pending an update). And it will not behave this way if there is only one UserRole with a SQL issue (i.e. if you switch ...
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