using System.Data.Entity; using System.Data.Entity.Infrastructure; using System.Data.Entity.Core.Objects; using System.Linq;publicpartial class SchoolDBEntities : DbContext {publicSchoolDBEntities() : base("name=SchoolDBEntities") { } protected override void OnModelCreating(DbModelBuilder modelBuilder)...
/// Updates an existing entity. /// /// Id of the entity /// Action that can be used to change values of the entity /// <returns>Updated entity</returns> Task<TEntity> UpdateAsync(TPrimaryKey id, Func<TEntity, Task> updateAction); #endregion Update #region Delete /// /// ...
如果这多个实体都是新实体或者都是已有实体,则和之前一样直接调用context.Add和context.Update方法操作他们的父实体或root实体就行了。 如果多个实体状态不一致,有新实体有旧实体,且主键都是自动生成的,则同上直接调用context.Update方法即可: public static void InsertOrUpdateGraph(DbContext context, object rootEnti...
update, and delete (CRUD). They also need to persist any changes made by these operations between application restarts. Although there are various options for persisting data in .NET applications, Entity Framework (EF) Core is a user-friendly solution and a great fit for many .NET applica...
如果遇到无法解决的问题,请将你的代码与完成的项目进行比较。 获取帮助的一个好方法是使用ASP.NET Core 标记或EF Core 标记将问题发布到 StackOverflow.com。 示例应用 这些教程中所构建的应用是一个基本的大学网站。 用户可以查看和更新学生、课程和讲师信息。 以下是在本教程中创建的几个屏幕。
public void UpdateEntity<T>(T modifiedEntity) where T : class { var set = Core.CreateObjectSet<T>(); set.ApplyCurrentValues(modifiedEntity); } 最後一項改變,我的模型專案是能夠編譯。 現在是時間來處理斷代碼在我的 UI 和模型之間的層數。Merge...
Announcing Entity Framework EFCore 5.0 RC1, a "go-live" supported release. This release includes new features such as many-to-many.
at Microsoft.EntityFrameworkCore.DbContext.Update[TEntity](TEntity entity) What did I do wrong? All replies (8) Monday, April 12, 2021 2:42 AM ✅Answered Hi Gatwick, Gatwick I wonder why the first way (with .Entity calls) doesn't work. The parameter received by the DbContext.Upda...
MyDbContext dbContext = new MyDbContext(); var result = dbContext.Test.AsNoTracking().FirstOrDefault
This is the codebase for Entity Framework 6 (previously maintained at https://entityframework.codeplex.com). Entity Framework Core is maintained at https://github.com/dotnet/efcore. - dotnet/ef6