EntityFramework 学习一 Validate Entity

【EntityFramework 学习一 Validate Entity】的更多相关文章

EntityFramework 学习一 Validate Entity

可以为实体实现自定义验证,重写DBContext中的个ValidateEntity方法 protected override System.Data.Entity.Validation.DbEntityValidationResult ValidateEntity(DbEntityEntry entityEntry, System.Collections.Generic.IDictionary<object, object> items) { if (entityEntry.Entity is…

EntityFramework 学习一 Colored Entity in Entity Framework 5.0

You can change the color of an entity in the designer so that it would be easy to see related groups of entities in the designer from Visual Studio 2012 onwards. To change the color of an entity, select entity in the designer → go to property window…

EntityFramework 学习一 Update Entity Graph using DbContext:

使用主键属性每个实体必须有主键默认值的id属性值必须为0 在context2中,它不知道实体的状态, 只能通过实体的主键来判断实体的状态如果主键为0,则是新的对象,不为0 就是修改 Standard disconnectedStandard = null; using (var context = new SchoolDBEntities()) { context.Configuration.ProxyCreationEnabled = false; disconnectedStandar…

EntityFramework 学习一 Add Entity Graph using DbContext:

//Create student in disconnected mode Student newStudent = new Student() { StudentName = "New Single Student" }; //Assign new standard to student entity newStudent.Standard = new Standard() { StandardName = "New Standard" }; //add new…

EntityFramework 学习一 Delete Entity using DBContext in Disconnected Scenario

Student studentToDelete; . Get student from DB using (var ctx = new SchoolDBEntities()) { studentToDelete = ctx.Students.Where(s => s.StudentName == "Student1").FirstOrDefault<Student>(); } //Create new context for disconnected scenario…

Entityframework：“System.Data.Entity.Internal.AppConfig”的类型初始值设定项引发异常。

<configSections>  <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFramewor…

Entity Framework Tutorial Basics（40）：Validate Entity

Validate Entity You can write custom server side validation for any entity. To accomplish this, override ValidateEntity method of DBContext as shown below. protected override System.Data.Entity.Validation.DbEntityValidationResult ValidateEntity(DbEnt…