type.Name, entity); if (null == fileds || fileds.Length == 0) { // 全字段操作 db.ObjectStateManager.ChangeObjectState return 0; } Type _type = typeof(T); db.AttachTo(_type.Name, entity); db.ObjectStateManager.ChangeObjectState entity); if (null == fileds || fileds.Length == 0) { // 全字段操作 db.ObjectStateManager.ChangeObjectState 手动设置为修改状态 } else { // 部分字段操作 var _stateEntry = db.ObjectStateManager.GetObjectStateEntry { Type _type = typeof(T); db.AttachTo(_type.Name, entity); db.ObjectStateManager.ChangeObjectState
override int SaveChanges(SaveOptions options) { foreach (EntityObject entity in this.ObjectStateManager.GetObjectStateEntries
1、无需先查询数据的修改方法 // 将创建的data实体添加到ObjectContext db.Data.Attach(data); // 手动设置状态为修改 db.ObjectStateManager.ChangeObjectState
2 更新报错: An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key. Refresh ObjectStateManager entries. 赋给主键一个不存在的值,令Id=4(在数据库表中不存在Id为4的一条记录)抛出的异常与上面的相同。
对象上下文中的对象状态由 ObjectStateManager 管理。 若要查找对象的状态,请调用以下 ObjectStateManager 方法之一:TryGetObjectStateEntry、GetObjectStateEntry 或GetObjectStateEntries student.Phone = "1101"; //先将实体附加到实体上下文中 schoolDB.Student.Attach(student); //手动修改实体的状态 schoolDB.ObjectStateManager.ChangeObjectState
using(Entities ctx = new Entities) { //product 已前台更新后 ctx.Attach(product); ctx.ObjectStateManager.ChangeObjectState Entities ctx = new Entities) { Product entity = new Product{Id =1} ctx.Attach(entity); ctx.ObjectStateManager.ChangeObjectState
student.Phone = "1101"; //先将实体附加到实体上下文中 schoolDB.Student.Attach(student); //手动修改实体的状态 schoolDB.ObjectStateManager.ChangeObjectState
//获取到user的状态实体,可以修改其状态 var setEntry = ((IObjectContextAdapter) db).ObjectContext.ObjectStateManager.GetObjectStateEntry
具体来说,对于需要删除的实体,现设定LastUpdatedBy属性,然后调用AcceptAllChanges方法,然后再调用ObjectStateManager的ChangeObjectState方法将状态设置为 contact.LastUpdatedBy = "Baz"; 11: context.AcceptAllChanges(); 12: context.ObjectStateManager.ChangeObjectState
IObjectContextAdapter)this).ObjectContext; foreach (ObjectStateEntry entry in objectContext.ObjectStateManager.GetObjectStateEntries
= EntityState.Detached)) 17 { 18 this.ObjectContext.ObjectStateManager.ChangeObjectState = EntityState.Detached)) 37 { 38 this.ObjectContext.ObjectStateManager.ChangeObjectState
//新的方法来保存 //hotelDB.Customer.Attach(entity);//附加到表对应集合缓冲中 //hotelDB.ObjectStateManager.ChangeObjectState
DBContext中则只有DBSet有这个功能,并且名称为成了Add context.Students.Add(newStudent): 也包括DeleteObject,ObjectStateManager = new DBContainer()) { db.SysSample.Attach(entity); db.ObjectStateManager.ChangeObjectState
db = new DBContainer()) { db.SysRole.Attach(entity); db.ObjectStateManager.ChangeObjectState
= new DBContainer()) { db.SysModule.Attach(entity); db.ObjectStateManager.ChangeObjectState