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摘要： What happens if the records in the database that are represented by the entity classes have been changed after reading the record? The answer depends on the ConcurrencyMode property that is set with the model. With every property of an entity object, you can configure the ConcurrencyMode to Fixed or 阅读全文

摘要： If the entity object is already inside the object context, the existing one is used; otherwise it is fetched newly from the database.Invoking the method ApplyCurrentValues() passes the modified entity object to the object context,and if there are changes, then the changes are done within the existin 阅读全文

摘要： Majors functions and properties of ObjectContext class://// Summary:// Gets the object state manager used by the object context to track object// changes.//// Returns:// The System.Data.Objects.ObjectStateManager used by this System.Data.Objects.ObjectContext.public ObjectStateManager ObjectStateMan 阅读全文

摘要： The ObjectStateManager is used by the object context to keep track of entities that are loaded into the context.// Summary: // Occurs when entities are added to or removed from the state manager. public event CollectionChangeEventHandler ObjectStateManagerChanged;If two different queries are done th 阅读全文

摘要： Database :有三种方式来进行EF查询：LINQ to Entities, Entity SQL,和 Query Builder1.获取所有的Racer（Query Builder）：using (Formula1Entities data = new Formula1Entities(connection)) { ObjectSet<Racer> racers = data.Racers; Console.WriteLine(racers.CommandText); Console.WriteLine(racers.ToTraceString()); }racers.Com 阅读全文