本文将演示如何通过 Entity Framework 数据模型创建、修改、删除数据库记录。
插入
为了在数据库里创建新纪录，需要创建相应实体类的新实例，填充字段，把实体类加入 ObjectContext 派生类维护的 EntityCollection，然后调用 SaveChanges（）写入新纪录：
new Customer()
{
CustomerID = "LAWN",
CompanyName = "Lawn Wranglers",
ContactName = "Mr. Abe Henry",
ContactTitle = "Owner",
Address = "1017 Maple Leaf Way",
City = "Ft. Worth",
Region = "TX",
PostalCode = "76104",
Country = "USA",
Phone = "(800) MOW-LAWN",
Fax = "(800) MOW-LAWO"
};
NorthwindEntities db = new NorthwindEntities();
db.Customers.AddObject(cust);
db.SaveChanges();