ADO.net Entity Framework 示例代码

查询

 AccountBookEntities context = new AccountBookEntities();
            ObjectQuery<Payment> query = context.CreateQuery<Payment>("AccountBookEntities.Payment");
            ObjectResult<Payment> result = query.Execute(MergeOption.NoTracking);

            this.dataGridView1.DataSource = result;

　　

增加   

AccountBookEntities context = new AccountBookEntities();
            
            Payment pay = new Payment();
            //pay.PaymentID = 8;
            pay.PaymentDate = DateTime.Now;
            pay.PaymentMoney = 100;
            pay.PaymentContent = "测'试";

            context.AddToPayment(pay);

            context.SaveChanges();

　　

删除 

AccountBookEntities context = new AccountBookEntities();

            var query = from pay in context.Payment
                        where pay.PaymentID == 2
                        select pay;

            foreach (Payment pay in query)
            {
                context.DeleteObject(pay);
            }

            context.SaveChanges();

　　

修改  

AccountBookEntities context = new AccountBookEntities();

            var query = from pay in context.Payment
                        where pay.PaymentID == 1
                        select pay;

            foreach (Payment pay in query)
            {
                pay.PaymentContent = "修改后";
            }

            context.SaveChanges();