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();