Entity Framework學習初級篇7--基本操作：增加、更新、刪除、事務

本節，直接寫通過代碼來學習。這些基本操作都比較簡單，與這些基本操作相關的內容在之前的1至6節基本介紹完畢。

l　增加：

方法1：使用AddToXXX(xxx)方法：實例代碼如下：

using (var edm = new NorthwindEntities())

{

Customers c = new Customers { CustomerID = "c#", City = "成都市", Address = "中國四川省", CompanyName = "cnblogs", Country = "中國", Fax = "10086", Phone = "1008611", PostalCode = "610000", Region = "天府廣場", ContactName = "風車車.Net" };

edm.AddToCustomers(c);

int result = edm.SaveChanges();

Assert.AreEqual　(result, 1);

Customers addc = edm.Customers.FirstOrDefault(cc => cc.CustomerID == "c#");

Console.WriteLine("CustomerId={0},City={1}", addc.CustomerID, addc.City);

}

方法2：使用ObjectContext的AddObject(string entitySetName, object entity)方法。實例代碼如下：

using (var edm = new NorthwindEntities())

{

Customers c = new Customers { CustomerID = "c2", City = "成都市2", Address = "中國四川省2", CompanyName = "cnblogs", Country = "中國", Fax = "10086", Phone = "1008611", PostalCode = "610000", Region = "天府廣場", ContactName = "風車車.Net" };

edm.AddObject("Customers", c);

int result = edm.SaveChanges();

Assert.AreEqual　(result, 1);

Customers addc = edm.Customers.FirstOrDefault(cc => cc.CustomerID == "c2");

Console.WriteLine("CustomerId={0},City={1}", addc.CustomerID, addc.City);

}