Entity Framework Learning Primary 7--Basic operations: Add, UPDATE, delete, transaction

This section, write directly through the code to learn. These basic operations are simpler, and the content associated with these basic operations is basically covered in the previous sections 1 through 6.

L Increase:

Method 1: Use the addtoxxx (XXX) method: the instance code is as follows:

using (var edm = new NorthwindEntities())

{

Customers c = new Customers { CustomerID = "c#", City = "成都市", Address = "中国四川省", CompanyName = "cnblogs", Country = "中国", Fax = "10086", Phone = "1008611", PostalCode = "610000", Region = "天府广场", ContactName = "风车车.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);

}

Method 2: Use the ObjectContext addobject (string entitySetName, Object entity) method. The instance code is as follows:

using (var edm = new NorthwindEntities())

{

Customers c = new Customers { CustomerID = "c2", City = "成都市2", Address = "中国四川省2", CompanyName = "cnblogs", Country = "中国", Fax = "10086", Phone = "1008611", PostalCode = "610000", Region = "天府广场", ContactName = "风车车.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);

}