// Update one existing person
public static void UpdatePerson()
{
using (EFO2OEntities context = new EFO2OEntities())
{
Person person = new Person();
person.PersonID = 1;
context.AttachTo("Person", person);
person.LastName = "Chen";
// Set the foreign key as null
person.PersonAddress = null;
try
{
Console.WriteLine("Modifying Person 1's LastName to {0}"
+ ", and PersonAddress to null", person.LastName);
context.SaveChanges();
Query();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
// Get all the people with their addresses
public static void Query()
{
using (EFO2OEntities context = new EFO2OEntities())
{
var query = from p in context.Person.Include("PersonAddress")
select p;
Console.WriteLine("People with their addresses:");
foreach (Person p in query)
{
Console.WriteLine("{0} {1}", p.PersonID, p.LastName);
if (p.PersonAddress != null)
{
Console.WriteLine(" {0}", p.PersonAddress.Address);
}
}
Console.WriteLine();
}
}
// Insert new person with new personAddress
public static void InsertPersonWithPersonAddress()
{
using (EFO2OEntities context = new EFO2OEntities())
{
Person person = new Person()
{
FirstName = "Lingzhi",
LastName = "Sun"
};
// The PersonID in PersonAddress will be 27 because it
// depends on person.PersonID
PersonAddress personAddress = new PersonAddress()
{
PersonID = 100,
Address = "Shanghai",
Postcode = "200021"
};
// Set navigation property (one-to-one)
person.PersonAddress = personAddress;
context.AddToPerson(person);
try
{
Console.WriteLine("Inserting a person with "
+ "person address");
context.SaveChanges();
Query();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
// 获取带有addresses的所有people
public static void Query()
{
using (EFO2OEntities context = new EFO2OEntities())
{
var query = from p in context.Person.Include("PersonAddress")
select p;
Console.WriteLine("People with their addresses:");
foreach (Person p in query)
{
Console.WriteLine("{0} {1}", p.PersonID, p.LastName);
if (p.PersonAddress != null)
{
Console.WriteLine(" {0}", p.PersonAddress.Address);
}
}
Console.WriteLine();
}
}
// 使用personAddress插入新的person
public static void InsertPersonWithPersonAddress()
{
using (EFO2OEntities context = new EFO2OEntities())
{
Person person = new Person()
{
FirstName = "Lingzhi",
LastName = "Sun"
};
// PersonAddress中的PersonID将是27因为它依赖于person.PersonID
PersonAddress personAddress = new PersonAddress()
{
PersonID = 100,
Address = "Shanghai",
Postcode = "200021"
};
// 设置navigation属性 (一对一)
person.PersonAddress = personAddress;
context.AddToPerson(person);
try
{
Console.WriteLine("Inserting a person with "
+ "person address");
context.SaveChanges();
Query();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
// 使用personAddress插入新的person
public static void InsertPersonWithPersonAddress()
{
using (EFO2OEntities context = new EFO2OEntities())
{
Person person = new Person()
{
FirstName = "Lingzhi",
LastName ="Sun"
};
// PersonAddress中的PersonID将是27因为它依赖于person.PersonID
PersonAddress personAddress = new PersonAddress()
{
PersonID = 100,
Address = "Shanghai",
Postcode = "200021"
};
// 设置navigation属性 (一对一)
person.PersonAddress = personAddress;
context.AddToPerson(person);
try
{
Console.WriteLine("Inserting a person with "
+ "person address");
context.SaveChanges();
Query();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
// 更新一个现存的person
public static void UpdatePerson()
{
using (EFO2OEntities context = new EFO2OEntities())
{
Person person = new Person();
person.PersonID = 1;
context.AttachTo("Person", person);
person.LastName = "Chen";
// 将外键设置为空
person.PersonAddress = null;
try
{
Console.WriteLine("Modifying Person 1's LastName to {0}"
+ ", and PersonAddress to null", person.LastName);
context.SaveChanges();
Query();
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}