Játszottam kicsit az EF4-gyel. Az alábbi kód egy n rétegű app adatmozgását szimulálja a WCF xml szerializálóját használva. Mindhárom template-tel kipróbáltam, alább láthatóak az adatmozgások.
A tesztkód messze nem korrekt, de kiindulópontként további vizsgálatokhoz elfogatható:
using System;
using System.IO;
using System.Linq;
using System.Runtime.Serialization;
namespace POCO1
{
class Program
{
static void Main()
{
Department d;
using (var e = new SchoolEntities())
{
e.ContextOptions.ProxyCreationEnabled = false;
e.ContextOptions.LazyLoadingEnabled = false;
d = e.Departments.Include("Courses").Single(dep => dep.DepartmentID == 1);
Console.WriteLine("{0}", d.Name);
Console.WriteLine("---------------------");
foreach (Course c in d.Courses)
{
Console.WriteLine("{0}", c.Title);
}
e.Detach(d);
}
var ser = new DataContractSerializer(d.GetType());
//var ser = new DataContractSerializer(d.GetType(),
//null, 50000, true, true, null, new ProxyDataContractResolver());
using (var s2c = new FileStream(@"c:\temp\Server2Client.xml", FileMode.Create, FileAccess.ReadWrite))
{
//1. Server küld kliensre
ser.WriteObject(s2c, d);
s2c.Position = 0;
//2. Kliens deserializál
var clientSideDep = (Department)ser.ReadObject(s2c);
//Csak ST
//bool ce = clientSideDep.ChangeTracker.ChangeTrackingEnabled;
//3. Kliens módosít
clientSideDep.Name += "a";
using (var c2s = new FileStream(@"c:\temp\Client2Server.xml", FileMode.Create, FileAccess.ReadWrite))
{
//4. Kliens visszaküld
ser.WriteObject(c2s, clientSideDep);
c2s.Position = 0;
//5.Server deserializál
var sentBackDepartment = (Department)ser.ReadObject(c2s);
using (var e = new SchoolEntities())
{
//6. Server visszamódosít
//Normál entitás
e.Departments.Attach(sentBackDepartment);
e.ObjectStateManager.GetObjectStateEntry(sentBackDepartment).SetModified();
e.ObjectStateManager.GetObjectStateEntry(sentBackDepartment).SetModifiedProperty("Name");
//POCO
//e.Departments.Include("Courses").Single(dep => dep.DepartmentID == 1);
//e.Departments.ApplyCurrentValues(sentBackDepartment);
//Self-tracking entity
//e.Departments.ApplyChanges(sentBackDepartment);
e.SaveChanges();
}
}
}
}
}
}
EF alapobjektumok szerviz => kliens:
<Department z:Id="i1" xmlns="http://schemas.datacontract.org/2004/07/POCO1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:z="http://schemas.microsoft.com/2003/10/Serialization/">
<EntityKey z:Id="i2" xmlns="http://schemas.datacontract.org/2004/07/System.Data.Objects.DataClasses" xmlns:a="http://schemas.datacontract.org/2004/07/System.Data">
<a:EntityContainerName>SchoolEntities</a:EntityContainerName>
<a:EntityKeyValues>
<a:EntityKeyMember>
<a:Key>DepartmentID</a:Key>
<a:Value i:type="b:int" xmlns:b="http://www.w3.org/2001/XMLSchema">1</a:Value>
</a:EntityKeyMember>
</a:EntityKeyValues>
<a:EntitySetName>Departments</a:EntitySetName>
</EntityKey>
<Administrator>2</Administrator>
<Budget>350000.0000</Budget>
<Courses/>
<DepartmentID>1</DepartmentID>
<Name>Engineering</Name>
<StartDate>2007-09-01T00:00:00</StartDate>
</Department>
EF alapobjektumok kliens => szerviz:
<Department z:Id="i1" xmlns="http://schemas.datacontract.org/2004/07/POCO1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:z="http://schemas.microsoft.com/2003/10/Serialization/">
<EntityKey z:Id="i2" xmlns="http://schemas.datacontract.org/2004/07/System.Data.Objects.DataClasses" xmlns:a="http://schemas.datacontract.org/2004/07/System.Data">
<a:EntityContainerName>SchoolEntities</a:EntityContainerName>
<a:EntityKeyValues>
<a:EntityKeyMember>
<a:Key>DepartmentID</a:Key>
<a:Value i:type="b:int" xmlns:b="http://www.w3.org/2001/XMLSchema">1</a:Value>
</a:EntityKeyMember>
</a:EntityKeyValues>
<a:EntitySetName>Departments</a:EntitySetName>
</EntityKey>
<Administrator>2</Administrator>
<Budget>350000.0000</Budget>
<Courses/>
<DepartmentID>1</DepartmentID>
<Name>Engineeringa</Name>
<StartDate>2007-09-01T00:00:00</StartDate>
</Department>
POCO szerviz => kliens:
<Department xmlns="http://schemas.datacontract.org/2004/07/POCO1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Administrator>2</Administrator>
<Budget>350000.0000</Budget>
<Courses/>
<DepartmentID>1</DepartmentID>
<Name>Engineeringa</Name>
<StartDate>2007-09-01T00:00:00</StartDate>
</Department>
POCO kliens => szerviz:
<Department xmlns="http://schemas.datacontract.org/2004/07/POCO1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Administrator>2</Administrator>
<Budget>350000.0000</Budget>
<Courses/>
<DepartmentID>1</DepartmentID>
<Name>Engineeringaa</Name>
<StartDate>2007-09-01T00:00:00</StartDate>
</Department>
Self-tracking entity, szerviz => kliens:
<Department z:Id="i1" xmlns="http://schemas.datacontract.org/2004/07/POCO1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:z="http://schemas.microsoft.com/2003/10/Serialization/">
<Administrator>2</Administrator>
<Budget>350000.0000</Budget>
<ChangeTracker z:Id="i2">
<ExtendedProperties/>
<ObjectsAddedToCollectionProperties/>
<ObjectsRemovedFromCollectionProperties/>
<OriginalValues/>
<State>Unchanged</State>
</ChangeTracker>
<Courses/>
<DepartmentID>1</DepartmentID>
<Name>Engineeringaaaaaaaa</Name>
<StartDate>2007-09-01T00:00:00</StartDate>
</Department>
Self-tracking entity, kliens => szerviz:
<Department z:Id="i1" xmlns="http://schemas.datacontract.org/2004/07/POCO1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:z="http://schemas.microsoft.com/2003/10/Serialization/">
<Administrator>2</Administrator>
<Budget>350000.0000</Budget>
<ChangeTracker z:Id="i2">
<ExtendedProperties/>
<ObjectsAddedToCollectionProperties/>
<ObjectsRemovedFromCollectionProperties/>
<OriginalValues/>
<State>Modified</State>
</ChangeTracker>
<Courses/>
<DepartmentID>1</DepartmentID>
<Name>Engineeringaaaaaaaaa</Name>
<StartDate>2007-09-01T00:00:00</StartDate>
</Department>
Érdekes, hogy a módosítás ténye csak a ST-ben látszik, még az eredeti entity-sben sem. A POCO-tól nem is vártuk persze.
Később még majd foglalkozok bővebben a témával. Aki játszani akar vele, hozza létre a School EF példaadatbázist, azon lehet futtatni.
