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microsoft.public.dotnet.framework.sdk

Serializing object graph with xmlSerializer

David Boaz

10/6/2002 9:13:00 AM

I have a class with two fields that refers to the same type.

when this refrences referes to the same instance, the referenced object is
serialized twice. when I deserialize the object, It creates two diffrent
object. how can I deserialze the object when the fields refers to the same
instance.

the example below shows the problem. note that before serrializing
x1.a==x1.b. but after deserializing x1.a != x1.b.

public class Test
{
public string name;
public Test a,b;
public Test(){}
public Test(string name)
{
this.name=name;
}

public static void Main()
{
Test x1=new Test("x1"),x2=new Test("x2");
x1.a=x2;
x1.b=x2;
serializeObject(x1,"simple.xml");

x1=deserializeObject("simple.xml");
x1.b.name="aaa";
Console.WriteLine("x1.a.name is:"+x1.a.name);
Console.WriteLine("x1.b.name is:"+x1.b.name);
}

private static void serializeObject(Test x,string filename)
{
XmlSerializer serializer = new XmlSerializer(typeof(Test));
Stream writer = new FileStream(filename, FileMode.Create);
serializer.Serialize(writer, x);
writer.Close();
}

private static Test deserializeObject(string filename)
{
XmlSerializer serializer = new XmlSerializer(typeof(Test));
Stream reader= new FileStream(filename,FileMode.Open);
return (Test) serializer.Deserialize(reader);
}
}

/*THE PROGRAM OUTPUT*/
x1.a.name is:x2
x1.b.name is:aaa

/*The serialized XML*/
<Test xmlns:xsd="http://www.w3.org/2001/XMLSc...
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance...
<name>x1</name>
- <a>
<name>x2</name>
</a>
- <b>
<name>x2</name>
</b>
</Test>

thanks David.