Serilization problems

[Stephan Schlicker]

Hi everyone

I have a serious problem with the serilization of an user-defined object in
C#. I would like to serialize an object of class D which inherits from class
C. Class C as well as class D are marked with the compiler-attribute
[Serializable] (see also code-snippet at the end of the message).
It is no problem to serialize a instance of class C, but I got the following
error-message if I try to serialize a instance of class D:

An unhandled exception of type
System.Runtime. Serialization.S erializationExc eption: The type <Namespace>.B
in Assembly <AssemblyName >, Version=0.0.0.0 , Culture=neutral ,
PublicKeyToken= null is not marked as serializes.

The problem I have is, that the variable which causes the Exception is a
member of the base-class C which can be serialized without any problems.
In addition to that, the variable is also marked with the
[NonSerialized]-attribute, so the value of this variable should not be
serialized (see also in the code-snippet).

Thanks for any help!

greetings stephan
Code:

public class A : MarshalByRefObj ect, IDisposable
{
//some ints, Hashtables, IPAddresses (all
//Serializable)

protected A a
}
public class B : A
{
protected new B a
}
[Serializable]
public class C : MarshalByRefObj ect, IDisposable
{
[NonSerialized]
protected B a;

//some Guids and longs (all serializable)
}
[Serializable]
public class D: C
{
[NonSerialized]
private static CDBInterface cDBInterface = new CDBInterface();

//some Hashtables (all serializable)
}

[Nicholas Paldino [.NET/C# MVP]]

Stephan,

Using the code that you provided, I can serialize and deserialize the
instance of D no problem.

I do not think that you should "new" any of the members of the classes,
as you will have to make sure to account for both the value on the base
class and the derived class.

Can you post an example that shows the problem?

Also, you don't have to mark static members as non-serializable, as they
are not eligibile for serialization.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Stephan Schlicker" <St************ **@discussions. microsoft.com> wrote in
message news:7C******** *************** ***********@mic rosoft.com...

Hi everyone

I have a serious problem with the serilization of an user-defined object
in
C#. I would like to serialize an object of class D which inherits from
class
C. Class C as well as class D are marked with the compiler-attribute
[Serializable] (see also code-snippet at the end of the message).
It is no problem to serialize a instance of class C, but I got the
following
error-message if I try to serialize a instance of class D:

An unhandled exception of type
System.Runtime. Serialization.S erializationExc eption: The type
<Namespace>.B
in Assembly <AssemblyName >, Version=0.0.0.0 , Culture=neutral ,
PublicKeyToken= null is not marked as serializes.

The problem I have is, that the variable which causes the Exception is a
member of the base-class C which can be serialized without any problems.
In addition to that, the variable is also marked with the
[NonSerialized]-attribute, so the value of this variable should not be
serialized (see also in the code-snippet).

Thanks for any help!

greetings stephan
Code:

public class A : MarshalByRefObj ect, IDisposable
{
//some ints, Hashtables, IPAddresses (all
//Serializable)

protected A a
}
public class B : A
{
protected new B a
}
[Serializable]
public class C : MarshalByRefObj ect, IDisposable
{
[NonSerialized]
protected B a;

//some Guids and longs (all serializable)
}
[Serializable]
public class D: C
{
[NonSerialized]
private static CDBInterface cDBInterface = new CDBInterface();

//some Hashtables (all serializable)
}

[Stephan Schlicker]

Hi Nicolas

Using the code that you provided, I can serialize and deserialize the
instance of D no problem.

I do not think that you should "new" any of the members of the classes, as you will have to make sure to account for both the value on the base
class and the derived class. Yes, I now that problem! But at the moment this solution works just fine.
Can you post an example that shows the problem? I'll try to give you an example. I'm sorry that I can not post the whole
code because it's code for my master thesis and this code is also supposed
to build the base of some non-open-source software!

[Serializable]
public class C : MarshalByRefObj ect, IDisposable
{
[NonSerialized]
protected B framework;
protected Guid systemID;
protected long userID;

public C(long _userID, B _framework)
{
this.userID = _userID;
this.framework = _framework;
this.RegisterAt Framework();
}
}

[Serializable]
public class D: C
{
[NonSerialized]
private static CDBInterface cDBInterface = new CDBInterface();
[NonSerialized]
private Hashtable x = new Hashtable();
[NonSerialized]
private Hashtable y = new Hashtable();
[NonSerialized]
private Hashtable z = new Hashtable();
public CustomerManager (long userID, SimMarketAgentF ramework
framework) : base(userID, framework)
{
ArrayList d = new ArrayList();
foreach(C c in a.Values)
d.Add(c);
this.framework. Register(this.f ramework.Framew orkID, d,
this.userID);
}
}

Those are all Members of both classes and their corresponding Constructor
which I use!
After all objects are created I manually call the following method for one
speciall instance of D:

public void Send(IPAddress address, Guid iD)
{
C c = (c)this.cRefere nces[ID];
B framework = (B)Activator.Ge tObject(typeof( B), "http://" + address
+ ":1234/B.soap");

MemoryStream stream = new MemoryStream();
BinaryFormatter formatter = new BinaryFormatter ();
formatter.Conte xt = new
System.Runtime. Serialization.S treamingContext (StreamingConte xtStates.Clone) ;
formatter.Seria lize(stream, c);

bool received = framework.Recei ve(stream);

if(received)
{
c.Dispose();
this.cReference s.Remove(agentI D);
}
}

And the last statement which is executed correctly is
formatter.Conte xt(...)! The statement formatter.Seria lize(stream, c) crashes
and produces that mentioned exception!

Also, you don't have to mark static members as non-serializable, as they are not eligibile for serialization.

I don't have any static members at the moment!

[Nick Malik]

> >

Also, you don't have to mark static members as non-serializable, as

they

are not eligibile for serialization.

I don't have any static members at the moment!

Hi Stephan,

This is from your code:
[NonSerialized]
private static CDBInterface cDBInterface = new CDBInterface();
I think this is what Nicholas was talking about.

--- Nick