Serialization problem

[Saso]

Hi,

I would like to serialize an instance of the bitmap instance. Actually, I've
done serialization with the code below, but why parameter Tag is not
serialized? I get the following exception after deserialization: Object
reference is not set to an instance of an object.
// Instance of bitmap.
Bitmap B = new Bitmap(100, 100);
// Add additional property to the bitmap.
B.Tag = 100;

// Serialize.
FileStream fs = new FileStream("test.dat", FileMode.Create);
BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(fs, B);
fs.Close();

// Deserialize.
FileStream fs2 = new FileStream("test.dat", FileMode.Open);
BinaryFormatter bf2 = new BinaryFormatter();
Bitmap B2 = (Bitmap)bf2.Deserialize(fs2);
fs2.Close();

int tag = (int)B2.Tag;

All I want is to add the additional property to the bitmap instance, which
must be serialized. Is there any other way to do that?

Thank you.

Regards
Saso

[Baski]

Saso,

In Bitmap basclass Tag might have been marked as non serialiable. What
you can do , Create your own bitmap class derived from Bitmap and override
Tag property or create your own property to store your variable. Dont forget
to mark your class with [Serializable()] attribute.

Thanks
Baski

"Saso" <Sa**@discussions.microsoft.comwrote in message
news:85**********************************@microsof t.com...

Hi,

I would like to serialize an instance of the bitmap instance. Actually,
I've
done serialization with the code below, but why parameter Tag is not
serialized? I get the following exception after deserialization: Object
reference is not set to an instance of an object.
// Instance of bitmap.
Bitmap B = new Bitmap(100, 100);
// Add additional property to the bitmap.
B.Tag = 100;

// Serialize.
FileStream fs = new FileStream("test.dat", FileMode.Create);
BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(fs, B);
fs.Close();

// Deserialize.
FileStream fs2 = new FileStream("test.dat", FileMode.Open);
BinaryFormatter bf2 = new BinaryFormatter();
Bitmap B2 = (Bitmap)bf2.Deserialize(fs2);
fs2.Close();

int tag = (int)B2.Tag;

All I want is to add the additional property to the bitmap instance, which
must be serialized. Is there any other way to do that?

Thank you.

Regards
Saso

[Saso]

Baski,

I already tryed to derive from bitmap class, but unfortunately it can not be
derived from sealed type such System.Drawing.Bitmap is. Any suggestion?

Regards.

Saso

"Baski" wrote:

Saso,

In Bitmap basclass Tag might have been marked as non serialiable. What
you can do , Create your own bitmap class derived from Bitmap and override
Tag property or create your own property to store your variable. Dont forget
to mark your class with [Serializable()] attribute.

Thanks
Baski

"Saso" <Sa**@discussions.microsoft.comwrote in message
news:85**********************************@microsof t.com...

Hi,

I would like to serialize an instance of the bitmap instance. Actually,
I've
done serialization with the code below, but why parameter Tag is not
serialized? I get the following exception after deserialization: Object
reference is not set to an instance of an object.
// Instance of bitmap.
Bitmap B = new Bitmap(100, 100);
// Add additional property to the bitmap.
B.Tag = 100;

// Serialize.
FileStream fs = new FileStream("test.dat", FileMode.Create);
BinaryFormatter bf = new BinaryFormatter();
bf.Serialize(fs, B);
fs.Close();

// Deserialize.
FileStream fs2 = new FileStream("test.dat", FileMode.Open);
BinaryFormatter bf2 = new BinaryFormatter();
Bitmap B2 = (Bitmap)bf2.Deserialize(fs2);
fs2.Close();

int tag = (int)B2.Tag;

All I want is to add the additional property to the bitmap instance, which
must be serialized. Is there any other way to do that?

Thank you.

Regards
Saso