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Hi,
I am working with the beta version of the new .net framework (Whidbey) and I
encountered a problem with serialization that did'nt exist in the .net 2003
the situation is like this :
I have a class that inherits from dataset, and I want to serialize it , so I
created a serialization constructor that forwards the call to the base class
(the dataset) serialization constructor, normally, for this action to
succeed I am supposed to put an attribute on the super class (in this case
the dataset) that looks like that :
[XmlInclude (typeOf (<myClass>))]
so that the serializer will be able to deserialize my class where a dataset
was daclared, the problem is, that I can't put this attribute on the
dataset.
currrently the serializer is able to serialize my class but when it
desirializes it I get a dataset object and I can't cast it to the derived
class (casting fails),
so I need an alternative way to let the serializer know about the derived
class, so if anyone knows a way to do this without using the attribute I
would appreciate his help.
code sample that demonstrates the situation:
// the derived class
[Serializeable]
public class MyDataSet : DataSet
{
public MyDataSet() : base()
{
}
// serialization constructor
public MyDataSet(Serialization info,StreamingContext context) :
base(info,context)
{
}
}
// serializing the class
......
.......
MyDataSet ds = new MyDataSet();
XmlSerializer ser = new XmlSerializer(typeof(DataSet));
StringWriter writer = new StringWriter();
ser.Serialize(writer, ds);
........
........
// desirializing the class
MyDataSet newDs = new MyDataSet();
StreamReader reader = new StreamReader("Ser.Xml", Encoding.UTF8);
newDs = ser.Deserialize(reader) as MyDataSet; // at this point the casting
fails and returns null.
.......
.......
thanks , ofer.
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