Determining the type to deserialize to

Hi all,

I have two applications that send messages to one another using Names Pipes.
At one end, a class is serialized into a string using standard XML Serialization
[Serializable]
public class MyClassA
{
    public String s1;
    public String s2;
    public MyClassA()
    {
        s1 = "";
        s2 = "";
    }
}

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To perform the Serialization and Deserialization, I am using the following
public static string SerializeObject<T>(this T toSerialize)
{
    string xmlstream = String.Empty;
    using (MemoryStream memstream = new MemoryStream())
    {
        XmlSerializer xmlSerializer = new XmlSerializer(typeof(T));
        XmlTextWriter xmlWriter = new XmlTextWriter(memstream, Encoding.UTF8);
        xmlSerializer.Serialize(xmlWriter, toSerialize);
        xmlstream = UTF8ByteArrayToString(((MemoryStream)xmlWriter.BaseStream).ToArray());
    }
    return xmlstream;
}

public static T DeSerializeObject<T>(String toDeSerialize)
{
    T tempObject = default(T);
    using (MemoryStream memoryStream = new MemoryStream(StringToUTF8ByteArray(toDeSerialize)))
    {
        XmlSerializer xs = new XmlSerializer(typeof(T));
        XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.UTF8);
        tempObject = (T)xs.Deserialize(memoryStream);
    }
    return tempObject;           
}

public static String UTF8ByteArrayToString(Byte[] ArrBytes) { return new UTF8Encoding().GetString(ArrBytes); }
public static Byte[] StringToUTF8ByteArray(String XmlString) { return new UTF8Encoding().GetBytes(XmlString); }

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When I receive the message, I decode it using:
MyClassA cls = DeSerializeObject<MyClassA>(message_string);

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and it works great.

Now, if I receive a message that is a different class, how can I determine this before attempting to Deserialize it?

Any help would be appreciated

James
LVL 4
James AtkinSenior Principle Software EngineerAsked:
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AndyAinscowFreelance programmer / ConsultantCommented:
Assuming you are passing the XML string between the two apps via the pipe you could prepend a string with the class type.

eg.
Sending:
string s = "MyClassA;" + xmlString;
or
string s = "AnotherClassB;" + xmlString;


and receiving you strip of the first part up to the ';' and then
if(sTag == "MyClassA")
  deserialise_classA;
else if(sTag=="AnotherClassB")
  deserialise_classB
and so on
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James AtkinSenior Principle Software EngineerAuthor Commented:
Perfect, thanks :-)
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