NullableTypes / Discussion / Help: NullableTypes and XmlSerialization

Hi. I have a class with attributes that use the NullableTypes classes:

[Serializable]
public class Testing
{
NullableInt32 x;
NullableString y;

    public NullableInt32 X
    {
        get { return x; }
        set { x = value; }
    }

    public NullableString Y
    {
        get { return y; }
        set { y = value; }
    }
}

This class is on a web service and I need to return a big array of this class. So I'm serializing the array in a xml file and I'm sending it to a Windows Forms application using the WSE 2.0. Here is the web service method:

[WebMethod(EnableSession=true)]
public void GetTest()
{
    Testing[] tests = new Testing[3];
    tests[0] = new Testing();
    tests[1] = new Testing();
    tests[2] = new Testing();
    tests[0].X = 000;
    tests[0].Y = "zero";
    tests[1].X = 111;
    tests[1].Y = "one";
    tests[2].X = 222;
    tests[2].Y = "two";

    string basePath = AppDomain.CurrentDomain.BaseDirectory;
    string fileName = basePath + "test.txt";

    FileStream fileRet = new FileStream(fileName, FileMode.Create, FileAccess.ReadWrite);
    System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(typeof(Testing[]), new Type[] { typeof (NullableInt32), typeof(NullableString) });
    serializer.Serialize(fileRet, tests);

fileRet.Close();

    FileStream compressedFile = new FileStream(fileName, FileMode.Open);
    byte[] buffer = new byte[compressedFile.Length];
    compressedFile.Read(buffer, 0, Convert.ToInt32(compressedFile.Length));
    compressedFile.Close();

ResponseSoapContext.Current.Attachments.Add(new DimeAttachment("attachment", "application/octectstream", TypeFormat.Unknown, new MemoryStream(buffer)));
}

The generated file looks like this:
<?xml version="1.0"?>
<ArrayOfTesting xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Testing>
    <X>0</X>
    <Y>zero</Y>
</Testing>
<Testing>
    <X>111</X>
    <Y>one</Y>
</Testing>
<Testing>
    <X>222</X>
    <Y>two</Y>
</Testing>
</ArrayOfTesting>

This file is sent to the client application correctly and arrives exactly as above. But here comes the problem: when I try to deserialize this file into the array, all the properties have the null value (testing[0].X.IsNull returns true, as well the Y property).
Here is the client code:

WebService.ServiceWse service = new ServiceWse();
service.GetTest();
if (service.ResponseSoapContext.Attachments.Count > 0)
{
System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(typeof(Testing[]), new Type[] { typeof (NullableInt32), typeof(NullableString) });
tests2 = (Testing[])serializer.Deserialize(service.ResponseSoapContext.Attachments[0].Stream);

//Here is where tests[0].X.IsNull returns true
}

The WSE works perfectly, but I don't know how to load the correct values in the client application. Does anyone know what I'm doing wrong?

Thanks
Ricardo

NullableTypes and XmlSerialization

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NullableTypes and XmlSerialization