System.InvalidC astException: Unable to cast object of type 'System.Xml.Xml Document' to type 'System.String'

[John Smith]

I'm writing webervice client using .Net 2.0. I have this class:

[System.Web.Serv ices.WebService BindingAttribut e(Name = "ValidateBindin g",
Namespace = "http://example.org/Avtentikacija")]
public class MyWebService : SoapHttpClientP rotocol
{
[System.Web.Serv ices.Protocols. SoapDocumentMet hodAttribute("" , Use =
System.Web.Serv ices.Descriptio n.SoapBindingUs e.Literal, ParameterStyle =
System.Web.Serv ices.Protocols. SoapParameterSt yle.Bare)]
public XmlDocument validate(string url,
[System.Xml.Seri alization.XmlEl ementAttribute( Namespace =
"http://www.example.org/PodpisaniDokume nt")] XmlDocument xmlDocument)
{
this.Url = url;
object[] results = null;
try
{
// ERROR occur at this line :(
results = this.Invoke("va lidate", new object[] { xmlDocument });
}
catch (Exception ex)
{
MessageBox.Show (ex.ToString()) ;
return null;
}
return ((XmlDocument)( results[0]));
}
}

and I call it like this:

XmlDocument xmlDocument = new XmlDocument();
xmlDocument.Pre serveWhitespace = true;
xmlDocument.Loa d("C:\\request. xml");

MyWebService web = new MyWebService();
xmlDocument =
web.validate("h ttp://localhost:8080/MyWeb/services/Avtentikacija",
xmlDocument);
if (xmlDocument != null)
xmlDocument.Sav e("C:\\response .xml");

And I got this error message:

System.InvalidO perationExcepti on: There was an error generating the XML
document. ---> System.InvalidC astException: Unable to cast object of type
'System.Xml.Xml Document' to type 'System.String' .
at
Microsoft.Xml.S erialization.Ge neratedAssembly .XmlSerializati onWriterMyWebSe rvice.Write1_va lidate(Object[]
p)
at
Microsoft.Xml.S erialization.Ge neratedAssembly .ArrayOfObjectS erializer.Seria lize(Object
objectToSeriali ze, XmlSerializatio nWriter writer)
at System.Xml.Seri alization.XmlSe rializer.Serial ize(XmlWriter xmlWriter,
Object o, XmlSerializerNa mespaces namespaces, String encodingStyle, String
id)
--- End of inner exception stack trace ---
at System.Xml.Seri alization.XmlSe rializer.Serial ize(XmlWriter xmlWriter,
Object o, XmlSerializerNa mespaces namespaces, String encodingStyle, String
id)
at System.Xml.Seri alization.XmlSe rializer.Serial ize(XmlWriter xmlWriter,
Object o, XmlSerializerNa mespaces namespaces, String encodingStyle)
at
System.Web.Serv ices.Protocols. SoapHttpClientP rotocol.Seriali ze(SoapClientMe ssage
message)
at System.Web.Serv ices.Protocols. SoapHttpClientP rotocol.Invoke( String
methodName, Object[] parameters)
at MyWeb.MyWebServ ice.validate(St ring url, XmlDocument xmlDocument) in
C:\Documents and Settings\I\My Documents\Visua l Studio
2005\Projects\M yWeb\MyWeb\Form 1.cs:line 152

Why? :(

[John Smith]

When I change this line:

results = this.Invoke("va lidate", new object[] { xmlDocument });

into this:

results = this.Invoke("va lidate", new object[] {
xmlDocument.Out erXml.ToString( ) });

it (almost) works. The problem is that it wraps my XML document into <url
http://www.example.org/Avtentikacija"> my xml here...</url> inside
<soap:body>, like this:

<soap:Body>
<url xmlns="http://sigen.si/Avtentikacija">
MyXML here...
</url>
</soap:Body>

Why? I don't want this! Webservice that I call can't parse it. It doesn't
expects <url></url> :(

[Zafar Abbas]

We need full service description, generated client proxy and request.xml to
figure out what is going wrong here. Could you please provde this
information?

Thanks,

Zafar

"John Smith" <jo********@mic rosoft.com> wrote in message
news:Kj******** ***********@new s.siol.net...

When I change this line:

results = this.Invoke("va lidate", new object[] { xmlDocument });

into this:

results = this.Invoke("va lidate", new object[] {
xmlDocument.Out erXml.ToString( ) });

it (almost) works. The problem is that it wraps my XML document into <url
http://www.example.org/Avtentikacija"> my xml here...</url> inside
<soap:body>, like this:

<soap:Body>
<url xmlns="http://sigen.si/Avtentikacija">
MyXML here...
</url>
</soap:Body>

Why? I don't want this! Webservice that I call can't parse it. It doesn't
expects <url></url> :(