ASMX WebServices issue

Question

We are sending the following request to a .Net 3.5 ASMX web service.

<SOAP-ENV:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    <SOAP-ENV:Body SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
        <Login xmlns="http://tempuri.org/" id="o0" SOAP-ENC:root="1">
          <password xsi:type="xsd:string">1234</password> 
          <userName xsi:type="xsd:string">Developer</userName> 
        </Login>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

On debugging, the web-service, we find that the parametr values available to the web method (login and method) are null. However if we remove the xsi:type= "xsd:string" attribute from the password and username, everything works.
The namespace xsd points to http://www.w3.org/2001/XMLSchema, which is valid.
Why can't .Net deserialize the response? and why does it not throw an exception? BTW: Our service definition aliases http://www.w3.org/2001/XMLSchema as "s". Could that be an issue?

Kind regards,

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DreamSonic DreamSonic · Accepted Answer · 2009-03-05T11:17:44

.NET serializers rely on the underlying schema to deserialize stuff. When you specify xsi:type attribute, you basically break the schema contract.

BTW. Don't use http://tempuri.org/, make up your own URI.

ASMX WebServices issue

2 Answers