我在尝试使用ASP.NET消费PHP SOAP webservice时遇到了一些重大问题。所涉及的webservice基于PHP SOAP扩展，并由以下WSDL描述：
<?xml version="1.0" encoding="UTF-8" ?>
<definitions name="MyServices"
targetNamespace="http://mydomain.com/api/soap/v11/services"
xmlns:tns="http://mydomain.com/api/soap/v11/services"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsd1="http://mydomain.com/api/soap/v11/services"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
xmlns="http://schemas.xmlsoap.org/wsdl/">
<types>
<schema targetNamespace="http://mydomain.com/api/soap/v11/services" xmlns="http://www.w3.org/2001/XMLSchema">
<complexType name="ServiceType">
<all>
<element name="id" type="xsd:int" minOccurs="1" maxOccurs="1" />
<element name="name" type="xsd:string" minOccurs="1" maxOccurs="1" />
<element name="cost" type="xsd:float" minOccurs="1" maxOccurs="1" />
</all>
</complexType>
<complexType name="ArrayOfServiceType">
<all>
<element name="Services" type="ServiceType" minOccurs="0" maxOccurs="unbounded" />
</all>
</complexType>
</schema>
</types>
<message name="getServicesRequest">
<part name="postcode" type="xsd:string" />
</message>
<message name="getServicesResponse">
<part name="Result" type="xsd1:ArrayOfServiceType"/>
</message>
<portType name="ServicesPortType">
<operation name="getServices">
<input message="tns:getServicesRequest"/>
<output message="tns:getServicesResponse"/>
</operation>
</portType>
<binding name="ServicesBinding" type="tns:ServicesPortType">
<soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
<operation name="getServices">
<soap:operation soapAction="http://mydomain.com/api/soap/v11/services/getServices" />
<input>
<soap:body use="encoded" namespace="urn:my:services" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" />
</input>
<output>
<soap:body use="encoded" namespace="urn:my:services" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" />
</output>
</operation>
</binding>
<service name="MyServices">
<port name="ServicesPort" binding="tns:ServicesBinding">
<soap:address location="http://mydomain.com/api/soap/v11/services"/>
</port>
</service>
</definitions>
我可以在Visual Studio中成功生成此WSDL的代理类，但尝试调用getServices方法时，出现了异常：
System.Web.Services.Protocols.SoapHeaderException: Procedure 'string' not present
检查SOAP服务器端的原始POST数据后，我的PHP SOAP客户端发出的请求如下：
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<SOAP-ENV:Body>
<postcode xsi:type="xsd:string">ln4 4nq</postcode>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
而 .Net 代理类正在执行以下操作：
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:tns="http://mydomain.com/api/soap/v11/services"
xmlns:types="http://mydomain.com/api/soap/v11/services/encodedTypes"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body soap:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/">
<xsd:string xsi:type="xsd:string">LN4 4NQ</xsd:string>
</soap:Body>
</soap:Envelope>
我只能假设邮政编码参数发送的方式不同是问题所在，但作为一名主要从事PHP开发的人，我对这里发生的事情感到困惑。我有一种感觉，在我的WSDL中可能缺少了一些至关重要的内容，因为我看过无数个“使用.Net消费PHP SOAP WebServices”的例子，这些例子似乎表明它“只需要运行”。如果您能提出任何建议，指出我在哪里犯了错误，我将不胜感激。我现在已经花了将近一整天的时间来解决这个问题；-）谢谢您的帮助，Jamie