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C H APTE R 9 XM L WEB S ERVI CES
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Message property of both of these exception classes gives you the detailed error message, and the Code property gives the SOAP fault code details. To test the application, run it and click the Get Employees button without specifying any credentials. You should get a message box as shown in Figure 9-16 that informs you about the SoapHeaderException.
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Figure 9-16. Catching a SoapHeaderException Similarly, enter some invalid credentials and click the Get Employees button again. This time the message box should resemble Figure 9-17.
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Figure 9-17. Catching SoapException Finally, if you supply valid credentials and then click the Get Employees button, your form should resemble Figure 9-15.
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Understanding the WSDL Document
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While developing your first web service in this chapter, you learned that WSDL is an XML vocabulary that describes the web service in terms of web methods exposed, their parameters, data types, and return values. Though you will rarely modify or construct WSDL yourself (at least when you are using Visual Studio), it is helpful to understand the internal structure of the WSDL document. This way, your understanding of the web service metadata will broaden. You will also find the knowledge of WSDL useful while learning Windows Communication Foundation services, which are covered in 12. Let s see the WSDL of a simple Hello World web service that we created initially in this chapter. We will be using this web service only as a sample. The discussion that follows is applicable to any other WSDL document also. The WSDL of the preceding web service is shown in Listing 9-24.
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CHAPTER 9 XML WEB SERVICE S
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Listing 9-24. A Sample WSDL Document < xml version="1.0" encoding="utf-8" > <wsdl:definitions xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:tm="http://microsoft.com/wsdl/mime/textMatching/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/" xmlns:tns="http://tempuri.org/" xmlns:s="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/" xmlns:http="http://schemas.xmlsoap.org/wsdl/http/" targetNamespace="http://tempuri.org/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"> <wsdl:types> <s:schema elementFormDefault="qualified" targetNamespace="http://tempuri.org/"> <s:element name="HelloWorld"> <s:complexType /> </s:element> <s:element name="HelloWorldResponse"> <s:complexType> <s:sequence> <s:element minOccurs="0" maxOccurs="1" name="HelloWorldResult" type="s:string" /> </s:sequence> </s:complexType> </s:element> </s:schema> </wsdl:types> <wsdl:message name="HelloWorldSoapIn"> <wsdl:part name="parameters" element="tns:HelloWorld" /> </wsdl:message> <wsdl:message name="HelloWorldSoapOut"> <wsdl:part name="parameters" element="tns:HelloWorldResponse" /> </wsdl:message> <wsdl:portType name="ServiceSoap"> <wsdl:operation name="HelloWorld"> <wsdl:input message="tns:HelloWorldSoapIn" /> <wsdl:output message="tns:HelloWorldSoapOut" /> </wsdl:operation> </wsdl:portType>
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C H APTE R 9 XM L WEB S ERVI CES
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<wsdl:binding name="ServiceSoap" type="tns:ServiceSoap"> <soap:binding transport="http://schemas.xmlsoap.org/soap/http" /> <wsdl:operation name="HelloWorld"> <soap:operation soapAction="http://tempuri.org/HelloWorld" style="document" /> <wsdl:input> <soap:body use="literal" /> </wsdl:input> <wsdl:output> <soap:body use="literal" /> </wsdl:output> </wsdl:operation> </wsdl:binding> <wsdl:binding name="ServiceSoap12" type="tns:ServiceSoap"> <soap12:binding transport="http://schemas.xmlsoap.org/soap/http" /> <wsdl:operation name="HelloWorld"> <soap12:operation soapAction="http://tempuri.org/HelloWorld" style="document" /> <wsdl:input> <soap12:body use="literal" /> </wsdl:input> <wsdl:output> <soap12:body use="literal" /> </wsdl:output> </wsdl:operation> </wsdl:binding> <wsdl:service name="Service"> <wsdl:port name="ServiceSoap" binding="tns:ServiceSoap"> <soap:address location="http://localhost:2230/WebApplication3/Service.asmx" /> </wsdl:port> <wsdl:port name="ServiceSoap12" binding="tns:ServiceSoap12"> <soap12:address location="http://localhost:2230/WebApplication3/Service.asmx" /> </wsdl:port> </wsdl:service> </wsdl:definitions> If you observe the WSDL markup in Listing 9-24, you can identify six parts of the document. These six parts are the core elements of any WSDL document and are listed in Table 9-3.
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CHAPTER 9 XML WEB SERVICE S
Table 9-3. Parts of WSDL
Part
types message portType binding port service
Description
The <wsdl:types> element encloses all the type definitions from the web service. A message is the XML data that is being carried between the web service and its client. The <wsdl:message> element represents this message. The <wsdl:portType> section contains a list of operations (web methods) exposed by the web service. A binding is the protocol and format used by the port. It is represented by the <wsdl:binding> markup tag. A port is an endpoint of web service communication. It is represented by the <wsdl:port> markup tag. A service is the collection of one or more ports. It is represented by the <wsdl:service> markup tag.
Let s look at each of these parts in more detail.
The Messages
You learned previously that web service communication works on the basis of a request and response model. A web service request as well as response consists of SOAP data. This SOAP data is called a SOAP message. Each web method has a message that represents a request for the web method and a message that represents the response from that web method. Thus our HelloWorld() web method will have two messages: The name of the request message is of the form XXXXSoapIn, where XXXX is the name of the web method. Similarly, the name of the response message is of the form XXXXSoapOut, where XXXX is the name of the web method. The WSDL message elements provide a consolidated list of all the messages exposed by the web service. The message names provided by this list are used everywhere else in the WSDL document.
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