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Lesson Review
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You can use the following questions to test your knowledge of the information in Lesson 2, Defining Structural Contracts. The questions are also available on the companion CD if you prefer to review them in electronic form.
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Answers
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Answers to these questions and explanations of why each answer choice is correct or incorrect are located in the Answers section at the end of the book.
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1. You have the following Data contract:
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' VB <DataContract( _ Namespace:="http://schemas.fabrikam.com/customers/")> _ Public Class Address <DataMember(IsRequired:=False, Order:=0)> _ Public City As String <DataMember(IsRequired:=False, Order:=0)> _ Public AddressLine As String <DataMember(IsRequired:=False, Order:=1)> _ Public ZipOrPostalCode As String
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1
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Contracts
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<DataMember(IsRequired:=False)> _ Public StateOrProvince As String <DataMember(IsRequired:=False)> _ Public Country As String Public ApartmentNumber As String End Class // C# [DataContract( Namespace = "http://schemas.fabrikam.com/customers/")] public class Address { [DataMember(IsRequired = false, Order = 0)] public string City; [DataMember(IsRequired = false, Order = 0)] public string AddressLine; [DataMember(IsRequired = false,Order = 1)] public string ZipOrPostalCode; [DataMember(IsRequired = false)] public string StateOrProvince; [DataMember(IsRequired = false)] public string Country; public string ApartmentNumber; }
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What is the correct order in which the members of the contract will be emitted when serialized A. Country, StateOrProvince, AddressLine, City, ZipOrPostalCode B. Country, StateOrProvince, AddressLine, City, ZipOrPostalCode, ApartmentNumber C. AddressLine, City, ZipOrPostalCode, Country, StateOrProvince D. Country, StateOrProvince, City, AddressLine, ZipOrPostalCode 2. You have the following Message contract and Service contract that uses it:
' VB <MessageContract()> _ Public Class GreetingRequestMessage <MessageBodyMember(Name:="TheSalutation", _ Namespace:="http://www.fabrikam.com")> _ Public Greeting As String <MessageBodyMember(Name:="TheName", _ Namespace:="http://www.fabrikam.com")> _ Public Name As String
Lesson 2: Defining Structural Contracts
<MessageHeader(Name:="TheCustomHeader", _ Namespace:="http://www.fabrikam.com", _ MustUnderstand:=True)> _ Public CustomHeader As String End Class <ServiceContract( _ Namespace:="http://schemas.fabrikam.com/Greetings/")> _ Public Interface IGreeter <OperationContract( _ Action:="http://GreetingMessage/Action", _ ReplyAction:="http://HelloResponseMessage/Action")> _ Sub Greet(ByVal msg As GreetingRequestMessage) End Interface // C# [MessageContract()] public class GreetingRequestMessage { [MessageBodyMember(Name = "TheSalutation", Namespace = "http://www.fabrikam.com")] public string Greeting; [MessageBodyMember(Name = "TheName", Namespace = "http://www.fabrikam.com")] public string Name; [MessageHeader(Name = "TheCustomHeader", Namespace = "http://www.fabrikam.com", MustUnderstand = true)] public string CustomHeader; } [ServiceContract(Namespace = "http://schemas.fabrikam.com/Greetings/")] interface IGreeter { [OperationContract(Action = "http://GreetingMessage/Action", ReplyAction = "http://HelloResponseMessage/Action")] void Greet(GreetingRequestMessage msg); }
Which one of the following correctly represents what the incoming SOAP request message would look like if this Message contract were deployed A. The SOAP message would look most like:
<s:Envelope> <s:Header> <a:Action> http://GreetingMessage/Action </a:Action>
1
Contracts
<h:CustomHeader s:mustUnderstand="1" xmlns:h="http://www.fabrikam.com"> The custom header value </h:CustomHeader> <!-- etc... --> </s:Header> <s:Body etc...> <GreetingRequestMessage xmlns="http://schemas.fabrikam.com/Greetings/"> <Greeting xmlns="http://www.fabrikam.com"> Hello! </Greeting> <Name xmlns="http://www.fabrikam.com"> John Doe </Name> </GreetingRequestMessage> </s:Body> </s:Envelope>
B. The SOAP message would look most like:
<s:Envelope> <s:Header> <a:Action> http://GreetingMessage/Action </a:Action> <h:TheCustomHeader s:mustUnderstand="1" xmlns:h="http://www.fabrikam.com"> The custom header value </h:TheCustomHeader> <!-- etc... --> </s:Header> <s:Body etc...=""> <TheSalutation xmlns="http://www.fabrikam.com"> Hello! </TheSalutation> <TheName xmlns="http://www.fabrikam.com"> John Doe </TheName> </s:Body> </s:Envelope>
C. The SOAP message would look most like:
<s:Envelope> <s:Header> <a:Action> http://GreetingMessage/Action </a:Action>
Lesson 2: Defining Structural Contracts
<!-- etc... --> </s:Header> <s:Body etc...=""> <GreetingRequestMessage xmlns="http://schemas.fabrikam.com/Greetings/"> <h:TheCustomHeader s:mustUnderstand="1" xmlns:h="http://www.fabrikam.com"> The custom header value </h:TheCustomHeader> <TheSalutation xmlns="http://www.fabrikam.com"> Hello! </TheSalutation> <TheName xmlns="http://www.fabrikam.com"> John Doe </TheName> </GreetingRequestMessage> </s:Body> </s:Envelope>
D. The SOAP message would look most like:
<s:Envelope> <s:Header> <a:Action> http://GreetingMessage/Action </a:Action> <h:TheCustomHeader s:mustUnderstand="1" xmlns:h="http://www.fabrikam.com"> The custom header value </h:TheCustomHeader> <!-- etc... --> </s:Header> <s:Body etc...=""> <GreetingRequestMessage xmlns="http://schemas.fabrikam.com/Greetings/"> <TheSalutation xmlns="http://www.fabrikam.com"> Hello! </TheSalutation> <TheName xmlns="http://www.fabrikam.com"> John Doe </TheName> </GreetingRequestMessage> </s:Body> </s:Envelope>
1 Review
Review
To further practice and reinforce the skills you learned in this chapter, you can: Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real world situations involving the topics of this chapter and ask you to create solutions. Complete the suggested practices. Take a practice test.
Summary
To specify rigorously a service s contract with its consumers requires you to specify many details: Which operations are available How the request messages should be structured How the response messages are structured What patterns of message exchanges are required to converse with the service WCF provides service developers with a rich set of .NET attributes that comprise a model they can use to specify these details in the form of the following contracts: The Service contract that, like its open-standard counterpart WSDL, enables consumers to access the metadata that describes which operations will be available The Data contract that, like XSD in the XML space, is used to specify the structure of the data transported along with the service s messages. The Message contract that, like its open-standard counterpart SOAP, is used to specify which special header elements might be found in the messages and how those messages might be structured
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