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Lesson 2: Defining Structural Contracts
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[XmlSerializerFormat( Style = OperationFormatStyle.Document, Use = OperationFormatUse.Literal)] public interface IVehicleReservationService { [OperationContract()] OTA_VehResRS ReserveVehicle( [MessageParameter(Name = "OTA_VehResRQ")] OTA_VehResRQ reservationReq); } }
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You ll implement this service just enough for it to compile successfully; your only goal here is to explore the effects of declaring that the XmlSerializer is to be used, and you can explore these effects by simply reviewing the WSDL that the service generates. 8. Edit the VehicleReservationService file (.cs or .vb as appropriate) so that it becomes:
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' VB Imports OTASample.Vehicles.Entities Public Class VehicleReservationService Implements IVehicleReservationService Public Function ReserveVehicle( _ ByVal reservationReq As OTA_VehResRQ) _ As OTA_VehResRS _ Implements IVehicleReservationService.ReserveVehicle Dim resp As New OTA_VehResRS() ' ' ' ' In reality we'd build a response but for now we'll implement this service just enough for it to successfully compile by returning an empty response...
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Return resp End Function End Class // C# using using using using
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System; System.Xml.Serialization; System.Runtime.Serialization; System.ServiceModel;
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using OTASample.Vehicles.Entities; namespace OTASample.Vehicles.Service { public class VehicleReservationService : IVehicleReservationService { public OTA_VehResRS ReserveVehicle( OTA_VehResRQ reservationReq)
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Contracts
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{ OTA_VehResRS resp = new OTA_VehResRS(); // // // // In reality we'd build a response but for now we'll implement this service just enough for it to successfully compile by returning an empty response...
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return resp; } } }
9. Build the solution. 10. If you run this service and then explore the WSDL at http://localhost:8080/vehicles wsdl, drill down in particular to where the XML schemas are declared in the WSDL, which in this case is at http://localhost:8080/vehicles xsd=xsd0. You can go to this directly or drill down to it by first going to http://localhost:8080/vehicles wsdl=wsdl0. There you see that the XML schema matches exactly the schema you started with, namely, the OTA Vehicle Reservation request and response schemas. 11. To see the effect of declaring that the XmlSerializer is to be used, try running the service again and exploring the WSDL after commenting out the following declaration:
' VB <XmlSerializerFormat(Style:=OperationFormatStyle.Document, _ Use:=OperationFormatUse.Literal)> _ // C# [XmlSerializerFormat( Style = OperationFormatStyle.Document, Use = OperationFormatUse.Literal)]
When you do so, you will see a set of XML schema complexType elements that are vastly different from the OTA schemas.
CAUTION
Be sure to refresh the browser
If you have kept your browser open during this process, be sure you refresh the page when trying to explore the WSDL after commenting the declaration to use the XmlSerializer. Otherwise, the browser might have cached the old page, and you won t see any difference.
Lesson Summary
DataContract attributes declare types that will be used to specify the Data contract with consumers. Your service operations should always opt to use Data contracts over a list of parameters.
Lesson 2: Defining Structural Contracts
DataMember attributes declare which members of your types should be included, or opted in, in the Data contract. EnumMember attributes do the same for enumerations. You can use serializable collections that implement an Add operation in your Service contracts. For other collections not meeting those conditions, you can use the CollectionDataContract attribute to ensure that your own custom collections can be serialized as lists. MessageContract attributes define the structure of the SOAP messages your service processes, including both which custom elements should appear among the SOAP headers and how the SOAP body is structured, for example whether it is wrapped. The IExtensibleDataObject interface is used to design Data contracts that support both forward and backward compatibility in roundtrip versioning scenarios. DataContractFormat and XmlSerializerFormat attributes control which SOAP style (Rpc or Document) is used to serialize your SOAP messages. In addition, the XmlSerializerFormat attribute can be used to specify whether the SOAP usage will be Literal or Encoded. When building WCF services from an XML schema driven approach, you might be required to use the XmlSerializer to work with objects that will serialize to the desired XML.
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