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A. Use the Add Reference dialog box to set a reference to the WSDL file that contains
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the web service.
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B. Use the Add Web Reference dialog box to point to the URL of the web service. c. Write a method in your website that has the same function signature as your web
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service. Do not implement this method. Instead, mark it with the WebMethod attribute.
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3. D. Call a proxy class that represents your web service.
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You need to secure your web service. The service will be accessed over the Internet by multiple systems of different types. Authentication information should be secured. You want to trust only those clients who have been verified as trusted. What type of security should you consider
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A. Windows Basic B. Windows Digest c. Client certificates D. Custom SOAP headers
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592 ChAPTER 10
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Writing and Working with HTTP Modules and Web Services
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You want to create a web service and call it from client-side script. What actions should you take (Choose all that apply.)
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A. Add the ScriptService attribute to the web service class. B. Write client-side JavaScript to call your service through a proxy object. c. Add a ScriptManager class to your webpage. Set the ServiceReference to point to
the ASMX web service.
D. Make sure that your webpage and service are in the same domain.
Lesson 3: Creating and Consuming WCF services
In the previous lesson, you learned about creating XML web services with ASP.NET. This is a very useful, straightforward way to create web services that you intend to host in IIS and call over HTTP. However, the service model can be extended beyond HTTP. For example, you might want to write a service that is accessed inside the firewall over Transmission Control Protocol (TCP) instead of HTTP. Working over TCP within your own application often results in better performance than you would attain with services implemented by using HTTP. In earlier versions of the .NET Framework, this meant that you wrote the service by using Remoting. However, if the same service code needed to be called over both HTTP and TCP, you had to write and host it twice. This is one of the many problems that WCF solves. WCF is a unifying programming model. It defines a single approach to writing services and thereby unify technologies such as web services (ASMX), .NET Remoting, Microsoft Message Queue (MSMQ), Enterprise Services (COM+), and Web Services Enhancements (WSE). It does not replace these technologies on an individual basis. Instead, it provides a single programming model that you can use to take advantage of all of these technologies at once. With WCF, you can create a single service that can be exposed as HTTP, TCP, named pipes, and so on. You also have multiple hosting options. This lesson covers the basics of WCF to give you a solid footing when working with this technology. This lesson is not all-encompassing on WCF. Rather, it focuses on those areas inside WCF that are specific to ASP.NET development: writing, hosting, and calling WCF services with ASP.NET websites.
After this lesson, you will be able to:
Understand the architecture of WCF. Create a WCF service in ASP.NET and host it. Call a WCF service from an ASP.NET webpage. Create and consume a WCF Data Service.
Estimated lesson time: 45 minutes
Lesson 3: Creating and Consuming WCF Services
ChAPTER 10
Introducing WCF
Before you build your first Windows Communication Foundation (WCF) service application, it is important for you to get an overview of how the technology works. WCF enables messagebased communication to and from endpoints. You write your service and then attach, or configure, the endpoints. A service can have one or more endpoints attached to it. Each WCF endpoint defines a location to which messages are sent and received. This location includes an address, a binding, and a contract. This address, binding, and contract concept is often referred to as the ABCs of WCF. The following list describes each of these in detail:
A is for address The endpoint s address is a Uniform Resource Identifier (URI) that defines the location of the service. Each endpoint of a service must have a unique address. Therefore, if you have a service that exposes more than one endpoint (or transport protocol), you will uniquely identify the address based on the endpoint s transport protocol. This might mean changing a port number, defining the address as HTTPS, or taking a similar action. b is for binding The binding defines how the service communicates, via such protocols as HTTP, TCP, MSMQ, Binary HTTP, and so on. The protocol used is referred to as the binding s transport. You can add multiple bindings to a single service. Bindings can include other information, too, such as encoding and security. Each binding must, at a minimum, define a transport. C is for contract The contract represents the public definition, or interface, of the service. It defines things such as the namespace of the service, how messages should be sent, callbacks, and related contract items. There are multiple contract types in WCF, including service contracts, operation contracts, message contracts, fault contracts (for error handling), and data contracts. These contracts work together to indicate to the client code that is consuming the WCF service how it should define communication messages.
After you have defined your WCF service and configured at least one endpoint, you must host it. There are a few options for this, which are discussed later in this section. However, the host that this lesson focuses on is IIS and ASP.NET. To call the service, a client generates a compatible endpoint. This endpoint indicates where the service is, how communication should work, and the format of that communication. At run time, clients typically initiate requests to a hosted service. Like a web service, the WCF service processes the request and returns results all by using the defined endpoint information. The good news is that there are multiple tools and plentiful configuration support options for creating WCF services. Again, it is still important to understand how this works. As an additional overview, the following section presents the layers of the WCF architecture.
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