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After clicking the Save button, I am taken to the next field settings page, which shows that there aren t any field settings assigned to the Event Color field (e.g., maximum length). Click the Save settings button to display the overall settings page for the Event (see Figure 8-9). There on this form, I ll enter the help text I want displayed below the field on the form and the default color value that will be used when the node edit form is displayed. I ll click the Save settings button to finish the process of adding the field to the node edit form for Events.

Defines namespaces and types that you can use for serializing and deserializing objects in the WCF framework. This core assembly contains the types used to build any sort of WCF application.

These two assemblies define many new namespaces and types. You should consult the .NET Framework 4.0 SDK documentation for complete details; however, Table 25-2 documents the roles of some of the important namespaces.

Figure 8-9. Setting the configuration options for the new Event Color field With the field added to the Event content type, I m ready to test it out. Navigating to Add content -> Event reveals the new Event s RGB Color field on the form with the default value (see Figure 8-10).

Defines many types you use to control how data is serialized and deserialized within the WCF framework. This primary WCF namespace defines binding and hosting types, as well as basic security and transactional types. Defines numerous types that provide programmatic access to WCF configuration files. Defines types that provide an object model to the addresses, bindings, and contracts defined within WCF configuration files. Contains types to integrate with the MSMQ service. Defines numerous types to control aspects of the WCF security layers.

In addition to System.ServiceModel.dll and System.Runtime.Serialization.dll, WCF provides a third assembly named System.IdentityModel.dll. This assembly contains many additional namespaces and types that support the CardSpace API. This technology allows you to establish and manage digital identities within a WCF application. Essentially, the CardSpace API provides a unified programming model to account for various security-related details for WCF applications, such as caller identity, user authentication/authorization services, and so on. You will not examine CardSpace further in this edition of the book, so be sure to consult the .NET Framework 4.0 SDK documentation if you want to learn more.

As will be explained in more detail later in this chapter, a WCF application is typically represented by three interrelated assemblies, one of which is a *.dll that contains the types that external callers can communicate with (in other words, the WCF service itself). When you wish to build a WCF service, it is perfectly permissible to select a standard Class Library project template (see 14) as a starting point and manually reference the WCF assemblies. Alternatively, you can create a new WCF service by selecting the WCF Service Library project template of Visual Studio 2010 (see Figure 25-2). This project type automatically sets references to the

Figure 8-10. The new Event RGB Color field on the node edit form After saving the Event, the new field is displayed formatted as defined in the module s formatter functions. The image in Figure 8-11 displays the text in the color defined when the node was created, which in the example I created is red.

required WCF assemblies; however, it also generates a good deal of starter code, which you will more likely than not delete.

Figure 25-2. The Visual Studio 2010 WCF Service Library project template One benefit of selecting the WCF Service Library project template is that it also supplies you with an App.config file, which might seem strange because you are building a .NET *.dll, not a .NET *.exe. However, this file is useful because, when you debug or run your WCF Service Library project, the Visual Studio 2010 IDE will automatically launch the WCF Test Client application. This program (WcfTestClient.exe) will look up the settings in the App.config file, so it can host your service for testing purposes. You ll learn more about the WCF Test Client later in this chapter.