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If you followed along in the previous examples, you will have noticed that a variety of out-of-the-box activities were available to you. You used two of them the Code activity and the IfElse activity. In addition to these, WF offers a few more: Compensate: This is an activity that you can use in case of an error, and is used with the FaultHandler activity. You use the Compensate activity to undo actions that have already been performed, in a similar manner to a rollback in database transactions. ConditionedActivityGroup (CAG): You use a CAG to specify a group of activities where each one has its own criteria. When a condition for the group as a whole is met, execution passes out of the group. Delay: This activity allows you to put pauses of a specified duration into your workflow. EventDriven: This contains other activities to execute in response to an event firing. FaultHandler: This allows you to handle errors. When an error occurs, you can direct to a fault handler (like a Catch statement in code) and specify the actions to follow. InvokeWebService: This is used to communicate with a web service via its proxy class. A proxy class can be generated by the IDE when you make a reference to a web service. Parallel: This allows you to specify multiple parallel routes of execution, and will not complete until all routes are complete.

Instead of using the built-in logging functionality from the PortletContext object, we recommend that you use Apache s log4j (http://logging.apache.org/ log4j) project for your logging. log4j s main features are the ability to format logging output, the ability to redirect logging output to multiple locations, and support for different levels of logging. The logging level for log4j can be raised or lowered dynamically on a per-class or per-package basis.

In this section, you will learn the following: How to open XML documents by using the XmlTextReader class How to read and access the content How to deal with white space How to work with name tables How to deal with namespaces Let s begin by opening XML documents. Throughout our examples, we will be using the same Employees.xml file that we used earlier in the book.

Replicator: This is a conditional looping activity that creates a number of instances of a single activity. When they are all complete, the activity will be complete. Sequence: This is used to link activities together in sequence. Once all have been completed, it will complete. Terminate: This activity ends the current workflow. Throw: This is used to raise an exception from within a workflow or other activity. While: This works like a While loop in programming parlance, executing an activity repeatedly until a condition is met.

A portlet can access some information about the portlet container through the PortletContext object. Other information about the portal server itself is available on the PortalContext object, which we discuss in 7. The getServerInfo() method on the PortletContext object returns a String object that contains the name and the version number of the portlet container:

To illustrate how XML documents can be opened, we will develop a Windows application like the one shown in Figure 3-1.

These simple examples of workflow applications were hosted within a console application. When it comes to the Web, you may want to consider using workflow for your middleware and back-end transactions. As such, you will either want to host it in an ASP .NET web page or web service, or ideally, publish it as a web service that your other applications can use. Fortunately, WF supports the latter you can publish your workflows as web services and reuse them, calling them with SOAP standards from other applications or web sites. The best way to learn how to do this is by example, so let s create a new project, but this time make it a sequential workflow library and call it CToFService. Once it is done, you ll get the design surface for the workflow. The first thing you ll need to do is to expand the Workflow1.cs node in the Solution Explorer, select Workflow1.designer.cs, and add the following interface declaration to it:

public String getServerInfo()

The server information will be returned in this format: Portlet Container Name/Version Number, for instance, Pluto/1.0 .

public interface CToF { double doCToF(double nC); }