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Note the lines marked in bold. The code attaches event handlers to NodeChanged, NodeRemoved, and NodeInserted events, respectively. These events are of delegate type XmlNodeChangedEventHandler. The code in Listing 2-24 shows these event handlers. Listing 2-24. Handling Events of the XmlDocument Class void doc_NodeRemoved(object sender, XmlNodeChangedEventArgs e) { MessageBox.Show("Node " + e.Node.Name + " removed successfully!"); } void doc_NodeInserted(object sender, XmlNodeChangedEventArgs e) { MessageBox.Show("Node " + e.Node.Name + " added successfully!"); } void doc_NodeChanged(object sender, XmlNodeChangedEventArgs e) { MessageBox.Show("Node " + e.Node.Name + " changed successfully!"); } The code in each event handler simply displays the node being affected in a message box. To test these events, you need to run the application and try updating, deleting, and adding new employees. You will find that with every such operation, the NodeChanging, NodeRemoving, and NodeInserting events are raised. Figure 2-14 shows a sample run of the application.

Now that you re passing parameters to the workflow, the workflow has to know how to accept them and it does this using the .NET property model. If you look at the preceding listing, you ll see that a parameter called age is used. Thus, you ll need to have a settable age property in your workflow. You can do this by adding some simple code to Workflow1.designer.cs:

The path to the file must start with a forward slash. The resource is loaded relative to the portlet application. To load files in the WEB-INF directory, use a path like /WEB-INF/content/homePage.xml. If the resource does not exist, the URL will be null. The portlet can directly access an InputStream for the resource with the getResourceAsStream() method on PortletContext. The semantics of the path are the same as the getResource() method, but this method returns an InputStream for convenience:

Summary

public InputStream getResourceAsStream (String path)

partial class Workflow1 { private int ageVal=0; public int age { set { ageVal = value; } } private CodeActivity codeActivity2; private IfElseBranchActivity ifElseBranchActivity2; private IfElseBranchActivity ifElseBranchActivity1; private IfElseActivity ifElseActivity1; private CodeActivity codeActivity1; }

The portlet should not use either of these methods to load JSP pages from the web application. The portal would not process or execute the JSP pages when loaded as a resource. We discuss including JSP pages in the portlet s output in the next chapter. If the MIME type for a resource in the portlet application is unknown, the portlet can ask the portlet context to determine the MIME type for a file. The getMimeType() method returns the resource s MIME type. Each portal will have a set of MIME type mappings. The web.xml deployment descriptor can contain any additional MIME types for the portlet application. The path argument is relative to the portlet application root, so /WEB-INF/content/nav.html would work.

This chapter presented a detailed examination of the XMLDocument class the .NET DOM parser. You worked with several other classes including XmlNode, XmlElement, XmlAttribute, and XmlText. You learned how to load XML documents, how to navigate through them, how to read the content, and finally how to modify them. You also learned how white space and namespaces can be dealt with. Finally, you handled various events of XmlDocument that are raised when you change the document in some way. You can build on what you have learned so far. For example, you can create your own custom extensions of XmlDocument and other classes by inheriting from them. Though the need to do so is rare, this task can be accomplished by inheriting from these classes and adding extra properties and methods.

This code has a private variable that is used to store the age, and a public settable one that maps whatever comes into the private variable. The next step is to add the workflow activities. For this application, you are going to implement an IfElse activity driven off a simple rule. If the entered age is over 100, you will go down one activity route; otherwise you will go down another. Drag an IfElse activity onto the design surface. The Designer should look like Figure 9-7.

public String getMimeType(String path)