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The HtmlShowOneDeckRenderer class is registered in faces-config.xml, as shown in Code Sample 3-31. Code Sample 3-31. Registering HtmlShowOneDeckRenderer < xml version="1.0" encoding="UTF-8" > <!DOCTYPE faces-config PUBLIC "-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN" "http://java.sun.com/dtd/web-facesconfig_1_1.dtd"> <faces-config> <render-kit> <!-- no renderkit-id, so these renderers are added to the default renderkit --> <renderer> <component-family> com.apress.projsf.ShowOne </component-family> <renderer-type> com.apress.projsf.Deck </renderer-type> <renderer-class> com.apress.projsf.ch3.render.html.basic.HtmlShowOneDeckRenderer </renderer-class> </renderer> </render-kit> </faces-config> To register the new HtmlShowOneDeckRenderer class as a Renderer for JSF, you need to add the metadata shown in bold to the same faces-config.xml file you used to register the UIShowOne and UIShowItem components. Code Sample 3-31 also omits the <render-kit-id> element, which will make the client-specific Renderer use the default RenderKit (with the identifier RenderKitFactory.HTML_BASIC_RENDER_KIT) provided by the JSF implementation. You also set <component-family> to com.apress.projsf.ShowOne, which represents the behavior of the UIShowOne component, and set <renderer-type> to com.apress.projsf.Deck, which represents the presentation of the UIShowOne component. The combination of component

// Create a DataContext. Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); // Retrieve customer LAZYK. Customer cust = (from c in db.Customers where c.CustomerID == "LAZYK" select c).Single<Customer>(); // Update the contact name. cust.ContactName = "Ned Plimpton"; try { // Save the changes. db.SubmitChanges(); } // Detect concurrency conflicts. catch (ChangeConflictException) { // Resolve conflicts. db.ChangeConflicts.ResolveAll(RefreshMode.KeepChanges); }

However, if I try to call the ToUpper method on the string class itself, I will get a compiler error because the ToUpper method is an instance level method and I am attempting to call it on the class, rather than the object. Listing 2-12 shows an example of an attempt to do this, and the compiler error generated by it. Listing 2-12. Trying to Call an Instance Method on a Class // This code will not even compile. string.ToUpper(); Just trying to compile this code produces the following compiler error:

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N ote This example requires generation of entity classes, which we will cover later in this chapter.

An object reference is required for the nonstatic field, method, or property 'string.ToUpper()' This example seems a little hokey though since it couldn t possibly work because I never gave it any string value to convert to uppercase. Any attempt to do so though would result in trying to call some variation of the ToUpper method that does not exist because there is no prototype for the ToUpper method whose signature includes a string. Contrast the ToUpper method with the string class Format method. This method is defined to be static. This requires the Format method to be called on the string class itself, rather than on an object of type string. First I will try to call it on an object with the code in Listing 2-13. Listing 2-13. Trying to Call a Class Method on an Object string firstName = "Joe"; string lastName = "Rattz"; string name = firstName.Format("{0} {1}", firstName, lastName); Console.WriteLine(name); This code produces the following compiler error: Member 'string.Format(string, object, object)' cannot be accessed with an instance reference; qualify it with a type name instead However, if instead I call the Format method on the string class itself, it compiles and works as desired, as demonstrated in Listing 2-14. Listing 2-14. Calling a Class Method on a Class string firstName = "Joe"; string lastName = "Rattz"; string name = string.Format("{0} {1}", firstName, lastName); Console.WriteLine(name); The code produces the following results:

In Listing 12-1, we used LINQ to SQL to query the record whose CustomerID field is "LAZYK" from the Northwind database s Customers table and to return a Customer object representing that record. We then updated the Customer object s ContactName property and saved the change to the database by

family and render type uniquely identifies which Renderer class to use with the component com.apress.projsf.ch3.render.html.basic.HtmlShowOneDeckRenderer. For more information about this, please refer to 1.

It is sometimes obvious from parts of the signature other than the static keyword itself that the method must be an instance-level method. For example, consider the ToUpper method. It doesn t have any arguments other than one overloaded version taking a CultureInfo object reference. So if it isn t relying on a string instance s internal data, what string would it convert to uppercase

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