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Figure 5-1. Four views of a window showing how when windows and panes change size, the visual elements in a WPF UI can automatically change size and position.

By now, you should have a basic understanding of URL routing in MVC and how important it is. Routing is very flexible, and the default can be modified by changing the rules in global.asax. Right-click global.asax (it handles global events within your application) and select View Code. Your code will look similar to the following: public static void RegisterRoutes(RouteCollection routes) { routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); routes.MapRoute( "Default", "{controller}/{action}/{id}", new { controller = "Home", action = "Index", id = "" } ); } protected void Application_Start() { RegisterRoutes(RouteTable.Routes); } // Route name // URL with parameters // Parameter defaults

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Under certain conditions, you can assign an object to an array element even if the object is not of the array s base type. This property of arrays is called array covariance. You can use array covariance if the following are true: The array is a reference type array. There is an implicit or explicit conversion between the type of the object you are assigning and the array s base type.

This chapter contains many samples of XAML to illustrate specific points. The XAML for the window containing the visual elements is pretty much the same each time, except for the name of the window and its size. Rather than clutter the samples with the boilerplate part of the code, in each section I ll just list the XAML for the specific visual element. Figure 5-2 shows an example of a whole XAML tree. The nongrayed markup is the boilerplate code, and the grayed markup shows where the XAML for the specific visual element should be placed.

But what s this code doing I will tackle the line routes.MapRoute first. This maps the default route the user will be sent to (in this case, ASP.NET MVC will send them to ~/home/index) if they do not enter a controller or action. Thus, if you want to alter the default view that ASP.NET MVC will serve up when the user goes to the root of your site, this is the place to do it. The line routes.IgnoreRoute tells ASP.NET MVC to ignore any requests ending in the .axd extension, which is used by IIS to route incoming requests to HTTP modules and handlers. This is often done in order to generate something dynamically, such as a thumbnail image or chart. You don t want ASP.NET MVC to interfere with these types of requests, so this line tells ASP.NET MVC to ignore requests for any files ending in .axd. You will want to create custom routes sooner or later. For example, in the movie theatre example it would be useful if users could access information about a popular film by going to www.bobsMovies.com/ kungFuPanda/ rather than something less memorable like www.bobsMovies.com/film/detail/2. To implement this, all you need to do is add the route with the routes.MapRoute method. Add the following route before the existing call to MapRoute: routes.MapRoute( "PopularFilm", "KungFuPanda", new { controller = "Film", action = "Detail", id = 1 } ); // Route name // URL with parameters // Parameter defaults

Since there is always an implicit conversion between a derived class and its base class, you can always assign an object of a derived class to an array declared for the base class. For example, the following code declares two classes, A and B, where class B derives from class A. The last line shows covariance by assigning objects of type B to array elements of type A. Figure 14-15 shows the memory layout for the code. class A { ... } class B : A { ... } class Program { static void Main() { // Two arrays of type A[] A[] AArray1 = new A[3]; A[] AArray2 = new A[3]; // Normal--assigning objects of type A to an array of type A AArray1[0] = new A(); AArray1[1] = new A(); AArray1[2] = new A(); // Covariant--assigning objects of type B to an array of type A AArray2[0] = new B(); AArray2[1] = new B(); AArray2[2] = new B(); } } // Base class // Derived class

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