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The System.Activator class (defined in mscorlib.dll) is the key to the .NET late binding process. For the current example, you are only interested in the Activator.CreateInstance() method, which is used to create an instance of a type la late binding. This method has been overloaded numerous times to provide a good deal of flexibility. The simplest variation of the CreateInstance() member takes a valid Type object that describes the entity you wish to allocate into memory on the fly. Create a new Console Application named LateBindingApp, and import the System.IO and System.Reflection namespace via the C# using keyword. Now, update the Program class as follows: // This program will load an external library, // and create an object using late binding. public class Program { static void Main(string[] args) { Console.WriteLine("***** Fun with Late Binding *****"); // Try to load a local copy of CarLibrary. Assembly a = null; try { a = Assembly.Load("CarLibrary"); } catch(FileNotFoundException ex) { Console.WriteLine(ex.Message); return; } if(a != null) CreateUsingLateBinding(a); Console.ReadLine(); } static void CreateUsingLateBinding(Assembly asm) { try { // Get metadata for the Minivan type. Type miniVan = asm.GetType("CarLibrary.MiniVan"); // Create the Minivan on the fly. object obj = Activator.CreateInstance(miniVan); Console.WriteLine("Created a {0} using late binding!", obj); } catch(Exception ex) { Console.WriteLine(ex.Message); } } }

<div>Age: <b><%: Model.Age %></b></div> <div>Hobbies: <b><%: Model.Hobbies %></b></div> <p> <input type="submit" name="backButton" value="< Back" /> <input type="submit" name="nextButton" value="Next >" /> </p> <% } %> Of course, you could instead display the data simply using Html.DisplayForModel() if you prefer. You might need to add extra display metadata or a custom display template, as described in the previous chapter, to get an acceptable result. Then it s finished: you ve got a wizard that navigates backward and forward, preserving field data, with a confirm screen and a (very) basic finished screen (see Figure 13 4).

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Now, before you run this application, you will need to manually place a copy of CarLibrary.dll into the bin\Debug folder of this new application using Windows Explorer. The reason is that you are calling Assembly.Load(), therefore the CLR will only probe in the client folder (if you wish, you could enter a path to the assembly using Assembly.LoadFrom(), however there is no need to do so) .

Note Don t set a reference to CarLibrary.dll using Visual Studio for this example! That will record this library in the client s manifest. The whole point of late binding is that you are trying to create an object which is not known at compile time.

You might noticethat this example doesn t validate any of the data that s entered. No problem you can use any of the validation techniques discussed in the previous chapter. For example, you can add the following Data Annotations attributes1 to RegistrationData. [Serializable] public class RegistrationData { [Required] public string Name { get; set; } [Required] public string Email { get; set; } [Required, Range(0, 200)] public int Age { get; set; } public string Hobbies { get; set; } } Then make sure each wizard step prevents the user from moving forward when model binding reports problems. To do this, alter BasicDetails() and ExtraDetails() as follows: public ActionResult BasicDetails(string nextButton) { if ((nextButton != null) && ModelState.IsValid) { return RedirectToAction("ExtraDetails"); } return View(regData); } public ActionResult ExtraDetails(string backButton, string nextButton) { if (backButton != null) return RedirectToAction("BasicDetails"); else if ((nextButton != null) && ModelState.IsValid) return RedirectToAction("Confirm"); else return View(regData); } Since your view templates already contain a call to Html.ValidationSummary(), any detected errors will be displayed in a bulleted list. However, as shown in Figure 13 5, there s now a little glitch: users can t move on from step 1 until they ve populated fields that don t appear until step 2!

fieldset fieldset legend { font-size: 1.2em; } Here, we ve adjusted the margin on nested fieldset elements, given them a different background color, and also made their labels a bit smaller (Figure 11-8).

Notice that the Activator.CreateInstance() method returns a System.Object rather than a strongly typed MiniVan. Therefore, if you apply the dot operator on the obj variable, you will fail to see any members of the MiniVan class. At first glance, you may assume you can remedy this problem with an explicit cast: // Cast to get access to the members of MiniVan // Nope! Compiler error! object obj = (MiniVan)Activator.CreateInstance(minivan); However, because your program has not set a reference to CarLibrary.dll, you cannot make use of the C# using keyword to import the CarLibrary namespace, and therefore you can t use a MiniVan during the casting operation! Remember that the whole point of late binding is to create instances of objects for which there is no compile-time knowledge. Given this, how can you invoke the underlying methods of the MiniVan object stored in the System.Object reference The answer, of course, is by using reflection.

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