asp.net qr code generator open source Part II The Core of ASP.NET MVC in VB.NET

Printing QR-Code in VB.NET Part II The Core of ASP.NET MVC

Part II The Core of ASP.NET MVC
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Should You Use Your Own Base Class
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An aspect you might want to seriously consider when writing a controller class is adding an extra layer of common functionality in an intermediate controller class. You define your application-specific base controller class and inherit your working controllers from there. In this way, you can have available in all of your working controllers an additional set of properties. The question mark in the title of the section suggests that there might be situations in which an application-specific base controller class is not required. Frankly, I believe you should always have your own base class for any application of some complexity. How should you measure complexity here The number of requirements The frequency of requirements changes Complexity is a nebulous concept and, overall, something that is hard to describe but easy to recognize when you see it. As far as ASP.NET MVC is concerned, I d say that when you start having quite a few controllers, you might find it useful and more productive to move some common functionalities out to a superclass.
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Signature of a Controller SuperClass
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A firm point about the new superclass is that it will inherit from Controller. The following class definition doesn t really move any code around, but it creates an extra layer that adds flexibility to the whole solution:
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public class MyControllerSuperClass : Controller { }
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The next question is also the most critical what kind of functions would you add to the superclass The MyControllerSuperClass class creates a safe and clean environment for overriding some of the Controller virtual methods without mixing action methods and internal features. For example, you can override the ExecuteCore method of Controller to add logging capabilities:
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public class MyControllerSuperClass : Controller { // We should make the setter internal and provide for it during the construction // of the controller. However, this is not possible unless we set up a custom // controller factory. We'll see how to do that in 11. public ILogger Logger { get; set; } protected override void ExecuteCore() { // Capture the name of the action being executed. string action = this.RouteData.GetRequiredString("action");
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4 Inside Controllers
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// Log before executing if (Logger != null) { Logger.Log("Executing [{0}] action at {1}", action, DateTime.Now.ToString()); } // Execute as usual base.ExecuteCore(); // Log after execution if (Logger != null) { Logger.Log("Executed [{0}] action at {1}", action, DateTime.Now.ToString()); } } }
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The MyControllerSuperClass superclass now features an additional member Logger of a custom type ILogger:
public interface ILogger { void Log(string format, params object[] args); }
MyControllerSuperClass now has a dependency on the ILogger type, which is a good thing. It would have been much worse if MyControllerSuperClass retained a dependency on an actual implementation of ILogger. In the preceding code, MyControllerSuperClass injected a member of type ILogger as an external dependency. This is a great achievement for testability. The preceding code doesn t show how the Logger property initialized and when. I briefly hinted at dependency injection, but dependency injection is the means. It doesn t say much about the time at which injection can occur. I ll get back to this point in a moment. Let s see a couple of other features you can easily stuff in a controller superclass, such as exception handling and your own policy for unknown actions. Note Dependency injection (DI) is simply a pattern according to which a class exposes injection points for external callers to pass it references to specific objects. Common injection points are the constructor of the class, a public property, or perhaps the signature of a method. This is what dependency injection is all about. It turns out that any code required to retrieve and instantiate external objects pertains to the caller. And it is fairly repetitive code. This is where Inversion of Control (IoC) frameworks kick in. They essentially automate the implementation of the DI pattern. We could even say that IoC frameworks are an idiom of DI.
As you might have figured out already, some really powerful code results from the integration of an IoC framework and a controller superclass.
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