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Of the five SOLID principles, Liskov s principle is probably the only one that should be taken literally, because it serves you a detailed list of dos and don ts and it isn t limit to being a generic guidance on design. The formulation of the principle couldn t be simpler. To some extent, it also seems a bit obvious: Subclasses should always be substitutable for their base classes. When a new class is derived from an existing one, it should always be possible to use the derived class in any place where the parent class is accepted. Wait a moment! Isn t this something you get out of the box with any object-oriented language Well, not exactly! What you really get from OOP is just the mere promise that derived classes can be used wherever their base class is accepted. However, OOP still lets you write hierarchies of classes where this basic requirement isn t met; hence, the principle.

The Page s Application property returns an instance of the HttpApplicationState class. This object is created when the first request is posted to an ASP.NET application and an Application_Start event fires in Global.asax. A single HttpApplicationState object is created for all the clients of an ASP.NET application on a Web server, but it isn t shared across a Web garden (an application hosted in multiple worker processes on the same multi-CPU machine) or a Web farm (an application hosted in multiple comZ puters on the same network).

Suppose you have a Rectangle class and a method that works with that. The method just receives a parameter of type Rectangle and, of course, it takes advantage of the logical contract this class exposes. For example, the Rectangle class exposes a Width and Height pair of properties that can be independently set. Suppose that after doing this, you then need to introduce a Square object. How would you do that Logically speaking, you see the Square entity as a special case of the Rectangle entity. Therefore, the natural step is deriving Square from Rectangle and overriding Width and Height so that their values are always in sync. If you do this, you potentially break the original code written against the contract of the Rectangle class. The violation of the principle here doesn t necessarily result in a run-time exception or a compile error. Your code might still work just fine, despite the Liskov violation. However, your code is inherently fragile because there s the possibility of introducing bugs during maintenance. The violation has to be considered in the mathematical sense you can find a counterexample that shows you can t use a Square where a Rectangle is expected. Here s a code snippet that illustrates this point:

Part VI:

public class Rectangle { public virtual Int32 Width { get; set; } public virtual Int32 Height { get; set; } } public class Square : Rectangle { public override Int32 Width { get {return base.Width; } set {base.Width = value; base.Height = value; } } public override Int32 Height { get {return base.Height; } set {base.Height = value; base.Width = value; } } }

3 4 5

Here s some client code that consumes the Rectangle class:

You use this object in the same way that you use the Session object, except that application variables are shared between all clients of the application. You should use these variables only for data that doesn t change often after the application has been created. In a differZ ence from the way you use session variables, you must lock the Application object before accessing its variables, and you must unlock the object when you re done with them:

public void Process(Rectangle rect) { rect.Width = 100; rect.Height = 2* rect.Width; Debug.Assert(rect.Height == 2*rect.Width); }

Application.Lock()

This code works fine if a real Rectangle is passed, but it violates the assertion if a Square is passed. The easiest way to fix it the workaround that increases viscosity is simply the following:

Application( items ) = CInt(Application( items )) + CInt(Application( newitems ))

public void Process(Rectangle rect) { if (rect is Rectangle) { rect.Width = 100; rect.Height = 2* rect.Width; Debug.Assert(rect.Height == 2*rect.Width); } else { ... } }

Application.Unlock()