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.NET Class Library In an earlier section, "Consistent programming models across programming languages," the .NET Class Library was described as containing hundreds of classes that model the system and services it provides. To make the .NET Class Library easier to work with and understand, it's divided into namespaces. The root namespace of the .NET Class Library is called System, and it contains core classes and data types, such as Int32, Object, Array, and Console. Secondary namespaces reside within the System namespace. Examples of nested namespaces include the following: System.Diagnostics: Contains classes for working with the Event Log System.Data: Makes it easy to work with data from multiple data sources (System.Data.OleDb resides within this namespace and contains the ADO.NET classes) System.IO: Contains classes for working with files and data streams Figure 1-2 illustrates the relationship between some of the major namespaces in the .NET Class Library.

class FibVL extends FJTask { volatile int number; // as before final FibVL next; // embedded linked list of sibling tasks FibVL(int n, FibVL list) { number = n; next = list; } public void run() { int n = number; if(n <= sequentialThreshold) number = seqFib(n); else { FibVL forked = null;

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When standardized interfaces are defined after designing one or more concrete classes, these classes often do not quite implement the desired interface For example, the names of their methods might be slightly different from those defined in the interface If you cannot modify these concrete classes to fix such problems, you can still obtain the desired effect by building an Adapter class that translates away the incompatibilities Say you have a Performer class that supports method perform and meets all the qualifications of being usable as a Runnable except for the name mismatch You can build an Adapter so it can be used in a thread by some other class:

Figure 1-2: Organization of the .NET Class Library The benefits of using the .NET Class Library include a consistent set of services available to all .NET languages and simplified deployment, because the .NET Class Library is available on all implementations of the .NET Framework. Unifying components Until this point, this chapter has covered the low-level components of the .NET Framework. The unifying components, listed next, are the means by which you can access the services the .NET Framework provides: ASP.NET

class AdaptedPerformer implements Runnable { private final Performer adaptee; public AdaptedPerformer(Performer p) { adaptee = p; } public void run() { adapteeperform(); } }

This is only one of many common contexts for building Adapters, which also form the basis of several related patterns presented in the Design Patterns book A Proxy is an Adapter with the same interface as its delegate A Composite maintains a collection of delegates, all supporting the same interface In this delegation-based style of composition, the publicly accessible host class forwards all methods to one or more delegates and relays back replies, perhaps doing some light translation (name changes, parameter coercion, result filtering, etc) surrounding the delegate calls Adapters can be used to provide before/after control merely by wrapping the delegated call within the control actions For example, assuming that we have an implementation class, say TankImpl, we can write the following AdaptedTank class This class can be used instead of the original in some application by replacing all occurrences of:

Developers not familiar with Web development can spend a great deal of time, for example, figuring out how to validate the e-mail address on a form. You can validate the information on a form by using a client-side script or a server-side script. Deciding which kind of script to use is complicated by the fact that each approach has its benefits and drawbacks, some of which aren't apparent unless you've done substantial design work. If you validate the form on the client by using client-side JScript code, you need to take into consideration the browser that your users may use to access the form. Not all browsers expose exactly the same representation of the document to programmatic interfaces. If you validate the form on the server, you need to be aware of the load that users might place on the server. The server has to validate the data and send the result back to the client. Web Forms simplify Web development to the point that it becomes as easy as dragging and dropping controls onto a designer (the surface that you use to edit a page) to design interactive Web applications that span from client to server.

new TankImpl()

with:

A Web service is an application that exposes a programmatic interface through standard access methods. Web Services are designed to be used by other applications and components and are not intended to be useful directly to human end users. Web Services make it easy to build applications that integrate features from remote sources. For example, you can write a Web Service that provides weather information for subscribers of your service instead of having subscribers link to a page or parse through a file they download from your site. Clients can simply call a method on your Web Service as if they are calling a method on a component installed on their system and have the weather information available in an easy-to-use format that they can integrate into their own applications or Web sites with no trouble.

new AdaptedTank(new TankImpl()) class AdaptedTank implements Tank { protected final Tank delegate; public AdaptedTank(Tank t) { delegate = t; } public float getCapacity() { return delegategetCapacity(); } public float getVolume() { return delegategetVolume(); }

protected void checkVolumeInvariant() throws AssertionError { float v = getVolume(); float c = getCapacity(); if ( !(v >= 00 && v <= c) ) throw new AssertionError(); } public synchronized void transferWater(float amount) throws OverflowException, UnderflowException { checkVolumeInvariant(); // before-check

Windows Forms is the name of a unified set of classes that provides support for creating traditional desktop applications applications that have a graphical user interface (GUI). Windows Forms make it easy to develop end-user applications using any .NET programming language. Furthermore, through Visual Studio .NET, developers can easily design forms by using drag-and-drop editing.

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