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The .NET Framework class library is big. To make it easier to find your way around the many services it offers, the library is split into namespaces. For example, the System.IO namespace offers I/O (Input/Output) services such as working with files on disk, while System.Data.SqlClient is for connecting to a SQL Server database. A namespace contains types. A type typically represents either a kind of information or a kind of object. For example, there are types that provide the core forms of information used in all programs, such as System.String which represents text, or the various numeric types such as System.Double or System.Int32. Some types are more complex for example, the System.Net.HttpWebRequest class represents an HTTP request to be sent to a web server. A few types do not represent any particular thing, but simply offer a set of services, such as the System.Math class, which provides mathematical functions such as Sin and Log, and constants such as or the base of natural logarithms, e. (We will explore the nature of types, objects, and values in much more detail in the next chapter.) All types in the .NET Framework class library belong to a namespace. The purpose of a using directive is to save you from typing the namespace every single time you need to use a class. For example, in a file that has a using System; directive you can just write Math.PI to get the value of , instead of using the full name, System.Math.PI. You re not required to write using directives, by the way if you happen to enjoy typing, you re free to use the fully qualified name. But since some namespaces get quite long for example, System.Windows.Media.Imaging you can see how the shorthand enabled by a using directive can reduce clutter considerably. You might be wondering why namespaces are needed at all if the first thing we usually do is add a bunch of using directives to avoid having to mention the namespace
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anywhere else. One reason is disambiguation some type names crop up in multiple places. For example, the ASP.NET web framework has a type called Control, and so do both WPF and Windows Forms. They represent similar concepts, but they are used in completely different contexts (web applications versus Windows applications). Although all of these types are called Control, they are distinct thanks to being in different namespaces. This disambiguation also leaves you free to use whatever names you want in your own code even if some names happen to be used already in parts of the .NET class library you never knew existed. Since there are more than 10,000 types in the framework, it s entirely possible that you might pick a name that s already being used, but namespaces make this less of a problem. For example, there s a Bold class in .NET, but if you happen not to be using part of the library it belongs to (WPF s text services) you might well want to use the name Bold to mean something else in your own code. And since .NET s own Bold type is hidden away in the System.Windows.Documents namespace, as long as you don t add a using directive for that namespace you re free to use the name Bold yourself to mean whatever you like. Even when there s no ambiguity, namespaces help you find your way around the class library related types tend to be grouped into one namespace, or a group of related namespaces. (For example, there are various namespaces starting with System.Web containing types used in ASP.NET web applications.) So rather than searching through thousands of types for what you need, you can browse through the namespaces there are only a few hundred of those.
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You can see a complete list of .NET Framework class library namespaces, along with a short description of what each one is for, at http://msdn .microsoft.com/library/ms229335.
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Visual Studio adds four namespace directives to the Program.cs file in a new console project. The System namespace contains general-purpose services, including basic data types such as String, and various numeric types. It also contains the Console type our program uses to display its greeting and which provides other console-related services, such as reading keyboard input and choosing the color of your output text. The remaining three using directives aren t used in our example. Visual Studio adds them to newly created projects because they are likely to be useful in many applications. The System.Collections.Generic namespace contains types for working with collections of things, such as a list of numbers. The System.Linq namespace contains types used for LINQ, which provides convenient ways of processing collections of information in C#. And the System.Text namespace contains types useful for working with text. The using directives Visual Studio adds to a new C# file are there just to save you some typing. You are free to remove them if you happen not to be using those namespaces. And you can add more, of course.
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