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C# includes a feature called the collection initializer, which makes it easier to initialize certain collections Instead of having to explicitly call Add( ), you can specify a list of initializers when a collection is created When this is done, the compiler automatically calls Add( ) for you, using these values The syntax is similar to an array initialization Here is an example It creates a List<char> that is initialized with the characters C, A, E, B, D, and F
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List<char> lst = new List<char>() { 'C', 'A', 'E', 'B', 'D', 'F' };
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After this statement executes, lstCount will equal 6, because there are six initializers, and this foreach loop
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foreach(ch in lst) ConsoleWrite(ch + " ");
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When using a collection such as LinkedList<TKey, TValue> that stores key/value pairs, you will need to supply pairs of initializers, as shown here:
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SortedList<int, string> lst = new SortedList<int, string>() { {1, "One"}, {2, "Two" }, {3, "Three"} };
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The compiler passes each group of values as arguments to Add( ) Thus, the first pair of initializers is translated into a call to Add(1, One ) by the compiler Because the compiler automatically calls Add( ) to add initializers to a collection, collection initializers can be used only with collections that support a public implementation of Add( ) Therefore, collection initializers cannot be used with the Stack, Stack<T>, Queue, or Queue<T> collections because they don t support Add( ) You also can t use a collection initializer with a collection such as LinkedList<T>, which provides Add( ) as an explicit interface implementation
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CHAPTER
Networking Through the Internet Using SystemNet
# is a language designed for the modern computing environment, of which the Internet is, obviously, an important part A main design criteria for C# was, therefore, to include those features necessary for accessing the Internet Although earlier languages, such as C and C++, could be used to access the Internet, support serverside operations, download files, and obtain resources, the process was not as streamlined as most programmers would like C# remedies that situation Using standard features of C# and the NET Framework, it is easy to Internet-enable your applications and write other types of Internet-based code Networking support is contained in several namespaces defined by the NET Framework The primary namespace for networking is SystemNet It defines a large number of highlevel, easy-to-use classes that support the various types of operations common to the Internet Several namespaces nested under SystemNet are also provided For example, low-level networking control through sockets is found in SystemNetSockets Mail support is found in SystemNetMail Support for secure network streams is found in SystemNetSecurity Several other nested namespaces provide additional functionality Another important networking-related namespace is SystemWeb It (and its nested namespaces) supports ASPNET-based network applications Although the NET Framework offers great flexibility and many options for networking, for many applications, the functionality provided by SystemNet is a best choice It provides both convenience and ease-of-use For this reason, SystemNet is the namespace we will be using in this chapter
The SystemNet Members
SystemNet is a large namespace that contains many members It is far beyond the scope of this chapter to discuss them all or to discuss all aspects related to Internet programming (In fact, an entire book is needed to fully cover networking in detail) However, it is worthwhile to list the members of SystemNet so you have an idea of what is available for your use
Part II:
Exploring the C# Library
The classes defined by SystemNet are shown here:
AuthenticationManager Cookie CookieContainer CredentialCache DnsEndPoint DnsPermissionAttribute DownloadProgressChangedEventArgs EndPoint FileWebRequest FtpWebRequest HttpListener HttpListenerContext HttpListenerPrefixCollection HttpListenerResponse HttpWebRequest IPAddress IPEndPointCollection IrDAEndPoint OpenReadCompletedEventArgs ProtocolViolationException ServicePointManager SocketPermission TransportContext UploadFileCompletedEventArgs UploadStringCompletedEventArgs WebClient WebHeaderCollection WebPermissionAttribute WebRequest WebRequestMethodsFile WebRequestMethodsHttp WebUtility Authorization CookieCollection CookieException Dns DnsPermission DownloadDataCompletedEventArgs DownloadStringCompletedEventArgs EndpointPermission FileWebResponse FtpWebResponse HttpListenerBasicIdentity HttpListenerException HttpListenerRequest HttpVersion HttpWebResponse IPEndPoint IPHostEntry NetworkCredential OpenWriteCompletedEventArgs ServicePoint SocketAddress SocketPermissionAttribute UploadDataCompletedEventArgs UploadProgressChangedEventArgs UploadValuesCompletedEventArgs WebException WebPermission WebProxy WebRequestMethods WebRequestMethodsFtp WebResponse
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