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CHAPTER 21 NETWORKING & WCF
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new UdpReceiver().Start(); // create the UdpSender and send the messages new UdpSender().SendMessages(); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Compiling all three classes and running the UdpTest class produces the following results: Receiver: Waiting for a message Sender: sending message: 0 x 0 = Sender: sending message: 1 x 1 = Sender: sending message: 2 x 2 = Receiver: Message from 127.0.0.1 Receiver: Message is: 0 x 0 = 0 Receiver: Waiting for a message Receiver: Message from 127.0.0.1 Receiver: Message is: 1 x 1 = 1 Receiver: Waiting for a message Sender: sending message: 3 x 3 = Sender: sending message: 4 x 4 = Receiver: Message from 127.0.0.1 Receiver: Message is: 2 x 2 = 4 Receiver: Waiting for a message Receiver: Message from 127.0.0.1 Receiver: Message is: 3 x 3 = 9 Receiver: Waiting for a message Receiver: Message from 127.0.0.1 Receiver: Message is: 4 x 4 = 16 Receiver: Waiting for a message Press enter to finish
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0 1 4 on port 57636 on port 57636 9 16 on port 57636 on port 57636 on port 57636
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Tip You may be prompted by the Windows firewall when you first run this example. You should ensure that access to private networks in enabled, as shown in Figure 21-2.
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Using the Domain Name System
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The Domain Name System (DNS) is used to convert between user-friendly host names (such as www.microsoft.com) and IP addresses (such as 207.46.170.123). The System.Net.Dns class provides static methods that let you make queries of the DNS. Listing 21-18 provides a simple demonstration.
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CHAPTER 21 NETWORKING & WCF
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Listing 21-18. Using the Dns Class using System; using System.Net; class Listing 18 { static void Main(string[] args) { // perform a DNS lookup on www.microsoft.com IPHostEntry myEntry = Dns.GetHostEntry("www.microsoft.com"); // print out the host name Console.WriteLine("Hostname: {0}", myEntry.HostName); // enumerate the addresses for this host foreach (IPAddress addr in myEntry.AddressList) { Console.WriteLine("Address: {0}", addr); } if (myEntry.Aliases.Length > 0) { // enumerate the strings for this host foreach (string str in myEntry.Aliases) { Console.WriteLine("Alias: {0}", str); } } else { Console.WriteLine("There are no aliases"); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The Dns class provides two methods, which are shown in Table 21-10. Table 21-10. Dns Methods
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Methods
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GetHostEntry(string)
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Description
Returns an IPHostEntry object representing the host name or IP address specified by the parameter. Returns the name of the local computer.
GetHostName()
The GetHostEntry method takes string parameter containing either a host name or an IP address and returns an IPHostEntry object that contains the details of the corresponding DNS record. The properties of the IPHostEntry class are described in Table 21-11.
CHAPTER 21 NETWORKING & WCF
Table 21-11. IPHostEntry Properties
Property
AddressList Aliases
Description
Returns an array of IPAddress objects. Returns an array of string values representing names that resolve to the IP addresses in the AddressList property. Returns a string representing the primary hostname
HostName
Compiling and running Listing 21-17 produces the information available for the hostname www.microsoft.com, which is as follows: Hostname: lb1.www.ms.akadns.net Address: 207.46.170.123 Address: 207.46.170.10 There are no aliases Press enter to finish You can see that the hostname belongs to Akamai, a company that provides content distribution services for high-traffic domains. Note that your results will almost certainly be different because content distribution networks (CDNs) localize their infrastructure to individual internet service providers.
Summary
In this chapter you looked at the .NET Framework class library facilities for networking. You learned how to use the WebClient class to retrieve data from HTTP servers, how to use the TcpListener, TcpClient, and UdpClient classes to perform connection-oriented and connectionless networking, how to use the Dns class to retrieve DNS information, and how to use the HttpListener class to create a simple web server. You also took a quick tour of the Windows Communications Foundation, which supports C# object and value semantics across networks something that requires a little more work, but makes the resulting program more robust and natural to work with.
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