Professional C# 7 and .NET Core 2.0, 7th Edition

23Networking

WHAT’S IN THIS CHAPTER?

• Using HttpClient
• Manipulating IP addresses and performing DNS lookups
• Creating a server with WebListener
• Socket programming with TCP, UDP, and socket classes

WROX.COM CODE DOWNLOADS FOR THIS CHAPTER

The Wrox.com code downloads for this chapter are found at http://www.wrox.com on the Download Code tab. The source code is also available at https://github.com/ProfessionalCSharp/ProfessionalCSharp7 in the directory Networking.

The code for this chapter is divided into the following major examples:

• HttpClientSample
• WinAppHttpClient
• HttpServer
• Utilities
• DnsLookup
• HttpClientUsingTcp
• TcpServer
• WinAppTcpClient
• UdpReceiver
• UdpSender
• SocketServer
• SocketClient

NETWORKING

This chapter takes a practical approach to networking, mixing examples with a discussion of relevant theory and networking concepts as appropriate. This chapter is not a guide to computer networking but an introduction to using the .NET for network communication.

This chapter shows you how to create both clients and servers using network protocols. It starts with the simplest case: sending an HTTP request to a server and storing the information that’s sent back in the response.

Then you see how to create an HTTP server, using utility classes to split up and create URIs and resolve hostnames to IP addresses. You are also introduced to sending and receiving data via TCP and UDP and find out how to make use of the Socket class.

The two namespaces of most interest for networking ...