.NET provides
many classes to help make network programming easier and more
accessible than many environments that preceded it. There is a great
deal of functionality to assist you in building
“web-aware” applications;
performing simple tasks like downloading files, sending and receiving
HTTP requests, and writing TCP/IP clients and servers. In areas where
Microsoft had not provided a direct managed way to access networking
functionality (like named pipes), there is always P/Invoke to allow
you to perform networking actions via the Win32 API, which
we’ll show you in this chapter. With all of the
functionality at your disposal in the
System.Networking
namespace,
you’ll be writing web utilities in no time.
Use the Dns.Resolve
method to get the hostname for an IP address. In the following code,
an IP address is passed resolved, and the hostname is printed to the
console:
using System; using System.Net; //... // use the Dnss class to resolve the address IPHostEntry iphost = Dns.Resolve("127.0.0.1"); // HostName property holds the hostname string hostName = iphost.HostName;
The System.Net.Dns
class is provided for simple
DNS resolution functionality. The Resolve
method
returns an IPHostEntry
that can be used to access
the hostname via the HostName
property.