cs11dotnet7/vscode/Chapter08/WorkingWithNetworkResources/Program.cs

using System.Net; // IPHostEntry, Dns, IPAddress
using System.Net.NetworkInformation; // Ping, PingReply, IPStatus

// Working with URIs, DNS, and IP addresses

Write("Enter a valid web address (or press Enter): ");
string? url = ReadLine();

if (string.IsNullOrWhiteSpace(url)) // if they enter nothing...
{
  // ... set a default URL
  url = "https://stackoverflow.com/search?q=securestring";
}

Uri uri = new(url);
WriteLine($"URL: {url}");
WriteLine($"Scheme: {uri.Scheme}");
WriteLine($"Port: {uri.Port}");
WriteLine($"Host: {uri.Host}");
WriteLine($"Path: {uri.AbsolutePath}");
WriteLine($"Query: {uri.Query}");

IPHostEntry entry = Dns.GetHostEntry(uri.Host);
WriteLine($"{entry.HostName} has the following IP addresses:");
foreach (IPAddress address in entry.AddressList)
{
  WriteLine($"  {address} ({address.AddressFamily})");
}

// Pinging a server

try
{
  Ping ping = new();

  WriteLine("Pinging server. Please wait...");
  PingReply reply = ping.Send(uri.Host);
  WriteLine($"{uri.Host} was pinged and replied: {reply.Status}.");

  if (reply.Status == IPStatus.Success)
  {
    WriteLine("Reply from {0} took {1:N0}ms",
      arg0: reply.Address,
      arg1: reply.RoundtripTime);
  }
}
catch (Exception ex)
{
  WriteLine($"{ex.GetType().ToString()} says {ex.Message}");
}