国外站点上转过来的资料，模拟ping程序

答案：namespace SaurabhPing
{
  using System;
  using System.Net;
  using System.Net.Sockets;
  /// <summary>
  ///        The Main Ping Class
  /// </summary>
  class Ping
  {
    //Declare some Constant Variables
    const int SOCKET_ERROR = -1;        
    const int ICMP_ECHO = 8;
    /// <summary>
    ///        The Starting Point of the Class
    ///        It Takes the Hostname parameter
    /// </summary>
    public static void Main(string[] argv)
    {
      if(argv.Length==0)
      {
    //If user did not enter any Parameter inform him
    Console.WriteLine("Usage:Ping <hostname> /r") ;
    Console.WriteLine("<hostname> The name of the Host who you want to ping");
    Console.WriteLine("/r Ping the host continuously") ;
      }
      else if(argv.Length==1)
      {
    //Just the hostname provided by the user
    //call the method "PingHost" and pass the HostName as a parameter
    PingHost(argv[0]) ;
      }
      else if(argv.Length==2)
      {
    //the user provided the hostname and the switch
    if(argv[1]=="/r")
    {
      //loop the ping program
      while(true)
      {
        //call the method "PingHost" and pass the HostName as a parameter
        PingHost(argv[0]) ;
      }
        }
    else
    {
      //if the user provided some other switch
      PingHost(argv[0]) ;
     }
       }
       else
       {
     //Some error occurred
     Console.WriteLine("Error in Arguments") ;
        }
     }
        
      /// <summary>
      ///        This method takes the "hostname" of the server
      ///        and then it ping's it and shows the response time
      /// </summary>
      public static void PingHost(string host)
      {
    //Declare the IPHostEntry 
    IPHostEntry serverHE, fromHE;
    int nBytes = 0;
    int dwStart = 0, dwStop = 0;
    //Initilize a Socket of the Type ICMP
    Socket socket = 
    new Socket(AddressFamily.AfINet, SocketType.SockRaw, ProtocolType.ProtICMP);
    
    // Get the server endpoint
    try
    {
      serverHE = DNS.GetHostByName(host);    
    }
    catch(Exception)
    {
      Console.WriteLine("Host not found"); // fail
      return ;
    }

    // Convert the server IP_EndPoint to an EndPoint
    IPEndPoint ipepServer = new IPEndPoint(serverHE.AddressList[0], 0);
    EndPoint epServer = (ipepServer);    

    // Set the receiving endpoint to the client machine
    fromHE = DNS.GetHostByName(DNS.GetHostName());
    IPEndPoint ipEndPointFrom = new IPEndPoint(fromHE.AddressList[0], 0);        
    EndPoint EndPointFrom = (ipEndPointFrom);

    int PacketSize = 0;
    IcmpPacket packet = new IcmpPacket();
    // Construct the packet to send
    packet.Type = ICMP_ECHO; //8
    packet.SubCode = 0;
    packet.CheckSum = UInt16.Parse("0");
    packet.Identifier   = UInt16.Parse("45"); 
    packet.SequenceNumber  = UInt16.Parse("0"); 
    int PingData = 32; // sizeof(IcmpPacket) - 8;
    packet.Data = new Byte[PingData];
    //Initilize the Packet.Data
    for (int i = 0; i < PingData; i++)
    {
      packet.Data[i] = (byte)'#';
    }
                 
    //Variable to hold the total Packet size
    PacketSize = PingData + 8;
    Byte [] icmp_pkt_buffer = new Byte[ PacketSize ]; 
    Int32 Index = 0;
    //Call a Method Serialize which counts
    //The total number of Bytes in the Packet
    Index = Serialize(  
                      packet, 
                     icmp_pkt_buffer, 
                      PacketSize, 
                       PingData );
    //Error in Packet Size
    if( Index == -1 )
    {
      Console.WriteLine("Error in Making Packet");
      return ;
    }
          
    // now get this critter into a UInt16 array
             
    //Get the Half size of the Packet
    Double double_length = Convert.ToDouble(Index);<

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