通过Socket套接字和NetWorkStream流进行网络传输

通过Socket套接字和NetWorkStream流进行网络传输，通过NetWork流来发出链接的要求字符串得到Google主页网站的源代码，利用Socket套接字来链接Google的服务器发送请求和接收数据完成网络传输功能，主要利用了Dns类获取IPAddress来建立链接，以后还有讲到利用TCP和UDP进行通信在封装了Socket类的基础上能够更容易的实现网络的通信。

源代码如下：using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.IO;
using System.Net;
using System.Net.Sockets;
namespace NetPortConsole
{
class Program
{
static void Main(string[] args)
{
string server;
IPAddress[] hostadd;
ShowIPAddressAll(out server, out hostadd);
Socket s = Connect(hostadd);
NetworkStream ns = new NetworkStream(s, FileAccess.ReadWrite);
byte[] request = Request(server, s, ns);
//利用套接字发送
s.Send(request, request.Length, SocketFlags.None);
Receive(s);
Console.ReadLine();
}
private static void Receive(Socket s)
{
int bytes;
byte[] RecBytes = new byte[256];
while ((bytes = s.Receive(RecBytes, RecBytes.Length, SocketFlags.None)) > 0){
Console.WriteLine(Encoding.Unicode.GetString(RecBytes, 0, bytes));
}
}

private static byte[] Request(string server, Socket s, NetworkStream ns){
//需要这样的格式
string opStr = "GET/HTTP/1.1 /r/n Host:" + server + "/r/nConnection:Close/r/n/r/n";
byte[] request = Encoding.Unicode.GetBytes(opStr);

ns.Write(request, 0, request.Length);
int nextByte;
while ((nextByte = ns.ReadByte()) != -1){
Console.Write((char)nextByte);
}
return request;
}

private static Socket Connect(IPAddress[] hostadd){
IPEndPoint iep = new IPEndPoint(hostadd[0], 80);
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
s.Connect(iep);
if (!s.Connected){Console.WriteLine("Unable to Connect to host");}
return s;
}
private static void ShowIPAddressAll(out string server, out IPAddress[] hostadd){
server = "www.google.com";
hostadd = (Dns.GetHostEntry(server)).AddressList;
Console.WriteLine("Ip Address for {0} are:", server);
for (int i = 0; i < hostadd.Length; i++){Console.WriteLine(hostadd[i].ToString());}
}
}
}