如何編寫能夠監聽特定程序或全系統所有Http請求的.Net程序？

namespace WebProxy
{
internal class Proxy
{
private Socket clientSocket;
private Byte[] read = new byte[1024];
//定義一個空間，存儲來自客戶端請求數據包
private Byte[] Buffer = null;
private Encoding ASCII = Encoding.UTF8;
//設定編碼
private Byte[] RecvBytes = new Byte[4096];
//定義一個空間，存儲Web伺服器返回的數據

public Proxy(Socket socket)
{
clientSocket = socket;
}

public void Run()
{
try
{
string clientmessage = "";
//存放來自客戶端的HTTP請求字元串

int bytes = ReadMessage(read, ref clientSocket, ref clientmessage);
if (bytes == 0)
{
return;
}

//int index1 = clientmessage.IndexOf(" ");
//int index2 = clientmessage.IndexOf(" ", index1 + 1);
//if ((index1 == -1) || (index2 == -1))
//{
// throw new IOException();
//}
//string part1 = clientmessage.Substring(index1 + 1, index2 - index1);
//int index3 = part1.IndexOf("/", index1 + 8);
//int index4 = part1.IndexOf(" ", index1 + 8);
//int index5 = index4 - index3;
//_URL = part1.Substring(index1 + 4, (part1.Length - index5) - 8);

var url = new Regex(@"GETs+(S+)s+HTTP").Match(clientmessage).Groups[1].Value;
var host = new Regex(@"Host:s*([^s
]+)").Match(clientmessage).Groups[1].Value;
Console.WriteLine($"目標網址：{url} 主機：{host}");
try
{
IPHostEntry IPHost = Dns.Resolve(host);
Console.WriteLine("遠程主機名： " + IPHost.HostName);
string[] aliases = IPHost.Aliases;
IPAddress[] address = IPHost.AddressList;
Console.WriteLine("Web伺服器IP地址：" + address[0]);
//解析出要訪問的伺服器地址
IPEndPoint ipEndpoint = new IPEndPoint(address[0], 80);
Socket IPsocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
//創建連接Web伺服器端的Socket對象
IPsocket.Connect(ipEndpoint);
//Socket連Web接伺服器
if (IPsocket.Connected)
Console.WriteLine("Socket 正確連接！");
string GET = clientmessage;
Byte[] ByteGet = ASCII.GetBytes(GET);
IPsocket.Send(ByteGet, ByteGet.Length, 0);
//代理訪問軟體對伺服器端傳送HTTP請求命令
Int32 rBytes = IPsocket.Receive(RecvBytes, RecvBytes.Length, 0);
//代理訪問軟體接收來自Web伺服器端的反饋信息
Console.WriteLine("接收位元組數：" + rBytes.ToString());
String strRetPage = null;
strRetPage = ASCII.GetString(RecvBytes, 0, rBytes);
while (rBytes &> 0)
{
rBytes = IPsocket.Receive(RecvBytes, RecvBytes.Length, 0);
strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, rBytes);
}
IPsocket.Shutdown(SocketShutdown.Both);
IPsocket.Close();
SendMessage(clientSocket, strRetPage);
//代理服務軟體往客戶端傳送接收到的信息
}
catch (Exception exc2)
{
Console.WriteLine(exc2.ToString());
}
}
catch (Exception te)
{
Console.WriteLine(te);
}
}

//接收客戶端的HTTP請求數據
private int ReadMessage(byte[] ByteArray, ref Socket s, ref String clientmessage)
{
int bytes = s.Receive(ByteArray, 1024, 0);
string messagefromclient = Encoding.ASCII.GetString(ByteArray);
clientmessage = (String)messagefromclient;
return bytes;
}