我正在委托和事件处理程序中获得速成课程，我一直在学习有关该主题的教程，并尝试将我学到的内容插入到我正在创建的套接字服务器程序中。
我试图将我的服务器与在此处了解AlertConnectionOpened类分开：
namespace AlertConnectionOpened
{
//This is a subscriber class
public class AlertConnectionOpened
{
public void OnConnectionOpened(string message)
{
Console.WriteLine("Connection is opened");
}
}
}
所以我在服务器类中使用委托来完成此任务。
namespace Server
{
public class RunServer
{
// State object for reading client data asynchronously
public class StateObject
{
// Client socket.
public Socket workSocket = null;
// Size of receive buffer.
public const int BufferSize = 1024;
// Receive buffer.
public byte[] buffer = new byte[BufferSize];
// Received data string.
public StringBuilder sb = new StringBuilder();
}
public class AsynchronousSocketListener
{
// Thread signal.
public ManualResetEvent allDone = new ManualResetEvent(false);
public AsynchronousSocketListener(int port)
{
}
//This defines the delegate
//Agreement between publisher and subscriber
//object, source of event or class publishing or sending data,
//second param is any additional data we need to send.
public delegate void ConnectionOpenEventHandler(string Message);
//Indicates something has happened and finished.
//Event defined here, based on delegate
public event ConnectionOpenEventHandler ConnectionOpened;
//Raise the Event, need a method to do this.
//Responsible for notifying subscribers
protected virtual void OnConnectionOpened()
{
if (ConnectionOpened != null)
ConnectionOpened("Connection Opened");
}
public void StartListening()
{
// Data buffer for incoming data.
byte[] bytes = new Byte[1024];
int port = 11000;
// Establish the local endpoint for the socket.
// The DNS name of the computer
// running the listener is "host.contoso.com".
IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
IPAddress ipAddress = ipHostInfo.AddressList[0];
IPEndPoint localEndPoint = new IPEndPoint(ipAddress, port);
// Create a TCP/IP socket.
Socket listener = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
// Bind the socket to the local endpoint and listen for incoming connections.
try
{
listener.Bind(localEndPoint);
//backlog of how many clients to take in
listener.Listen(100);
while (true)
{
// Set the event to nonsignaled state.
allDone.Reset();
// Start an asynchronous socket to listen for connections.
Console.WriteLine("Waiting for a connection...");
listener.BeginAccept(
new AsyncCallback(AcceptCallback),
listener);
// Wait until a connection is made before continuing.
allDone.WaitOne();
OnConnectionOpened();
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
Console.WriteLine("\nPress ENTER to continue...");
Console.Read();
}
public void AcceptCallback(IAsyncResult ar)
{
// Signal the main thread to continue.
allDone.Set();
// Get the socket that handles the client request.
Socket listener = (Socket)ar.AsyncState;
Socket handler = listener.EndAccept(ar);
// Create the state object.
StateObject state = new StateObject();
state.workSocket = handler;
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
}
public void ReadCallback(IAsyncResult ar)
{
String content = String.Empty;
// Retrieve the state object and the handler socket
// from the asynchronous state object.
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.workSocket;
// Read data from the client socket.
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
// There might be more data, so store the data received so far.
state.sb.Append(Encoding.ASCII.GetString(
state.buffer, 0, bytesRead));
// Check for end-of-file tag. If it is not there, read
// more data.
content = state.sb.ToString();
if (content.IndexOf("<EOF>") > -1)
{
// All the data has been read from the
// client. Display it on the console.
Console.WriteLine("Read {0} bytes from socket. \n Data : {1}",
content.Length, content);
Random rand = new Random();
content = rand.ToString();
// Echo the data back to the client.
Send(handler, content);
}
else {
// Not all data received. Get more.
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
}
}
}
public void Send(Socket handler, String data)
{
// Convert the string data to byte data using ASCII encoding.
byte[] byteData = Encoding.ASCII.GetBytes(data);
// Begin sending the data to the remote device.
handler.BeginSend(byteData, 0, byteData.Length, 0,
new AsyncCallback(SendCallback), handler);
}
public void SendCallback(IAsyncResult ar)
{
try
{
// Retrieve the socket from the state object.
Socket handler = (Socket)ar.AsyncState;
// Complete sending the data to the remote device.
int bytesSent = handler.EndSend(ar);
Console.WriteLine("Sent {0} bytes to client.", bytesSent);
handler.Shutdown(SocketShutdown.Both);
handler.Close();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
public static int Main(String[] args)
{
AsynchronousSocketListener a = new AsynchronousSocketListener(0);
a.StartListening();
return 0;
}
}
}
}
这也是我的主要计划：
namespace AppStart
{
class ServerStart
{
static void Main(string[] args)
{
RunServer.AsynchronousSocketListener svr1 = new RunServer.AsynchronousSocketListener(11000);//publisher
//Correct the port number so a second server can open
RunServer.AsynchronousSocketListener svr2 = new RunServer.AsynchronousSocketListener(350);
svr1.StartListening();//publisher
//This creates the subscriber
var alertConnectionOpened = new AlertConnectionOpened.AlertConnectionOpened();//subsciber
//make publisher register the handler for the event.
svr1.ConnectionOpened += alertConnectionOpened.OnConnectionOpened; //POinter to method
svr2.StartListening();
Console.ReadLine();
}
}
}
从我对此的了解，我对OnConnectionOpened（）;的调用，应该显示现在有连接的消息，但事实并非如此。