試圖在WinForms中實現異步客戶端/服務器應用程序。客戶方代碼如下:AsyncCallback未觸發
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace AsyncClient
{
public partial class AsyncClient : Form
{
public AsyncClient()
{
InitializeComponent();
}
//ManualResetEvent for notifying asyncronous threads that an event has occured
private static ManualResetEvent connectDone = new ManualResetEvent(false);
private static ManualResetEvent sendDone = new ManualResetEvent(false);
private static ManualResetEvent receiveDone = new ManualResetEvent(false);
//Response from the remote device (server)
private static String response = String.Empty;
//start client
private void button1_Click(object sender, EventArgs e)
{
TcpClient clientSocket = new TcpClient();
try
{
var message = System.Text.Encoding.UTF8.GetBytes(txtFromClient.Text); //convert message to bytes for sending over the wire
using (clientSocket)/*(var clientSocket = new TcpClient("127.0.0.1", 1234)) *///make connection with the host
{
clientSocket.BeginConnect(IPAddress.Loopback, 1234, new AsyncCallback(connectCallBack), clientSocket);
sendDone.WaitOne();
lblConnectionStatus.Text = "Connect is successfully established with the remote device.";
//send data to remote device
NetworkStream stream = clientSocket.GetStream(); //obtain network stream
stream.Write(message, 0, message.Length); //send data to the remote device
//sendDone.WaitOne();
}
}
finally
{
clientSocket.Close();
}
}
private static void connectCallBack(IAsyncResult ar)
{
try
{
var clientSocket = (TcpClient)ar.AsyncState; //retrieve socket from state object (IAsyncResult)
clientSocket.EndConnect(ar); //complete the connection
connectDone.Set();
}
finally
{
}
}
private void txtFromClient_Click(object sender, EventArgs e)
{
txtFromClient.Text = "";
}
}
}
當我button1
發送文本,UI被凍結。在dubug模式我發現,在一行AsyncCallback(connectCallBack)
clientSocket.BeginConnect(IPAddress.Loopback, 1234, new AsyncCallback(connectCallBack), clientSocket);
不點火,因此沒有被執行connectCallBack
。程序停止在線
sendDone.WaitOne();
任何想法爲什麼?有人可以幫忙嗎?
檢查[這](https://social.msdn.microsoft.com/論壇/ vstudio/en-US/c359edfb-b6d9-4a21-bd82-ebbd2901d7e9/manualreseteventwaitone-hangs-my-application?forum = netfxbcl) – Kilazur