又要来砸分求助高手了，很简单的一段异步代码，哪位高手帮我运行下啊，为什么点完启动点停止就会有那些异常啊
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace AsyncServerWin
{
public partial class Form1 : Form
{
int num = 0;
EventWaitHandle ewh = new EventWaitHandle(false, EventResetMode.ManualReset);
TcpListener tl = new TcpListener(IPAddress.Any, 9876);
public Form1()
{
InitializeComponent();
}
public void BeginListen()
{
try
{
tl.Start();
AsyncCallback ac = new AsyncCallback(MyAcceptTcpClient);
while (true)
{
ewh.Reset();
tl.BeginAcceptTcpClient(ac, tl);
ewh.WaitOne();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
tl.Stop();
}
}
private void button1_Click(object sender, EventArgs e)
{
this.button1.Enabled = false;
Thread t = new Thread(BeginListen);
t.Start();
}
public void MyAcceptTcpClient(IAsyncResult ar)
{
try
{
ewh.Set();
TcpListener tl = (TcpListener)ar.AsyncState;
TcpClient tc = tl.EndAcceptTcpClient(ar);
num++;
lbConnectionID.Items.Add(((int)tc.Client.Handle).ToString());
tbNum.Text = num.ToString();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
tl.Stop();
}
}
private void button2_Click(object sender, EventArgs e)
{
tl.Stop();//---------------------------------------------------这里出问题了！！！
this.button1.Enabled = true;
}
}
}
================================================================================
namespace AsyncServerWin
{
partial class Form1
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.tbNum = new System.Windows.Forms.TextBox();
this.lbConnectionID = new System.Windows.Forms.ListBox();
this.button2 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(167, 51);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 0;
this.button1.Text = "启动";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// tbNum
//
this.tbNum.Location = new System.Drawing.Point(167, 133);
this.tbNum.Name = "tbNum";
this.tbNum.Size = new System.Drawing.Size(100, 21);
this.tbNum.TabIndex = 1;
//
// lbConnectionID
//
this.lbConnectionID.FormattingEnabled = true;
this.lbConnectionID.ItemHeight = 12;
this.lbConnectionID.Location = new System.Drawing.Point(29, 133);
this.lbConnectionID.Name = "lbConnectionID";
this.lbConnectionID.ScrollAlwaysVisible = true;
this.lbConnectionID.Size = new System.Drawing.Size(120, 88);
this.lbConnectionID.TabIndex = 2;
//
// button2
//
this.button2.Location = new System.Drawing.Point(167, 198);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(75, 23);
this.button2.TabIndex = 3;
this.button2.Text = "停止";
this.button2.UseVisualStyleBackColor = true;
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.button2);
this.Controls.Add(this.lbConnectionID);
this.Controls.Add(this.tbNum);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.Button button1;
private System.Windows.Forms.TextBox tbNum;
private System.Windows.Forms.ListBox lbConnectionID;
private System.Windows.Forms.Button button2;
}
}
[解决办法]
你可以添加个状态变量,
bool listenerrunning;
修改下
private void button2_Click(object sender, EventArgs e)
{
listenerrunning=false;
}
再修改下
public void MyAcceptTcpClient(IAsyncResult ar)
{
try
{
ewh.Set();
if(listenerrunning)
{
TcpListener tl = (TcpListener)ar.AsyncState;
TcpClient tc = tl.EndAcceptTcpClient(ar);
num++;
lbConnectionID.Items.Add(((int)tc.Client.Handle).ToString());
tbNum.Text = num.ToString();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
tl.Stop();
}
}
