using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Net;
using System.Threading;

namespace WindowLanSearch
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Button button1;
private string[,] LanHost;
private System.Windows.Forms.ProgressBar progressBarSearch;
private Thread[] thread;
private System.Windows.Forms.ListView listView1;
private System.Windows.Forms.ColumnHeader columnHeader1;
private System.Windows.Forms.ColumnHeader columnHeader2;
private string str;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();
InitLanHost();
progressBarSearch.Maximum = 255;

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 数组初始化
/// </summary>
private void InitLanHost()
{
LanHost = new string[255,2];
for (int i=0;i<255;i++)
{
LanHost[i,0] = "";
LanHost[i,1] = "";
}
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (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.textBox1 = new System.Windows.Forms.TextBox();
this.button1 = new System.Windows.Forms.Button();
this.progressBarSearch = new System.Windows.Forms.ProgressBar();
this.listView1 = new System.Windows.Forms.ListView();
this.columnHeader1 = new System.Windows.Forms.ColumnHeader();
this.columnHeader2 = new System.Windows.Forms.ColumnHeader();
this.SuspendLayout();
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(24, 40);
this.textBox1.Multiline = true;
this.textBox1.Name = "textBox1";
this.textBox1.ScrollBars = System.Windows.Forms.ScrollBars.Both;
this.textBox1.Size = new System.Drawing.Size(176, 296);
this.textBox1.TabIndex = 0;
this.textBox1.Text = "";
//
// button1
//
this.button1.Location = new System.Drawing.Point(456, 40);
this.button1.Name = "button1";
this.button1.TabIndex = 1;
this.button1.Text = "开始搜索";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// progressBarSearch
//
this.progressBarSearch.Location = new System.Drawing.Point(32, 360);
this.progressBarSearch.Name = "progressBarSearch";
this.progressBarSearch.Size = new System.Drawing.Size(490, 24);
this.progressBarSearch.TabIndex = 2;
//
// listView1
//
this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {
this.columnHeader1,
this.columnHeader2});
this.listView1.Location = new System.Drawing.Point(248, 40);
this.listView1.Name = "listView1";
this.listView1.Size = new System.Drawing.Size(184, 288);
this.listView1.TabIndex = 5;
//
// columnHeader1
//
this.columnHeader1.Text = "dddd";
//
// columnHeader2
//
this.columnHeader2.Text = "sssss";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(544, 413);
this.Controls.Add(this.listView1);
this.Controls.Add(this.progressBarSearch);
this.Controls.Add(this.button1);
this.Controls.Add(this.textBox1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void button1_Click(object sender, System.EventArgs e)
{

LanSearch();

}
/// <summary>
/// 局域网搜索事件
/// </summary>
private void LanSearch()
{
thread = new Thread[255];

ThreadStart threadMethod;

Thread threadProgress = new Thread(new ThreadStart(progressSearch));
threadProgress.Start();

string localhost = (Dns.GetHostByName(Dns.GetHostName())).AddressList[0].ToString(); //本地主机IP地址
str = localhost.Substring(0,localhost.LastIndexOf("."));

for (int i=0;i<255;i++) //建立255个线程扫描IP
{
threadMethod = new ThreadStart(LanSearchThreadMethod);
thread[i] = new Thread(threadMethod);
thread[i].Name = i.ToString();
thread[i].Start();
if (!thread[i].Join(100)) //Thread.Join(100)不知道这处这么用对不对，感觉没什么效果一样
{
thread[i].Abort();
}
}

GetLanHost();
listLanHost();
}
/// <summary>
/// 多线程搜索方法
/// </summary>
private void LanSearchThreadMethod()
{
int Currently_i = Convert.ToUInt16(Thread.CurrentThread.Name); //当前进程名称

IPAddress ScanIP = IPAddress.Parse( str + "."+Convert.ToString(Currently_i +1)); //获得扫描IP地址
IPHostEntry ScanHost = null;
ScanHost = Dns.GetHostByAddress(ScanIP); //获得扫描IP地址主机信息

if (ScanHost != null)
{
LanHost[Currently_i,0] = ScanIP.ToString();
LanHost[Currently_i,1] = ScanHost.HostName;
}

//progressBarSearch.Value = progressBarSearch.Value +1;

}
/// <summary>
/// 文本框显示主机名与IP列表
/// </summary>
private void GetLanHost()
{
for (int i=0;i<255;i++)
if ( LanHost[i,0] !="")
{
textBox1.Text =textBox1.Text + LanHost[i,1] +":" +LanHost[i,0] + "\r\n";
}
}
/// <summary>
/// listview1 显示搜索主机
/// </summary>
private void listLanHost()
{
listView1.View = View.List;

ListViewItem aa ;
for (int i=0;i<255;i++)
{
if ( LanHost[i,0] !="")
{
aa= new ListViewItem();
aa.Text = LanHost[i,1];
aa.Tag = LanHost[i,0];
listView1.Items.Add(aa);
}
}

}
/// <summary>
/// 进度条处理线程
/// </summary>
private void progressSearch()
{
//label1.Text = "进度条只是时间估计，不是真实搜索进度！";
progressBarSearch.Value = 0;
for (int i=0;i<255;i++)
{
progressBarSearch.Value = progressBarSearch.Value + 1;
Thread.Sleep(100);
}
}
}
}

遗憾之处：因搜索较慢，没有实现真实的搜索进度。
不懂之处：实现文字提示时，当在鼠标事件首尾插入
private void button1_Click(object sender, System.EventArgs e)
{
lab1.Text = “开始搜索”; //新插入
LanSearch();
lab1.Text = “结束搜索”; //新插入
}
文本提示时，在lab1上始终不能及时显示，而是等所有线程结束后才显示“结束搜索“。
初学winForm编程，太多的要学了。
望高手指点一二