C # Get LAN host list Instance _c# tutorial

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>
Summary description of the Form1.
</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>
The required designer variable.
</summary>
Private System.ComponentModel.Container components = null;

Public Form1 ()
{
//
Required for Windows Forms Designer support
//
InitializeComponent ();
Initlanhost ();
Progressbarsearch.maximum = 255;

//
TODO: Add any constructor code after the InitializeComponent call
//
}

<summary>
Array initialization
</summary>
private void Initlanhost ()
{
Lanhost = new string[255,2];
for (int i=0;i<255;i++)
{
lanhost[i,0] = "";
lanhost[i,1] = "";
}
}

<summary>
Clean up all resources that are in use.
</summary>
protected override void Dispose (bool disposing)
{
if (disposing)
{
if (Components!= null)
{
Components. Dispose ();
}
}
Base. Dispose (disposing);
}

Code generated #region the Windows forms Designer
<summary>
Designer supports required methods-do not use the Code editor to modify
The contents of this method.
</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 = "Start Search";
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>
The main entry point for the application.
</summary>
[STAThread]
static void Main ()
{
Application.Run (New Form1 ());
}
private void Button1_Click (object sender, System.EventArgs e)
{

Lansearch ();

}
<summary>
LAN Search Events
</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 (); Local Host IP Address
str = localhost. Substring (0,localhost. LastIndexOf ("."));

for (int i=0;i<255;i++)//Create 255 threads scan IP
{
Threadmethod = new ThreadStart (Lansearchthreadmethod);
Thread[i] = new Thread (Threadmethod);
Thread[i]. Name = i.ToString ();
Thread[i]. Start ();
if (!thread[i). Join (M))//thread.join (100) I don't know if this is the right thing to do, it doesn't feel good.
{
Thread[i]. Abort ();
}
}

Getlanhost ();
Listlanhost ();
}
<summary>
Multi-Threaded Search method
</summary>
private void Lansearchthreadmethod ()
{
int currently_i = convert.touint16 (Thread.CurrentThread.Name); Current process Name

IPAddress Scanip = ipaddress.parse (str + ".")  +convert.tostring (currently_i + 1)); Get Scan IP Address
Iphostentry scanhost = null;
Scanhost = dns.gethostbyaddress (Scanip); Get scan IP Address host information

if (scanhost!= null)
{
lanhost[currently_i,0] = scanip.tostring ();
lanhost[currently_i,1] = Scanhost.hostname;
}

Progressbarsearch.value = Progressbarsearch.value +1;

}
<summary>
text box displays host name and IP list
</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 Display Search Host
</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>
Progress bar Processing Thread
</summary>
private void Progresssearch ()
{
Label1. Text = "Progress bar is only time estimate, not real search progress!" ";
Progressbarsearch.value = 0;
for (int i=0;i<255;i++)
{
Progressbarsearch.value = Progressbarsearch.value + 1;
Thread.Sleep (100);
}
}
}
}

Regret: Due to slow search, no real search progress has been achieved.
Do not understand: When implementing text prompts, when the mouse event in the end of the insertion
private void Button1_Click (object sender, System.EventArgs e)
{
Lab1.      Text = "Start Search"; New insert
Lansearch ();
Lab1.     Text = "End Search"; New insert
}
When the text is prompted, the LAB1 is never displayed in time, but the end search is not displayed until all threads are finished.