多任務網段掃描

多任務網段掃描

--前臺界面設計部分

---使用動態佈局(優點:界面佈局清晰、控件會隨着窗口大小而改變)
    <Grid.RowDefinitions>
         <RowDefinition Height="1"></RowDefinition>
         <RowDefinition Height="auto"></RowDefinition>
         <RowDefinition Height="5"></RowDefinition>
    </Grid.RowDefinitions>

    <GroupBox Header="掃描的IP地址範圍" Grid.Row="0" Grid.RowSpan="3" FontSize="15px" Margin="0,2,0,-63">
         <Canvas Height="48" VerticalAlignment="Bottom">
              <Label Content="地址前綴:" Width="80" Canvas.Top="11"/>
              <TextBox x:Name="tb1" Height="25" Width="124"Canvas.Left="80" Canvas.Top="11" VerticalAlignment="Center" HorizontalAlignment="Center" />
              <Label Content="起始值:"  Width="63" Canvas.Top="11" Canvas.Left="209"/>
              <TextBox Name="tb2"  Height="25" Width="77" Canvas.Left="277" Canvas.Top="11" VerticalAlignment="Center" HorizontalAlignment="Center"/>
              <Label Content="終止值:" Width="58" RenderTransformOrigin="3.888,1.889" Canvas.Left="359" Canvas.Top="11"/>
              <TextBox Name="tb3" Height="25" Width="97" Canvas.Left="422" Canvas.Top="11" VerticalAlignment="Center" HorizontalAlignment="Center"/>
              <Button Name="btn1" Width="75" Content="開始掃描" Canvas.Left="542" Canvas.Top="10" Height="28" Click="btn1_Click"/>
              <Button Name="time_get" Width="93" Content="獲取總時間" Click="time_get_Click" Canvas.Left="622" Canvas.Top="10" Height="28"/>
          </Canvas>
     </GroupBox>
     <TextBlock Grid.Row="2" Name="textblock1" Margin="10,74,10,-103" FontSize="30"  Width="674" VerticalAlignment="Center" TextAlignment="Center"/>
     <GroupBox Header="掃描信息" Grid.Row="2" Margin="0,114,0,-340" FontSize="15px">
          <ListBox Margin="0,0,0,10" Name="listbox1">
          </ListBox>
     </GroupBox>

---後臺功能實現

---定義全局變量 所定義的時間變量sumTime必須爲長整形，若定義爲int，因爲掃面的時間可能太大會超出範圍
     long sumTime = 0;
     DateTime times = DateTime.Now;

---掃描線程的點擊事件
private void btn1_Click(object sender, RoutedEventArgs e)
{
    IPAddress ipStart;
    IPAddress ipStop;
    listbox1.Items.Clear();
    if (int.Parse(tb3.Text) < int.Parse(tb2.Text))
    {
          MessageBox.Show("提示:終止值必須大於起始值!");
          tb2.Text = "";
          tb3.Text = "";
    }
    try
    {
        textblock1.Text = null;
         textblock1.Background = Brushes.AliceBlue;
         ipStart = IPAddress.Parse(tb1.Text + tb2.Text);
         ipStop = IPAddress.Parse(tb1.Text + tb3.Text);
    }
    catch
    {
         textblock1.Background = Brushes.Red;
         textblock1.Foreground = Brushes.White;
         textblock1.Text = "IP地址有錯,請更正!";
     }

     if (IPAddress.TryParse(tb1.Text + tb2.Text, out ipStart) && IPAddress.TryParse(tb1.Text + tb3.Text, out ipStop))
     {
            textblock1.Text = null;
            textblock1.Background = Brushes.AliceBlue;

            for (int i = int.Parse(tb2.Text); i <= int.Parse(tb3.Text); i++)
            {
                 IPAddress ip = IPAddress.Parse(tb1.Text + i.ToString());

                 /*  this.myMainTask(ip);*/ //非多線程（若採用多線程則將下面多線程代碼註釋，將此行代碼截除註釋即可）

                 //多線程
                 Thread t = new Thread(myMainTask);
                 t.Start(ip);
             }

      }
      else
      {
             textblock1.Background = Brushes.Red;
             textblock1.Foreground = Brushes.White;
             textblock1.Text = "IP地址有錯,請更正!";
      }
}

---線程執行的方法體
private void myMainTask(Object ip)
{
       string hostName;

       DateTime begin = DateTime.Now; /*此計時器計算的是每一個線程的掃描時間*/

       Stopwatch stop = new Stopwatch();/*此計時器計算的是總的掃面時間，後續會進行累加*/
       stop.Start();

       IPAddress ipAddress = (IPAddress)ip;

       try
       {
             hostName = Dns.GetHostEntry(ipAddress).HostName;
       }
       catch
       {
             hostName = "(不在線)";
       }

       stop.Stop();
       DateTime end = DateTime.Now;

       TimeSpan ts = end - begin;

       sumTime += stop.ElapsedMilliseconds;

       listbox1.Dispatcher.Invoke(() => listbox1.Items.Add("掃描地址：" + ipAddress.ToString() + " , 掃描用時：" + ts.TotalMilliseconds + "毫秒 , " + " 主機DNS名稱：" + hostName));/*Invoke方法是同步調用，即直到在線程池中實際執行完該委託它才返回*/

        }   

---計算總掃描時間的點擊事件
private void time_get_Click(object sender, RoutedEventArgs e)
{
     textblock1.Text = "掃描總線程所用總時間爲:" + sumTime.ToString() + "毫秒"; 
}