此代码在大约 1 秒内扫描我的网络 255 个 D 级段。我在 VB.net 中编写了它，并将其翻译为 C#（如果有任何错误，敬请原谅）。将其粘贴到控制台项目中并运行。根据需要修改。
注意：代码是not生产就绪，需要改进，特别是实例计数（尝试实现TaskFactory with a BlockingCollection反而）。
如果结果不稳定，请修改 ttl（生存时间）和超时。
运行代码将得到如下结果：
Pinging 255 destinations of D-class in 192.168.1.*
Active IP: 192.168.1.100
Active IP: 192.168.1.1
Finished in 00:00:00.7226731. Found 2 active IP-addresses.
C# code:
using System.Net.NetworkInformation;
using System.Threading;
using System.Diagnostics;
using System.Collections.Generic;
using System;
static class Module1
{
private static List<Ping> pingers = new List<Ping>();
private static int instances = 0;
private static object @lock = new object();
private static int result = 0;
private static int timeOut = 250;
private static int ttl = 5;
public static void Main()
{
string baseIP = "192.168.1.";
Console.WriteLine("Pinging 255 destinations of D-class in {0}*", baseIP);
CreatePingers(255);
PingOptions po = new PingOptions(ttl, true);
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
byte[] data = enc.GetBytes("abababababababababababababababab");
SpinWait wait = new SpinWait();
int cnt = 1;
Stopwatch watch = Stopwatch.StartNew();
foreach (Ping p in pingers) {
lock (@lock) {
instances += 1;
}
p.SendAsync(string.Concat(baseIP, cnt.ToString()), timeOut, data, po);
cnt += 1;
}
while (instances > 0) {
wait.SpinOnce();
}
watch.Stop();
DestroyPingers();
Console.WriteLine("Finished in {0}. Found {1} active IP-addresses.", watch.Elapsed.ToString(), result);
Console.ReadKey();
}
public static void Ping_completed(object s, PingCompletedEventArgs e)
{
lock (@lock) {
instances -= 1;
}
if (e.Reply.Status == IPStatus.Success) {
Console.WriteLine(string.Concat("Active IP: ", e.Reply.Address.ToString()));
result += 1;
} else {
//Console.WriteLine(String.Concat("Non-active IP: ", e.Reply.Address.ToString()))
}
}
private static void CreatePingers(int cnt)
{
for (int i = 1; i <= cnt; i++) {
Ping p = new Ping();
p.PingCompleted += Ping_completed;
pingers.Add(p);
}
}
private static void DestroyPingers()
{
foreach (Ping p in pingers) {
p.PingCompleted -= Ping_completed;
p.Dispose();
}
pingers.Clear();
}
}
和VB.net代码：
Imports System.Net.NetworkInformation
Imports System.Threading
Module Module1
Private pingers As New List(Of Ping)
Private instances As Integer = 0
Private lock As New Object
Private result As Integer = 0
Private timeOut As Integer = 250
Private ttl As Integer = 5
Sub Main()
Dim baseIP As String = "192.168.1."
Dim classD As Integer = 1
Console.WriteLine("Pinging 255 destinations of D-class in {0}*", baseIP)
CreatePingers(255)
Dim po As New PingOptions(ttl, True)
Dim enc As New System.Text.ASCIIEncoding
Dim data As Byte() = enc.GetBytes("abababababababababababababababab")
Dim wait As New SpinWait
Dim cnt As Integer = 1
Dim watch As Stopwatch = Stopwatch.StartNew
For Each p As Ping In pingers
SyncLock lock
instances += 1
End SyncLock
p.SendAsync(String.Concat(baseIP, cnt.ToString()), timeOut, data, po)
cnt += 1
Next
Do While instances > 0
wait.SpinOnce()
Loop
watch.Stop()
DestroyPingers()
Console.WriteLine("Finished in {0}. Found {1} active IP-addresses.", watch.Elapsed.ToString(), result)
Console.ReadKey()
End Sub
Sub Ping_completed(s As Object, e As PingCompletedEventArgs)
SyncLock lock
instances -= 1
End SyncLock
If e.Reply.Status = IPStatus.Success Then
Console.WriteLine(String.Concat("Active IP: ", e.Reply.Address.ToString()))
result += 1
Else
'Console.WriteLine(String.Concat("Non-active IP: ", e.Reply.Address.ToString()))
End If
End Sub
Private Sub CreatePingers(cnt As Integer)
For i As Integer = 1 To cnt
Dim p As New Ping
AddHandler p.PingCompleted, AddressOf Ping_completed
pingers.Add(p)
Next
End Sub
Private Sub DestroyPingers()
For Each p As Ping In pingers
RemoveHandler p.PingCompleted, AddressOf Ping_completed
p.Dispose()
Next
pingers.Clear()
End Sub
End Module
