从给定的IP地址获取所有打开的端口 [英] get all open ports from given ip address

问题描述

如何从C#3.0中列出系统的所有开放端口.应该快速运行

我正在尝试通过此代码，但是它非常慢

How to list out all open ports of the system from C#3.0.It should fast

I am trying by this code but it is very slow

for (int CurrPort = 1; CurrPort <= 25; CurrPort++) 
{ 
  TcpClient TcpScan = new TcpClient(); 
  try 
  { 
    // Try to connect 
    TcpScan.Connect("192.168.0.1", CurrPort); 
    // If there's no exception, we can say the port is open 
    MessageBox.Show("Port " + CurrPort + " open"); 
  } 
  catch 
  { 
    // An exception occured, thus the port is probably closed 
    MessageBox.Show("Port " + CurrPort + " closed"); 
  }
}

推荐答案

端口扫描程序通常并行扫描，因此您可以执行以下操作(.net 4):

Port scanners usually scan in parallel so you can do the following (.net 4):

List<Task> tasks = new List<Task>();

for(int i =1;i<65535;i++)
{
    Task t = Task.Factory.StartNew( () => portscan(i));
    tasks.Add(t);
}

Task.WaitAll(tasks.ToArray());

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