你如何得到默认的网络适配器的主机的广播地址？ C＃ [英] How do you get host's broadcast address of the default network adapter? C#

问题描述

让我们说，我想在我的子网发送一个UDP消息每台主机（然后在我的子网接收来自任何主机的UDP消息）：

在现在我做的：

  ip地址广播= IPAddress.Parse（192.168.1.255）; 
  

但我当然希望这是dinamically完成事件的子网是192.168不同。 1/24。我试着：

  ip地址广播= IPAddress.Broadcast; 
  

但IPAddress.Broadcast表示不能被用来发送消息255.255.255.255（它抛出异常）...所以：

我如何获得本地网卡的广播地址（或课程的网络掩码）

这是最后的解决方案，我想出了

 公共ip地址getBroadcastIP（ ）
 {
 ip地址maskIP = getHostMask（）; 
 ip地址主机IP = getHostIP（）; 
 
如果（maskIP == NULL ||主机IP == NULL）
返回NULL; 
 
字节[] = complementedMaskBytes新的字节[4]; 
字节[] = broadcastIPBytes新的字节[4]; 
 
的for（int i = 0;我4;;我++）
 {
 complementedMaskBytes [I] =（字节）〜（maskIP.GetAddressBytes（）的ElementAt（我））; 
 broadcastIPBytes [I] =（字节）（（hostIP.GetAddressBytes（）的ElementAt（ⅰ））| complementedMaskBytes [I]）; 
} 
 
返回新的ip地址（broadcastIPBytes）; 
 
} 
 
 
私有ip地址getHostMask（）
 {
 
的NetworkInterface [] =接口NetworkInterface.GetAllNetworkInterfaces（）; 
 
的foreach（NetworkInterface的接口在接口）
 {
 
 ip地址主机IP = getHostIP（）; 
 
 UnicastIPAddressInformationCollection UnicastIPInfoCol = Interface.GetIPProperties（）UnicastAddresses。 
 
的foreach（UnicastIPAddressInformation UnicatIPInfo在UnicastIPInfoCol）
 {
如果（UnicatIPInfo.Address.ToString（）== hostIP.ToString（））
 {
返回UnicatIPInfo.IPv4Mask; 
} 
} 
} 
 
返回NULL; 
} 
 
私有ip地址getHostIP（）
 {
的foreach（ip地址在IP（Dns.GetHostEntry（Dns.GetHostName（）））。AddressList），其中
 {
如果（ip.AddressFamily == AddressFamily.InterNetwork）
返回的IP; 
} 
 
返回NULL; 
} 
  

解决方案

如果您获得本地IP和子网，它应该是计算没有问题。

像这样的事情可能？

 使用系统; 
使用System.Net.NetworkInformation; 
 
公共类测试
 {
公共静态无效的主要（）
 {
的NetworkInterface [] =接口NetworkInterface.GetAllNetworkInterfaces（）; 
的foreach（NetworkInterface的接口在接口）
 {
如果（Interface.NetworkInterfaceType == NetworkInterfaceType.Loopback）继续; 
如果（Interface.OperationalStatus = OperationalStatus.Up！）继续; 
 Console.WriteLine（Interface.Description）; 
 UnicastIPAddressInformationCollection UnicastIPInfoCol = Interface.GetIPProperties（）UnicastAddresses。 
的foreach（UnicastIPAddressInformation UnicatIPInfo在UnicastIPInfoCol）
 {
 Console.WriteLine（\tIP地址是{0}，UnicatIPInfo.Address）; 
 Console.WriteLine（\tSubnet面膜是{0}，UnicatIPInfo.IPv4Mask）; 
} 
} 
} 
} 
  

< A HREF =htt​​p://stackoverflow.com/questions/1470792/how-to-calculate-the-ip-range-when-the-ip-address-and-the-netmask-is-given>如何计算IP范围给出的IP地址和子网掩码是什么时候？应该给你它的其余部分。

Let's say that I want to send an udp message to every host in my subnet (and then receive an udp message from any host in my subnet):

at the moment I do:

IPAddress broadcast = IPAddress.Parse("192.168.1.255");

but of course I want this to be done dinamically in the event that the subnet is different from 192.168.1/24. I've tried with:

IPAddress broadcast = IPAddress.Broadcast;

but IPAddress.Broadcast represents "255.255.255.255" which can't be used to send messages (it throws an exception)...so:

how do I get the local network adapter broadcast address (or netmask of course)?

THIS IS THE FINAL SOLUTION I CAME UP WITH

public IPAddress getBroadcastIP()
{
    IPAddress maskIP = getHostMask();
    IPAddress hostIP = getHostIP();

    if (maskIP==null || hostIP == null)
        return null;

    byte[] complementedMaskBytes = new byte[4];
    byte[] broadcastIPBytes = new byte[4];

    for (int i = 0; i < 4; i++)
    {
        complementedMaskBytes[i] =  (byte) ~ (maskIP.GetAddressBytes().ElementAt(i));
        broadcastIPBytes[i] = (byte) ((hostIP.GetAddressBytes().ElementAt(i))|complementedMaskBytes[i]);
    }

    return new IPAddress(broadcastIPBytes);

}


private IPAddress getHostMask()
{

    NetworkInterface[] Interfaces = NetworkInterface.GetAllNetworkInterfaces();

    foreach (NetworkInterface Interface in Interfaces)
    {

        IPAddress hostIP = getHostIP();

        UnicastIPAddressInformationCollection UnicastIPInfoCol = Interface.GetIPProperties().UnicastAddresses;

        foreach (UnicastIPAddressInformation UnicatIPInfo in UnicastIPInfoCol)
        {
            if (UnicatIPInfo.Address.ToString() == hostIP.ToString())
            {
                return UnicatIPInfo.IPv4Mask;
            }
        }
    }

    return null;
}

private IPAddress getHostIP()
{
    foreach (IPAddress ip in (Dns.GetHostEntry(Dns.GetHostName())).AddressList)
    {
        if (ip.AddressFamily == AddressFamily.InterNetwork)
            return ip;
    }

    return null;
}

解决方案

If you get the local IP and subnet, it should be no problem to calculate.

Something like this maybe?

using System;
using System.Net.NetworkInformation;

public class test
{
 public static void Main()
 {
  NetworkInterface[] Interfaces = NetworkInterface.GetAllNetworkInterfaces();
  foreach(NetworkInterface Interface in Interfaces)
  {
   if(Interface.NetworkInterfaceType == NetworkInterfaceType.Loopback) continue;
   if (Interface.OperationalStatus != OperationalStatus.Up) continue;
   Console.WriteLine(Interface.Description);
   UnicastIPAddressInformationCollection UnicastIPInfoCol = Interface.GetIPProperties().UnicastAddresses;
   foreach(UnicastIPAddressInformation UnicatIPInfo in UnicastIPInfoCol)
   {
    Console.WriteLine("\tIP Address is {0}", UnicatIPInfo.Address);
    Console.WriteLine("\tSubnet Mask is {0}", UnicatIPInfo.IPv4Mask);
   }
  }
 }
}

How to calculate the IP range when the IP address and the netmask is given? Should give you the rest of it.

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