问题描述

假设我想向我的子网中的每个主机发送一条 udp 消息(然后从我的子网中的任何主机接收一条 udp 消息):

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):

我现在这样做:

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

但我当然希望在子网不同于 192.168.1/24 的情况下动态地完成此操作.我试过了:

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;

但 IPAddress.Broadcast 代表255.255.255.255"，不能用于发送消息(它会引发异常)...所以:

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

如何获取本地网络适配器广播地址(当然也包括网络掩码)?

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

这是我想出的最终解决方案

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;
}

推荐答案

如果得到本地IP和子网，计算应该没问题.

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

可能是这样的吗?

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("	IP Address is {0}", UnicatIPInfo.Address);
                Console.WriteLine("	Subnet Mask is {0}", UnicatIPInfo.IPv4Mask);
            }
        }
    }
}

给出IP地址和网络掩码时如何计算IP范围?应该给你剩下的.

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