Xamarin.Android DhcpInfo.Netmask返回0

Question

我试图用DhcpInfo.Netmask获取我的网络地址，但是我得到的网络掩码是0，即使我的设备连接到一个wifi网络。这是我使用的代码：

namespace checks
{
[Activity(Label = "checks", MainLauncher = true, Icon = "@drawable/icon")]
public class MainActivity : Activity
{
    protected override void OnCreate(Bundle bundle)
    {
        base.OnCreate(bundle);
        SetContentView (Resource.Layout.Main);

        Button dataButton = FindViewById<Button>(Resource.Id.connectionDataButton);

        dataButton.Click += (object sender, EventArgs e) =>
        {

            WifiManager wifiManager = (WifiManager)GetSystemService(Context.WifiService);
            var d = wifiManager.DhcpInfo;

            Console.WriteLine("My Net mask: {0}", d.Netmask);



        };

    }
}

}

Answer 1

我试图用DhcpInfo.Netmask获取我的网络地址，但是我得到的网络掩码是0，即使我的设备连接到一个wifi网络。

这是一个已知问题。

作为解决办法，您可以使用以下代码获取NetworkPrefixLength并通过这张桌子将其转换为NetMask

WifiManager wifiManager = (WifiManager)GetSystemService(Context.WifiService);
DhcpInfo dhcpInfo = wifiManager.DhcpInfo;
try
{
    byte[] ipAddress = BitConverter.GetBytes(dhcpInfo.IpAddress);
    InetAddress inetAddress = InetAddress.GetByAddress(ipAddress);
    NetworkInterface networkInterface = NetworkInterface.GetByInetAddress(inetAddress);
    foreach (InterfaceAddress address in networkInterface.InterfaceAddresses)
    {
        //short netPrefix = address.getNetworkPrefixLength(); 
        //Log.d(TAG, address.toString());
        var prefix=address.NetworkPrefixLength;
    }
}
catch (IOException exception)
{
    Log.Debug("Exception:", exception.Message);
}