Question

当尝试访问返回的值时，我被告知对象引用未设置为对象的实例，其中：

return address.Address;

我从其他人的线程中使用的代码来提取网关IP：

public static IPAddress getDefaultGateway()
{
    var card = NetworkInterface.GetAllNetworkInterfaces().FirstOrDefault();
    if (card == null) return null;
    var address = card.GetIPProperties().GatewayAddresses.FirstOrDefault();
    return address.Address;
}

Answer 1

试试这个：

public static IPAddress GetADefaultGateway()
{
    foreach (var card = NetworkInterface.GetAllNetworkInterfaces())
    {
       if (card == null)
       {
         continue;
       }

       foreach (var address = card.GetIPProperties().GatewayAddresses)
       {
         if (address == null)
         {
           continue;
         }

         //We've found one
         return address.Address;
       }
    }

    //We didn't find any
    return null;
}

获取网关地址时出现NullReferenceException

1 个答案: