C# 获取局域网下的设备IP范围

1     private void RefreshButton_OnClick(object sender, RoutedEventArgs e)
2     {
3         var maxSubIp = GetMaxSubIp("10.214.18.1", "255.255.254.0");
4         SubNetIpTextBlock.Text = $"10.214.18.1-{maxSubIp}";
5     }

 1     /// <summary>
 2     /// 获取局域网下最大IP
 3     /// </summary>
 4     /// <param name="defaultGateway">默认网关</param>
 5     /// <param name="subNetMask">子网掩码</param>
 6     private string GetMaxSubIp(string defaultGateway, string subNetMask)
 7     {
 8         var subNetBinary = ConvertIpToBinary(subNetMask);
 9         if (!subNetBinary.EndsWith("0"))
10         {
11             return string.Empty;
12         }
13         var existIndex = subNetBinary.IndexOf("0", StringComparison.Ordinal);
14         var gatewayBinary = ConvertIpToBinary(defaultGateway);
15         var maxIpLeft = gatewayBinary.Substring(0, existIndex);
16 
17         //最大的子网IP
18         var maxSubIpBinary = maxIpLeft.PadRight(32, '1');
19         var maxSubIp = ConvertBinaryToIp(maxSubIpBinary);
20         return maxSubIp;
21     }

 1     /// <summary>
 2     /// 将二进制数据转为IP
 3     /// </summary>
 4     /// <param name="ipBinaryData">IP二进制数据，如：00001010110101100001001000000001</param>
 5     /// <returns>IP地址，如：10.214.18.1</returns>
 6     private string ConvertBinaryToIp(string ipBinaryData)
 7     {
 8         var item1 = Convert.ToInt32(ipBinaryData.Substring(0, 8), 2);
 9         var item2 = Convert.ToInt32(ipBinaryData.Substring(8, 8), 2);
10         var item3 = Convert.ToInt32(ipBinaryData.Substring(16, 8), 2);
11         var item4 = Convert.ToInt32(ipBinaryData.Substring(24, 8), 2);
12         return $"{item1}.{item2}.{item3}.{item4}";
13     }
14 
15     /// <summary>
16     /// 将IP转为二进制数据
17     /// </summary>
18     /// <param name="ipAddress">IP地址，如：10.214.18.1</param>
19     /// <returns>IP二进制数据，如：00001010110101100001001000000001</returns>
20     private string ConvertIpToBinary(string ipAddress)
21     {
22         var items = ipAddress.Split('.');
23         var stringBuilder = new StringBuilder();
24         foreach (var item in items)
25         {
26             var binary = Convert.ToString(int.Parse(item), 2);
27             var ipPieceBinary = binary.PadLeft(8, '0');
28             stringBuilder.Append(ipPieceBinary);
29         }
30         return stringBuilder.ToString();
31     }