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IP地址的扩展方法
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| using System; | |
| using System.Collections.Generic; | |
| using System.Linq; | |
| using System.Text; | |
| using System.Net; | |
| namespace Helpers | |
| { | |
| public static class SubnetMask | |
| { | |
| public static readonly IPAddress ClassA = IPAddress.Parse("255.0.0.0"); | |
| public static readonly IPAddress ClassB = IPAddress.Parse("255.255.0.0"); | |
| public static readonly IPAddress ClassC = IPAddress.Parse("255.255.255.0"); | |
| public static IPAddress CreateByHostBitLength(int hostpartLength) | |
| { | |
| int hostPartLength = hostpartLength; | |
| int netPartLength = 32 - hostPartLength; | |
| if (netPartLength < 2) | |
| throw new ArgumentException("Number of hosts is to large for IPv4"); | |
| Byte[] binaryMask = new byte[4]; | |
| for (int i = 0; i < 4; i++) | |
| { | |
| if (i * 8 + 8 <= netPartLength) | |
| binaryMask[i] = (byte)255; | |
| else if (i * 8 > netPartLength) | |
| binaryMask[i] = (byte)0; | |
| else | |
| { | |
| int oneLength = netPartLength - i * 8; | |
| string binaryDigit = | |
| String.Empty.PadLeft(oneLength, '1').PadRight(8, '0'); | |
| binaryMask[i] = Convert.ToByte(binaryDigit, 2); | |
| } | |
| } | |
| return new IPAddress(binaryMask); | |
| } | |
| public static IPAddress CreateByNetBitLength(int netpartLength) | |
| { | |
| int hostPartLength = 32 - netpartLength; | |
| return CreateByHostBitLength(hostPartLength); | |
| } | |
| public static IPAddress CreateByHostNumber(int numberOfHosts) | |
| { | |
| int maxNumber = numberOfHosts + 1; | |
| string b = Convert.ToString(maxNumber, 2); | |
| return CreateByHostBitLength(b.Length); | |
| } | |
| } | |
| public static class IPAddressExtensions | |
| { | |
| public static IPAddress GetBroadcastAddress(this IPAddress address, IPAddress subnetMask) | |
| { | |
| byte[] ipAdressBytes = address.GetAddressBytes(); | |
| byte[] subnetMaskBytes = subnetMask.GetAddressBytes(); | |
| if (ipAdressBytes.Length != subnetMaskBytes.Length) | |
| throw new ArgumentException("Lengths of IP address and subnet mask do not match."); | |
| byte[] broadcastAddress = new byte[ipAdressBytes.Length]; | |
| for (int i = 0; i < broadcastAddress.Length; i++) | |
| { | |
| broadcastAddress[i] = (byte)(ipAdressBytes[i] | (subnetMaskBytes[i] ^ 255)); | |
| } | |
| return new IPAddress(broadcastAddress); | |
| } | |
| public static IPAddress GetNetworkAddress(this IPAddress address, IPAddress subnetMask) | |
| { | |
| byte[] ipAdressBytes = address.GetAddressBytes(); | |
| byte[] subnetMaskBytes = subnetMask.GetAddressBytes(); | |
| if (ipAdressBytes.Length != subnetMaskBytes.Length) | |
| throw new ArgumentException("Lengths of IP address and subnet mask do not match."); | |
| byte[] broadcastAddress = new byte[ipAdressBytes.Length]; | |
| for (int i = 0; i < broadcastAddress.Length; i++) | |
| { | |
| broadcastAddress[i] = (byte)(ipAdressBytes[i] & (subnetMaskBytes[i])); | |
| } | |
| return new IPAddress(broadcastAddress); | |
| } | |
| public static bool IsInSameSubnet(this IPAddress address2, IPAddress address, IPAddress subnetMask) | |
| { | |
| IPAddress network1 = address.GetNetworkAddress(subnetMask); | |
| IPAddress network2 = address2.GetNetworkAddress(subnetMask); | |
| return network1.Equals(network2); | |
| } | |
| } | |
| } |
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