IPAddress,IPEndPoint,IPHostEntry位于命名空间System.Net下，提供对IP地址的操作
IPAddress是.NET封装的IP地址类
常用方法：
1、IPAddress.Parse()
public static IPAddress Parse (string ipString)，这个方法得目的就是将一个ipString转换成为IPAddress类型。
2、IPAddress.Loopback、IPAddress.Broadcast、IPAddress.Any、IPAddress.None都是IPAddress得几个域成员，它们得返回值类型都是IPAddress
class IPAddressSample
{
public static void Main()
{
//创建5个IPAddress对象，并赋值
IPAddress newaddress1 = IPAddress.Parse("192.168.1.1");//把192.168.1.1转换为IPAddress
IPAddress newaddress2 = IPAddress.Loopback;//本地环回地址
IPAddress newaddress3 = IPAddress.Broadcast;//广播地址
IPAddress newaddress4 = IPAddress.Any;
IPAddress newaddress5 = IPAddress.None;
/*用System.net.dns类中的GetHostEntry()和GetHostName()方法来建立一个本
地IP地址，并且建立了一个IPHostEntry对象。用以下两句代码来获取本地IP
地址*/
IPHostEntry here = Dns.GetHostEntry(Dns.GetHostName());
IPAddress localaddress = here.AddressList[0];
//判断newaddress2地址是否为环回地址
if (IPAddress.IsLoopback(newaddress2))
Console.WriteLine("The Loopback address is: {0}", newaddress2.ToString());
else
Console.WriteLine("Error obtaining the loopback address");
//打印本地IP地址
Console.WriteLine("The Local IP address is: {0}\n", localaddress.ToString());
//判断本地IP地址是否为环回地址
if (localaddress == newaddress2)
Console.WriteLine("The loopback address is the same as local address.\n");
else
Console.WriteLine("The loopback address is not the local address.\n");
//打印其他IP地址
Console.WriteLine("The test address is: {0}", newaddress1.ToString());
Console.WriteLine("Broadcast address: {0}", newaddress3.ToString());
Console.WriteLine("The ANY address is: {0}", newaddress4.ToString());
Console.WriteLine("The NONE address is: {0}", newaddress5.ToString());
//用console.readling()使程序在执行完上述代码后不立即退出，在用户输入回车键之后退出程序
Console.ReadLine();
}
IPEndPoint代表网络端点的IP地址和端口号
实例化IPEndPoint
IPAddress newaddress = IPAddress.Parse("192.168.1.1");
IPEndPoint ex = new IPEndPoint(newaddress,8000); //创建IPEndPoint实例
常用属性和方法
ex.Address返回IpEndPoint实例的IP地址
ex.Port返回IpEndPoint实例的端口
class IPEndPointSample
{
public static void Main()
{
IPAddress newaddress = IPAddress.Parse("192.168.1.1");
//创建IPEndPoint实例
IPEndPoint ex = new IPEndPoint(newaddress,8000);
Console.WriteLine("The IPEndPoint is:{0}", ex.ToString());
Console.WriteLine("The AddressFamily is:{0}", ex.AddressFamily);
Console.WriteLine("The Address is:{0},and the port is:{1}", ex.Address, ex.Port);
Console.WriteLine("The Min Port Number is:{0}", IPEndPoint.MinPort);
Console.WriteLine("The Max Port Number is:{0}", IPEndPoint.MaxPort);
//用port属性单独改变IPEndPoint对象的端口值
ex.Port = 80;
Console.WriteLine("The changed IPEndPoint vaule is:{0}", ex.ToString());
//存储IPEdnPoint实例
SocketAddress sa = ex.Serialize();
Console.WriteLine("The Socketaddress is:{0}", sa.ToString());
Console.ReadLine();
}
}
IPHostEntry代表某一IP的实体
class IPHostEntryClassSample
{
public static void Main(string[] argv)
{
IPHostEntry results = Dns.GetHostEntry(IPAddress.Parse("127.0.0.1"));
Console.WriteLine("Host name: {0}", results.HostName);
foreach (string alias in results.Aliases)
{
Console.WriteLine("Alias: {0}", alias);
}
foreach (IPAddress address in results.AddressList)
{
Console.WriteLine("Address: {0}", address.ToString());
}
}
}