IPAddress,IPEndPoint,IPHostEntry介绍

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

01
class IPAddressSample 

02
{ 

03
    public static void Main() 

04
    { 

05
        //创建5个IPAddress对象，并赋值 

06
        IPAddress newaddress1 = IPAddress.Parse("192.168.1.1");//把192.168.1.1转换为IPAddress 

07
        IPAddress newaddress2 = IPAddress.Loopback;//本地环回地址 

08
        IPAddress newaddress3 = IPAddress.Broadcast;//广播地址 

09
        IPAddress newaddress4 = IPAddress.Any; 

10
        IPAddress newaddress5 = IPAddress.None; 

11
  
12
        /*用System.net.dns类中的GetHostEntry()和GetHostName()方法来建立一个本 

13
        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 

14
        地址*/

15
  
16
        IPHostEntry here = Dns.GetHostEntry(Dns.GetHostName()); 

17
        IPAddress localaddress = here.AddressList[0]; 

18
  
19
        //判断newaddress2地址是否为环回地址 

20
        if (IPAddress.IsLoopback(newaddress2)) 

21
            Console.WriteLine("The Loopback address is: {0}", newaddress2.ToString()); 

22
        else

23
            Console.WriteLine("Error obtaining the loopback address"); 

24
  
25
        //打印本地IP地址 

26
        Console.WriteLine("The Local IP address is: {0}\n", localaddress.ToString()); 

27
  
28
        //判断本地IP地址是否为环回地址 

29
        if (localaddress == newaddress2) 

30
            Console.WriteLine("The loopback address is the same as local address.\n"); 

31
        else

32
            Console.WriteLine("The loopback address is not the local address.\n"); 

33
  
34
        //打印其他IP地址 

35
        Console.WriteLine("The test address is: {0}", newaddress1.ToString()); 

36
        Console.WriteLine("Broadcast address: {0}", newaddress3.ToString()); 

37
        Console.WriteLine("The ANY address is: {0}", newaddress4.ToString()); 

38
        Console.WriteLine("The NONE address is: {0}", newaddress5.ToString()); 

39
  
40
        //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 

41
  
42
        Console.ReadLine(); 

43
    }

IPEndPoint代表网络端点的IP地址和端口号

实例化IPEndPoint

1
IPAddress newaddress = IPAddress.Parse("192.168.1.1"); 

2
 
3
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

01
class IPEndPointSample 

02
{ 

03
    public static void Main() 

04
    { 

05
        IPAddress newaddress = IPAddress.Parse("192.168.1.1"); 

06
        //创建IPEndPoint实例 

07
        IPEndPoint ex = new IPEndPoint(newaddress,8000); 

08
        Console.WriteLine("The IPEndPoint is:{0}", ex.ToString()); 

09
        Console.WriteLine("The AddressFamily is:{0}", ex.AddressFamily); 

10
        Console.WriteLine("The Address is:{0},and the port is:{1}", ex.Address, ex.Port); 

11
        Console.WriteLine("The Min Port Number is:{0}", IPEndPoint.MinPort); 

12
        Console.WriteLine("The Max Port Number is:{0}", IPEndPoint.MaxPort); 

13
        //用port属性单独改变IPEndPoint对象的端口值 

14
        ex.Port = 80; 

15
        Console.WriteLine("The changed IPEndPoint vaule is:{0}", ex.ToString()); 

16
        //存储IPEdnPoint实例 

17
        SocketAddress sa = ex.Serialize(); 

18
        Console.WriteLine("The Socketaddress is:{0}", sa.ToString()); 

19
        Console.ReadLine(); 

20
    } 

21
}

IPHostEntry代表某一IP的实体

01
class IPHostEntryClassSample 

02
{ 

03
    public static void Main(string[] argv) 

04
    { 

05
        IPHostEntry results = Dns.GetHostEntry(IPAddress.Parse("127.0.0.1")); 

06
        Console.WriteLine("Host name: {0}", results.HostName); 

07
        foreach (string alias in results.Aliases) 

08
        { 

09
            Console.WriteLine("Alias: {0}", alias); 

10
        } 

11
        foreach (IPAddress address in results.AddressList) 

12
        { 

13
            Console.WriteLine("Address: {0}", address.ToString()); 

14
        } 

15
    } 

16
}