展现C# 清单5.10 生成exe文件执行的问题

清单 5.10 通过一个索引获取一个IP地址

1: using System;

2: using System.Net;

3:

4: class ResolveDNS

5: {

6: IPAddress[] m_arrIPs;

7:

8: public void Resolve(string strHost)

9: {

10: IPHostEntry iphe = Dns.GetHostByName(strHost);

11: m_arrIPs = iphe.AddressList;

12: }

13:

14: public IPAddress this[int nIndex]

15: {

16: get

17: {

18: return m_arrIPs[nIndex];

19: }

20: }

21:

22: public int Count

23: {

24: get { return m_arrIPs.Length; }

25: }

26: }

27:

28: class DNSResolverApp

29: {

30: public static void Main()

31: {

32: ResolveDNS myDNSResolver = new ResolveDNS();

33: myDNSResolver.Resolve("http://www.microsoft.com");

34:

35: int nCount = myDNSResolver.Count;

36: Console.WriteLine("Found {0} IP's for hostname", nCount);

37: for (int i=0; i < nCount; i++)

38: Console.WriteLine(myDNSResolver[i]);

39: }

40: }

编译环境：

Visual Studio .NET2003 version 7.1.3091 Microsoft Visual C# .NET

Microsoft .NET Framework version 1.1.4322 sp1

生成的exe文件，执行后报错：

未处理的“System.Net.Sockets.SocketException”类型的异常出现在 system.dll 中。

其他信息: The requested name is valid and was found in the database, but it does not have the correct associated data being resolved for

这是为什么呢？……