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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} ips 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？……
