这段程序最早是bigengle兄弟贴在chinaasp上的，是个很不错的程序来讲解ASP.Net的高级应用。不过最大的缺点就是查询中国域名时不支持中文，所出来的信息中文不能显示，小弟我稍微改了一下，这个已经能够支持中文了。呵呵，关于这个例子，我在国外的站点上放了了一个大家可以看
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http://aspx1.brinkster.com/feidao/named.aspx
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这个主机是国外的，所以对中文支持不太好(原因我在《亲密接触ASP.net》中说得很清楚)，大家如果看不到中文，请用选择IE中的"编码"---"简体中文".
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下面是源程序。
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1 @ Page Language="C#"
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1 @ Assembly Name="System.Net"
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1 @ Import Namespace="System.Net.Sockets"
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1 @ Import Namespace="System.Text"
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1 @ Import Namespace="System.IO"
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1 @ Import Namespace="System.Collections"
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1<script language="C#" runat="server"> <br>
2void doQuery(Object sender, EventArgs e) <br>
3{ <br>
4String strDomain = txtDomain.Text; <br>
5char[] chSplit = {'.'}; <br>
6string[] arrDomain = strDomain.Split(chSplit); <br>
7<br>
8int nLength = arrDomain[1].Length ; <br>
9Hashtable table = new Hashtable(); <br>
10table.Add("de", "whois.denic.de"); <br>
11table.Add("be", "whois.dns.be"); <br>
12table.Add("gov", "whois.nic.gov"); <br>
13table.Add("mil", "whois.nic.mil"); <br>
14<br>
15String strServer ; //define whois server <br>
16//if the domainname's end is cn then the server is cnnic ,otherwise is networksolutions <br>
17if (arrDomain[arrDomain.Length - 1] == "cn") <br>
18{ <br>
19strServer = "159.226.6.139" ; <br>
20} <br>
21else <br>
22{ <br>
23strServer = "whois.networksolutions.com"; <br>
24} <br>
25<br>
26if (table.ContainsKey(arrDomain[1])) <br>
27{ <br>
28strServer = table[arrDomain[1]].ToString(); <br>
29} <br>
30else if (nLength == 2) <br>
31{ <br>
32// 2-letter TLD's always default to RIPE in Europe <br>
33strServer = "whois.ripe.net"; <br>
34} <br>
35<br>
36String strResponse; <br>
37bool bSuccess = DoWhoisLookup(strDomain, strServer, out strResponse); <br>
38if (bSuccess) <br>
39{ <br>
40txtResult.Text = strResponse; <br>
41} <br>
42else <br>
43{ <br>
44txtResult.Text = "Lookup failed"; <br>
45} <br>
46} <br>
47<br>
48bool DoWhoisLookup(String strDomain, String strServer, out String strResponse) <br>
49{ <br>
50strResponse = "none"; <br>
51bool bSuccess = false; <br>
52<br>
53TCPClient tcpc = new TCPClient(); <br>
54if (0 == tcpc.Connect(strServer, 43)) <br>
55{ <br>
56strDomain += "\r\n"; <br>
57Byte[] arrDomain = Encoding.ASCII.GetBytes(strDomain.ToCharArray()); <br>
58try <br>
59{ <br>
60String str; <br>
61Stream s = tcpc.GetStream(); <br>
62s.Write(arrDomain, 0, strDomain.Length); <br>
63<br>
64StreamReader sr = new StreamReader(tcpc.GetStream(), Encoding.Default); <br>
65StringBuilder strBuilder = new StringBuilder(); <br>
66while (-1 != sr.Peek()) <br>
67{ <br>
68strBuilder.Append(sr.ReadLine()+"<br>"); <br>
69<br>
70} <br>
71tcpc.Close(); <br>
72<br>
73bSuccess = true; <br>
74strResponse = strBuilder.ToString(); <br>
75} <br>
76catch(Exception e) <br>
77{ <br>
78strResponse = e.ToString(); <br>
79} <br>
80<br>
81return bSuccess; <br>
82} <br>
83else <br>
84{ <br>
85strResponse = "Could not connect to Whois server"; <br>
86return false; <br>
87} <br>
88<br>
89return false; <br>
90} <br>
91</script>
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1<html> <br/>
2<head> <br/>
3<meta content="text/html; charset=utf-8" http-equiv="Content-Type"/> <br/>
4<title></title> <br/>
5</head> <br/>
6<body> <br/>
7<br/>
8<form runat="server"> <br/>
9Domain name: WWW . <asp:textbox id="txtDomain" runat="server" value=""></asp:textbox> <br/>
10<asp:button id="btnQuery" onclick="doQuery" runat="server" text="Query!"></asp:button> <br/>
11<br/><hr width="100%"/><br/> <br/>
12<asp:label id="txtResult" runat="server"></asp:label> <br/>
13</form> <br/>
14<br/>
15</body> <br/>
16</html>