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asp+初体验---用c#写的asp+域名查询程序

March 25,2004

  终于有时间可以学点新东西了，今天大略看了一下有关asp+的资料，并且写了个域名查询的页面，感觉很不错，asp+比
起asp来进步实在是太大了，尽管用asp+组件也能实现域名查询的功能，并且前几天我用vc写过这么个组件，但用asp+简单
方便多了。好了，废话少提，看源码吧。

<% @Page Language="C#" %>
<% @Assembly Name="System.Net" %>
<% @Import Namespace="System.Net.Sockets" %>
<% @Import Namespace="System.Text" %>
<% @Import Namespace="System.IO" %>
<% @Import Namespace="System.Collections" %>
<script language="C#" runat="server">
void doQuery(Object sender, EventArgs e)
{
  String strDomain = txtDomain.Text;
  char[] chSplit = {'.'};
  string[] arrDomain = strDomain.Split(chSplit);

  int nLength = arrDomain[1].Length ;
  Hashtable table = new Hashtable();
  table.Add("de", "whois.denic.de");
  table.Add("be", "whois.dns.be");
  table.Add("gov", "whois.nic.gov");
  table.Add("mil", "whois.nic.mil");

  String strServer ;       //define whois server
  //if the domainname's end is cn then the server is cnnic ,otherwise is networksolutions
  if (arrDomain[arrDomain.Length - 1] == "cn")
{
   strServer = "159.226.6.139" ;
}
  else
{
   strServer = "whois.networksolutions.com";
}

  if (table.ContainsKey(arrDomain[1]))
  {
strServer = table[arrDomain][1]].ToString();
  }
  else if (nLength == 2)
  {
// 2-letter TLD's always default to RIPE in Europe
strServer = "whois.ripe.net";
  }

  String strResponse;
  bool bSuccess = DoWhoisLookup(strDomain, strServer, out strResponse);
  if (bSuccess)
  {
txtResult.Text = strResponse;
  }
  else
  {
txtResult.Text = "Lookup failed";
  }
}

bool DoWhoisLookup(String strDomain, String strServer, out String strResponse)
{
  strResponse = "none";
  bool bSuccess = false;

  TCPClient tcpc = new TCPClient();
  if (0 == tcpc.Connect(strServer, 43))
  {
strDomain += "rn";
Byte[] arrDomain = Encoding.ASCII.GetBytes(strDomain.ToCharArray());
try
{
      Stream s = tcpc.GetStream();
      s.Write(arrDomain, 0, strDomain.Length);

      StreamReader sr = new StreamReader(tcpc.GetStream(), Encoding.ASCII);
      StringBuilder strBuilder = new StringBuilder();
      while (-1 != sr.Peek())
      {
      strBuilder.Append(sr.ReadLine()+"<br>");
      }
      tcpc.Close();

      bSuccess = true;
      strResponse = strBuilder.ToString();
}
catch(Exception e)
{
      strResponse = e.ToString();
}

return bSuccess;
  }
  else
  {
strResponse = "Could not connect to Whois server";
return false;
  }

  return false;
}
</script>
<html>
<head>
<title></title>
</head>
<body>

<form runat="server">
Domain name: WWW . <asp:TextBox id="txtDomain" value="" runat="server" />
<asp:Button id="btnQuery" OnClick="doQuery" text="Query!" runat="server" />
<BR><HR width="100%"><BR>
<asp:label id="txtResult" runat="server" />
</form>

</body>
</html>