重载的时候为什么不能获取参数。。。(重载Directory)

Question

<% @Page Language="C#" %>
<% @Import Namespace="System.IO" %>
<%
string strDir2List=Request.QueryString.Get("dir");
Directory thisOne=null;
try
{
  thisOne=new Directory(strDir2List);
  Response.Write("<p>Creation:"+thisOne.CreationTime.ToString()+"</p>");
  Directory[] subDirectories=thisOne.GetDirectories();
  Response.Write("<ul>");
  for (int i=0;i<subDirectories.Length;i++)
{
   Response.Write("<li><a href=\"listdir.aspx?dir=");
   Response.Write(Server.UrlEncode(subDirectories[i].FullName));
   Response.Write("\">"+subDirectories[i].Name);
   Response.Write("</a><br>");
}
Response.Write("</ul>");
File[] theFiles=thisOne.GetFiles();
Response.Write("<ul>");
for(int i=0;i<theFiles.Length;i++)
{
   Response.Write("<li><a href=\"showfile.aspx?file=");
   Response.Write(Server.UrlEncode(theFiles[i].FullName));
   Response.Write("\">"+theFiles[i].Name);
   Response.Write("</a><br>");
}
Response.Write("</ul>");
}
catch (Exception e)
{
  Response.Write("Access not possible,error:<i>");
  Response.Write(e.ToString()+"</i>");
  Response.End();
}
%>

Answer 1

完整如下：
.........
DirectoryInfo thisOne=null;
try
{
thisOne=new DirectoryInfo(strDir2List);
Response.Write("<p>Creation:"+thisOne.CreationTime.ToString()+"</p>");
DirectoryInfo[] subDirectories=thisOne.GetDirectories();
Response.Write("<ul>");
for (int i=0;i<subDirectories.Length;i++)
{
Response.Write("<li><a href=\"listdir.aspx?dir=");
Response.Write(Server.UrlEncode(subDirectories[i].FullName));
Response.Write("\">"+subDirectories[i].Name);
Response.Write("</a><br>");
}
Response.Write("</ul>");
FileInfo[] theFiles=thisOne.GetFiles();
Response.Write("<ul>");
for(int i=0;i<theFiles.Length;i++)
{
Response.Write("<li><a href=\"showfile.aspx?file=");
Response.Write(Server.UrlEncode(theFiles[i].FullName));
Response.Write("\">"+theFiles[i].Name);
Response.Write("</a><br>");
}
Response.Write("</ul>");
}
catch (Exception e)
{
Response.Write("Access not possible,error:<i>");
Response.Write(e.ToString()+"</i>");
Response.End();
}
...............