两道面试题，欢迎高手来指正

一、用ASP.NET实现正则抓取匹配 www.163.com 首页的财经专栏

要求:提取出连接和标题

时间:1小时内

注：首先,需要动态获取http://www.163.com 的内容，接着获取到网易的首页内容后,用正则进行匹配.得到想要的内容.，把标题和链接保存为数组，

我的完成：

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Net;
using System.IO;

using System.Text;
using System.Text.RegularExpressions;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btn163_Click(object sender, EventArgs e)
    {
        string str = GetSiteContent();
        int index = str.IndexOf("<a href=\"http://money.163.com/blog/\">财经专栏</a>");
        str = str.Substring(index);
        index = str.IndexOf("健康专栏");
        str = str.Substring(0, index);
        Regex re = new Regex(@"<a[\s]+href=(?<Link>[^\s>]+)[^>]*>(?<Text>[^<]*)</a>");
        MatchCollection mc = re.Matches(str);
        string[] strList = new string[mc.Count];
        StringBuilder sb = new StringBuilder();
        for (int n = 0; n < mc.Count; n++)
        {
            strList[n] = mc[n].Groups[0].ToString();
            sb.AppendFormat("{0}</br>", strList[n]);
        }
        this.Label1.Text = sb.ToString();
    }

    private string GetSiteContent()
    {
        WebRequest request = WebRequest.Create("http://www.163.com");
        WebResponse response = request.GetResponse();
        Stream stream = response.GetResponseStream();
        StreamReader reader = new StreamReader(stream, Encoding.Default);
        string str = reader.ReadToEnd();
        reader.Close();
        stream.Close();
        response.Close();
        return str; 
    }
}

二、有一个文本，内容为

http://www.test.com/info.html
http://www.test.com/info3.html
http://www.test.com/info2.html
http://www.test.com/info1.html
http://www.test.com/info2.html
http://www.test.com/info1.html

要求结果为去除重复项，按出现次数进行排序

我的完成:

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;
using System.Text;

namespace WebApplication1
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            string[] strList1 = GetStringList();
            var tt = strList1.Distinct();
            string[] strList2 = tt.ToArray();
            int[] num = new int[strList2.Length];
            for (int m = 0; m < tt.Count(); m++)
            {
                num[m] = strList1.Count((s) => s == strList2[m]);
            }
            int t1, t2;
            string str1, str2;
            for(int n=0;n<num.Length;n++)
            {
                for (int t = 0; t < num.Length-1; t++)
                {
                    t1 = num[t];
                    t2 = num[t + 1];
                    if (t2 > t1)
                    {
                        num[t] = t2;
                        num[t + 1] = t1;
                        str1 = strList2[t];
                        str2 = strList2[t+1];
                        strList2[t] = str2;
                        strList2[t + 1] = str1;
                    }
                }
            }
            
            strList1.ToString();
            
        }

        private string[] GetStringList()
        {
            StreamReader reader = new StreamReader(this.File1.PostedFile.InputStream, Encoding.Default);
            string str = reader.ReadToEnd();
            reader.Close();

            string[] strList = str.Split("\r\n".ToCharArray());
            ArrayList list = new ArrayList();
            foreach (string s in strList)
            {
                if (s.Length > 0)
                {
                    list.Add(s);
                }
            }
            string[] strList2 = new string[list.Count];
            for (int t = 0; t < list.Count; t++)
            {
                strList2[t] = list[t].ToString();

            } return strList2;
        }

    }
}