C#关于URL地址操作

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// 获取域名(不包括二级域名)
    public string GetUrlDomainName(string strHtmlPagePath)
    {
        string p = @"http://[^\.]*\.(?<domain>[^/]*)";
        Regex reg = new Regex(p, RegexOptions.IgnoreCase);
        Match m = reg.Match(strHtmlPagePath);
        return m.Groups["domain"].Value;
    }

// 截取域名（包括二级域名）
Uri uriTmp = new Uri(@"http://fff.sohu.com/newsecond/searchmore/bs-CS__address_sdf--1_ff=ffffssssss.htm");
Response.Write(uriTmp.Host.ToString());

其他操作：

    public string[] GetUrlFolerName(string strHtmlPagePath)
    {
        //抓取网址字符串中的文件目录

        int at = 0;
        int start = 0;
        int notei = 0;
        int endi = 0;
        int[] myIntArray = new int[10];
        string[] ArrayFolderName = null;
        string NewFolderName;
        while ((start < strHtmlPagePath.Length) && (at > -1))
        {
            at = strHtmlPagePath.IndexOf('/', start);
            if (at == -1) break;
            myIntArray[notei] = at;
            start = at + 1;
            notei = notei + 1;
            endi = at;
        }
        ArrayFolderName = new string[notei - 1];
        for (int i = 0; i < notei; i++)
        {
            if (myIntArray[i] > 0)
            {
                if (myIntArray[i + 1] > 0)
                {
                    NewFolderName = strHtmlPagePath.Substring(myIntArray[i] + 1, myIntArray[i + 1] - myIntArray[i] - 1);
                    ArrayFolderName.SetValue(NewFolderName, i);
                }

            }
        }
        return ArrayFolderName;
    }

    public string GetUrlFileName(string strHtmlPagePath)
    {
        //抓取网址字符串中的文件名称
        int at = 0;
        int start = 0;
        int notei = 0;
        int endi = 0;
        int[] myIntArray = new int[10];
        string NewFileName = "";
        while ((start < strHtmlPagePath.Length) && (at > -1))
        {
            at = strHtmlPagePath.IndexOf('/', start);
            if (at == -1) break;
            myIntArray[notei] = at;
            start = at + 1;
            notei = notei + 1;
            endi = at;
        }

        for (int i = 0; i < notei; i++)
        {
            if (myIntArray[i] > 0)
            {
                if (myIntArray[i + 1] == 0)
                {
                    NewFileName = strHtmlPagePath.Substring(myIntArray[i] + 1, strHtmlPagePath.Length - myIntArray[i] - 1);

                }
            }
        }
        return NewFileName.ToLower();

    }