关于Winform中的数据采集...

//在百度的搜索结果中，用如下方式获取搜索结果中的网址，求在谷歌和雅虎里面怎么写代码，静态标签和百度不一样怎么做？
                if(comboBox1.SelectedIndex==0)
                {
                    if (myBrowser.Document.GetElementById("1") == null)
                    {
                        Log("No result!");
                    }
                    else
                    {
                        for (int i = 1; i <= _pageSize; i++)
                        {                            htmlTmp = myBrowser.Document.GetElementById(i.ToString()).GetElementsByTagName("tbody")[0].GetElementsByTagName("tr")[0].GetElementsByTagName("td")[0].GetElementsByTagName("a")[0];
                            if (htmlTmp != null)
                            {                                url = htmlTmp.GetAttribute("href");
                                if (string.IsNullOrEmpty(url))
                                {
                                    url = htmlTmp.Children[0].GetAttribute("href");                                }                                content = myBrowser.Document.GetElementById(i.ToString()).GetElementsByTagName("tbody")[0].GetElementsByTagName("tr")[0].GetElementsByTagName("td")[0].InnerText;                                if (myBrowser.Document.GetElementById(i.ToString()).GetElementsByTagName("tbody")[0].GetElementsByTagName("tr").Count > 1)
                                {
                                    content = myBrowser.Document.GetElementById(i.ToString()).GetElementsByTagName("tbody")[0].GetElementsByTagName("tr")[1].OuterText;
                                }                                string tmpStr = content.Replace("\r\n", "`");
                                SearcharTempModel tempmd = new SearcharTempModel();                                tempmd.SitId = i;
                                tempmd.SitTitle = tmpStr.Split('`')[0].Replace("'", "''");
                                if (url.IndexOf("http://", 0) > -1)
                                {
                                    if (url.IndexOf("/", 9) > 0)
                                    {
                                        tempmd.SitAddress = url.Substring(0, url.IndexOf("/", 9));
                                    }
                                    else
                                    {
                                        tempmd.SitAddress = url;
                                    }
                                }
                                tempmd.TitleUrl = url;
                                tempmd.SitCont = content.Replace(tmpStr.Split('`')[0], "").Replace("'", "''");
                                selist.Add(tempmd);
                            }
                        }
                    }
                }
我只截取一部分代码，以下的是百度搜索结果，可以把红色字体的网址获取出来，在雅虎和谷歌就不会了，请大侠解决一下
<table cellpadding="0" cellspacing="0" class="result" id="3"><tr><td class=f><a  onmousedown="return c({'fm':'as','F':'779717CA','F1':'9D73F1E4','F2':'4CA6DD6B','F3':'54E5243F','T':'1284425043','title':this.innerHTML,'url':this.href,'p1':3,'y':'EF7E3BFC'})" href="http://www.aa52.com/"  target="_blank" ><font size="3">云南户外运动网 西南地区最具人气的户外运动门户网站！</font></a><br><font size=-1> 云南户外运动网 云南本土最具人气的户外运动、探险网络平台!致力推动云南登山户外运动发展！<br><font color="#008000">www.aa52.com/ 2010-9-13  </font> - <a href="http://cache.baidu.com/c?m=9d78d513d99012bb1fadca71575091240e55f37e2192955068d4e41bc0635b564711b2e6783f&p=8b2a961a8a9b11a05beed2315205&user=baidu"  target="_blank"  class="m">百度快照</a> <br></font></td></tr></table><br>

<table cellpadding="0" cellspacing="0" class="result" id="4"><tr><td class=f><a  onmousedown="return c({'fm':'as','F':'7F9317CA','F1':'9D73F1E4','F2':'4CA6BE6B','F3':'54E5243F','T':'1284425043','title':this.innerHTML,'url':this.href,'p1':4,'y':'BBD931D6'})" href="http://www.aa173.com/"  target="_blank" ><font size="3"><em>AA</em>游戏对战平台-高校专属对战平台</font></a><br><font size=-1> <em>AA</em>游戏对战平台注册帐号登陆帐号忘记密码返回首页 玩家登陆通行证  密码  在这台电脑上记住我 注册找回密码 高校联盟排名 学校名称 战绩 排名人数...<br><font color="#008000">www.aa173.com/ 2010-9-13  </font> - <a href="http://cache.baidu.com/c?m=9f65cb4a8c8507ed4fece763105392230e54f7306fd4d51468d4e419ce3b4655023ba3ed287143&p=c467ca16d9c01bff57ee97124c4c&user=baidu"  target="_blank"  class="m">百度快照</a> <br></font></td></tr></table><br>