C# HtmlDocument.GetElementsByTagName方法代码示例

 public static void AttachValueToDataSource(DataSet ds, HtmlDocument doc)
 {
     LoggingService.DebugFormatted("绑定HTML表单数据：{0} 到数据源...", new object[] { doc.Url });
     foreach (string str in tags)
     {
         HtmlElementCollection elementsByTagName = doc.GetElementsByTagName(str);
         foreach (HtmlElement element in elementsByTagName)
         {
             DataRow row;
             string attribute = element.GetAttribute("dbtable");
             string str3 = element.GetAttribute("dbcolumn");
             if (GetDataRow(ds, attribute, out row) && (row != null))
             {
                 if (row.RowState == DataRowState.Unchanged)
                 {
                     row.SetModified();
                 }
                 if (!(string.IsNullOrEmpty(str3) || !row.Table.Columns.Contains(str3)))
                 {
                     string str4 = element.GetAttribute("value").Trim();
                     row[str3] = (str4 == string.Empty) ? Convert.DBNull : str4;
                     LoggingService.DebugFormatted("设置表：{0}列:{1}的值为：{2}", new object[] { attribute, str3, str4 });
                 }
             }
         }
     }
 }

        /// <summary>
        /// Display an HTML document in the tree view, organizing the tree
        /// in accordance with the Document Object Model (DOM)
        /// </summary>
        /// <param name="docResponse">the document to display</param>
        /// <remarks><para>Called by the thread.start to set up for filling the DOM tree</para>
        /// Has to be passed as an object for the ParameterizedThreadStart</remarks>
        public void DisplayInTree(HtmlDocument docResponse)
        {
            HtmlElementCollection elemColl = docResponse.GetElementsByTagName("html");

            _treeView.Nodes.Clear();
            var rootNode = new TreeNode("Web response") {Tag = -1};
            _treeView.Nodes.Add(rootNode);
            FillDomTree(elemColl, rootNode, 0);
        }

        private string FindTitle(HtmlDocument doc)
        {
            var result = String.Empty;

            IQueryable<HtmlElement> h1HEC = doc.GetElementsByTagName("h1").AsQueryable().Cast<HtmlElement>();
            var titleElement = h1HEC.First(e => e.GetAttribute("class") == "title");

            return result;
        }

        private void Login(string username, string password)
        {
            doc = webBrowser1.Document;
            doc.All["ctl00_ctl17_Username"].SetAttribute("value", username);
            doc.All["ctl00_ctl17_Password"].SetAttribute("value", password);

            HtmlElementCollection oHtmlElements = doc.GetElementsByTagName("input");
            oHtmlElements["ctl00_ctl17_LoginButton"].InvokeMember("click");
        }

 private Dictionary<String, String> GetPostData(HtmlDocument doc,string formName, Uri target, Uri baseURL)
 {
     Dictionary<String, String> ret = new Dictionary<String, String>();
     foreach (HtmlElement form in doc.GetElementsByTagName("save_passenger_single"))
         if ((form.GetAttribute("mode").ToLower() == "post") && ((target == (new Uri(baseURL, form.GetAttribute("target"))))))
             foreach (HtmlElement widget in form.GetElementsByTagName("input"))
             {
                 String name = widget.GetAttribute("name");
                 if (name != "")
                     ret.Add(name, widget.GetAttribute("value"));
             }
     return ret;
 }

 /// <summary>
 /// 表示されている自分のツイート数をカウントする
 /// 非常に遅いので未使用
 /// </summary>
 /// <param name="doc"></param>
 /// <returns></returns>
 public int getTweetCount(HtmlDocument doc)
 {
     int count = 0;
     string href0 = "";
     foreach (HtmlElement el in doc.GetElementsByTagName("a"))
     {
         string cname = el.GetAttribute("className");
         if (cname == "tweet-timestamp js-permalink")
         {
             string href = el.GetAttribute("href");
             if ( href0 != href &&
                 href.StartsWith("http://twitter.com/#!/" + screenName)== true) {
                 count++;
                 href0 = href;
             }
         }
     }
     return count;
 }

        private HtmlElement GetElementByXpath(HtmlDocument doc, string xpath)
        {
            if (doc == null) return null;

            xpath = xpath.Replace("/html/", "");
            HtmlElementCollection eleColec = doc.GetElementsByTagName("html"); if (eleColec.Count == 0) return null;
            HtmlElement ele = eleColec[0];
            string[] tagList = xpath.Split(new string[] { "/" }, StringSplitOptions.RemoveEmptyEntries);
            foreach (string tag in tagList)
            {
                System.Text.RegularExpressions.Match mat = System.Text.RegularExpressions.Regex.Match(tag, "(?<tag>.+)\\[@id='(?<id>.+)'\\]");
                if (mat.Success == true)
                {
                    string id = mat.Groups["id"].Value;
                    HtmlElement tmpEle = doc.GetElementById(id);
                    if (tmpEle != null) ele = tmpEle;
                    else
                    {
                        ele = null;
                        break;
                    }
                }
                else
                {
                    mat = System.Text.RegularExpressions.Regex.Match(tag, "(?<tag>.+)\\[(?<ind>[0-9]+)\\]");
                    if (mat.Success == false)
                    {
                        HtmlElement tmpEle = null;
                        foreach (HtmlElement it in ele.Children)
                        {
                            if (it.TagName.ToLower() == tag)
                            {
                                tmpEle = it;
                                break;
                            }
                        }
                        if (tmpEle != null) ele = tmpEle;
                        else
                        {
                            ele = null;
                            break;
                        }
                    }
                    else
                    {
                        string tagName = mat.Groups["tag"].Value;
                        int ind = int.Parse(mat.Groups["ind"].Value);
                        int count = 0;
                        HtmlElement tmpEle = null;
                        foreach (HtmlElement it in ele.Children)
                        {
                            if (it.TagName.ToLower() == tagName)
                            {
                                count++;
                                if (ind == count)
                                {
                                    tmpEle = it;
                                    break;
                                }
                            }
                        }
                        if (tmpEle != null) ele = tmpEle;
                        else
                        {
                            ele = null;
                            break;
                        }
                    }
                }
            }

            if (ele != null)
            {
                if (scrollToViewToolStripMenuItem.Enabled == true)
                {
                    ele.ScrollIntoView(true);
                }
                else
                {
                    ele.ScrollIntoView(false);
                }

                if (colorElementToolStripMenuItem.Enabled == true)
                {
                    CheckElement(ele);
                }
                //ele.Focus();
            }

            return ele;
        }

//.........这里部分代码省略.........

                /************************************
                 *  작동하지 않는 서비스 있을시
                 ************************************/
                if (doc.GetElementById("urlError").InnerText.Trim() == "true")
                {
                    urlError = true;

                    bbStartUrl = doc.GetElementById("bbStartUrl").InnerText.Trim();
                    bbEndUrl = doc.GetElementById("bbEndUrl").InnerText.Trim();
                    bbAnnounceUrl = doc.GetElementById("bbAnnounceUrl").InnerText.Trim();
                    libraryStartUrl = doc.GetElementById("libraryStartUrl").InnerText.Trim();
                    libraryEndUrl = doc.GetElementById("libraryEndUrl").InnerText.Trim();
                    dormStartUrl = doc.GetElementById("dormStartUrl").InnerText.Trim();
                    dormEndUrl = doc.GetElementById("dormEndUrl").InnerText.Trim();
                    mailStartUrl = doc.GetElementById("mailStartUrl").InnerText.Trim();
                    mailEndUrl = doc.GetElementById("mailEndUrl").InnerText.Trim();
                }

                /************************************
                 * 공지사항
                 ************************************/
                if (doc.GetElementById("announce").InnerText != null)
                {
                    MessageBox.Show(doc.GetElementById("announce").InnerText, doc.GetElementById("announceTitle").InnerText);
                }

                if (currentVersion.IndexOf(lastestVersion) != -1)
                {
                    loadingLabel.Text = "최신 버전입니다 :)";
                }

                else
                {
                    loadingLabel.Text = "최신 버전이 아닙니다 :(";
                }

                mainBrowser.Navigate("https://portal.unist.ac.kr/EP/web/login/unist_acube_login_int.jsp");
            }

            /**********************************************************
             *
             *  로그인 창에서 변수 입력
             *
             **********************************************************/

            loadingProgressBar.Value += 1;

            if (e.Url.ToString() == "https://portal.unist.ac.kr/EP/web/login/unist_acube_login_int.jsp")
            {
                System.Threading.Thread.Sleep(2000);
                doc = mainBrowser.Document as HtmlDocument;

                doc.GetElementById("id").SetAttribute("value", Program.id);
                doc.GetElementsByTagName("input")["UserPassWord"].SetAttribute("value", Program.password);
                doc.InvokeScript("doLogin");

                /************************************
                 *  포탈 로그인 단계
                 ************************************/
                loadingLabel.Text = "포탈 로그인중";
                loadingProgressBar.Value += 5;
            }

            /**********************************************************
             *
             *  첫 로그인, 이름 저장, 학사 공지로 이동
             *
             **********************************************************/

            if (e.Url.ToString() == "http://portal.unist.ac.kr/EP/web/portal/jsp/EP_TopFixed.jsp")
            {
                if (isPortalComplete == false)
                {
                    /************************************
                     *  포탈 로그인 완료
                     ************************************/
                    loadingLabel.Text = "포탈 로그인 완료";
                    loadingProgressBar.Value += 5;

                    portalCookie = mainBrowser.Document.Cookie;
                    welcomeLabel.Click += new EventHandler(welcomeLabel_Click);

                    userName = mainBrowser.DocumentTitle.ToString().Split('-')[1].Split('/')[0];
                    welcomeLabel.Text = userName + " 님 환영합니다 :^)";

                    portal = new Portal(portalCookie, this);
                    showBoardGrid(1);

                    isPortalComplete = true;

                    browser.Navigate(bbStartUrl);
                }

                else
                {
                    browser.Navigate(bbStartUrl);
                }
            }
        }

        /// <summary>
        /// Called by the thread.start to set up for filling the DOM tree
        /// </summary>
        /// <param name="elemColl">HTMLElement collection with the "HTML" tag as its root</param>
        /// <remarks>Has to be passed as an object for the ParameterizedThreadStart</remarks>
        private void DisplayInTree(HtmlDocument docResponse)
        {
            HtmlElementCollection elemColl = docResponse.GetElementsByTagName("html");

            tvDocument.Nodes.Clear();
            TreeNode rootNode = new TreeNode("Web response");
            rootNode.Tag = -1;
            tvDocument.Nodes.Add(rootNode);
            FillDomTree(elemColl, rootNode, 0);
        }

        public void getCourceMenu()
        {
            // http://bb.unist.ac.kr/webapps/blackboard/content/courseMenu.jsp?course_id=_11194_1&newWindow=true&openInParentWindow=true&refreshCourseMenu=true

            for (int i = 0; i < board.Count(); i++)
            {
                string url = "http://bb.unist.ac.kr/webapps/blackboard/content/courseMenu.jsp?course_id=" + board[i].url;

                browser.Navigate(url);

                while (browser.ReadyState != WebBrowserReadyState.Complete)
                {
                    Application.DoEvents();
                }

                doc = browser.Document as HtmlDocument;
                HtmlElementCollection options = doc.GetElementsByTagName("Option");

                HtmlElement elements = ElementsByClass(doc, "courseMenu").ElementAt(0);
                HtmlElementCollection lists = elements.GetElementsByTagName("li");
                HtmlElementCollection a = elements.GetElementsByTagName("a");

                board[i].menu = new List<string>();
                board[i].menuUrl = new List<string>();

                for (int j = 0; j < lists.Count; j++)
                {
                    board[i].menu.Add(lists[j].InnerText);
                    board[i].menuUrl.Add(a[j].GetAttribute("href"));
                }
            }

            addCourseMenu();
        }

 /// <summary>
 /// 將網頁原始碼擷取出來
 /// </summary>
 /// <param name="HD">轉換網頁的物件</param>
 /// <returns>回傳出網頁的原始碼</returns>
 public string Getwebpagesource(HtmlDocument HD)
 {
     JQ(HD);
     HtmlElement htmlElement = HD.GetElementsByTagName("HTML")[0];
     return htmlElement.InnerHtml;
 }

        private bool RetrieveDaily(HtmlDocument doc, MoneyDatabaseUpdater dbUpdater)
        {
            bool isRetrievedAny = false;

            foreach (HtmlElement eleTr in doc.GetElementsByTagName("tr"))
            {
                DateTime billTime = DateTime.Now;
                double amount = 0;
                byte changeType = 0;

                foreach(HtmlElement eleTd in eleTr.Children)
                {
                    string className = eleTd.GetAttribute("classname");
                    if (className.Contains("billTime"))
                    {
                        try
                        {
                            billTime = DateTime.Parse(eleTd.InnerText);
                        }
                        catch
                        {
                            continue;
                        }
                    }
                    else if (className.Contains("ft-bold"))
                    {
                        amount = this.GetAmountFromText(eleTd.InnerText);
                    }
                    else if (className.Contains("billAmount"))
                    {
                        changeType = this.GetTypeFromText(eleTd.InnerText);
                    }
                }

                if (amount != 0)
                {
                    Debug.Assert(changeType != 0, "未知的类型出现了！");
                    dbUpdater.AddDaily(billTime, amount, changeType);
                    isRetrievedAny = true;
                }
            }

            return isRetrievedAny;
        }

        public void setBoard()
        {
            doc = browser.Document as HtmlDocument;
            HtmlElementCollection options = doc.GetElementsByTagName("Option");

            int removeCount = 0;

            for (int i = 0; i < options.Count; i++)
            {
                if (options[i].InnerText.IndexOf("Survey") != -1)
                    removeCount++;
                else if (options[i].InnerText.IndexOf("Open Study") != -1)
                    removeCount++;
                else if (options[i].InnerText.IndexOf("Organizations") != -1)
                    removeCount++;
                else if (options[i].InnerText.IndexOf("Show All") != -1)
                    removeCount++;
                else if (options[i].InnerText.IndexOf("Institution Only") != -1)
                    removeCount++;
                else if (options[i].InnerText.IndexOf("Courses Only") != -1)
                    removeCount++;
                else if (options[i].InnerText.IndexOf("UNIST") != -1)
                    removeCount++;
            }

            board = new BBBoard[options.Count - removeCount];

            int j = 0;

            for (int i = 0; i < options.Count; i++)
            {
                string n = options[i].InnerText.Replace("-", "");

                // Open Study 제외
                if (n.IndexOf("Open Study") != -1 || n.IndexOf("Organizations") != -1 || n.IndexOf("Survey") != -1 || n.IndexOf("Show All") != -1 || n.IndexOf("Institution Only") != -1 || n.IndexOf("Courses Only") != -1 || n.IndexOf("UNIST") != -1)
                {
                    j++;
                    continue;
                }

                board[i - j] = new BBBoard();
                board[i - j].url = options[i].OuterHtml.Split('=')[1].Split('>')[0];
                board[i - j].name = n;
            }
        }

 protected bool GetTableColumnValueFromHtmlDocument(HtmlDocument doc, string dbtable, string dbcolumn, ref object result)
 {
     foreach (string str in WebBrowserExtensions.tags)
     {
         HtmlElementCollection elementsByTagName = doc.GetElementsByTagName(str);
         foreach (HtmlElement element in elementsByTagName)
         {
             string attribute = element.GetAttribute("dbtable");
             string str3 = element.GetAttribute("dbcolumn");
             if (((!string.IsNullOrEmpty(attribute) && !string.IsNullOrEmpty(dbcolumn)) && (attribute == dbtable)) && (str3 == dbcolumn))
             {
                 result = element.GetAttribute("value");
                 return true;
             }
         }
     }
     return false;
 }

        public override void Process(HtmlDocument doc)
        {
            Processed = true;

            HtmlElement details = null;
            bool hasAddress = false;
            bool hasDetails = false;
            foreach (HtmlElement div in doc.GetElementsByTagName("div"))
            {
                String cn = div.GetAttribute("className");
                if (cn == "cop_address")
                {
                    Address = div.InnerText;
                    hasAddress = true;
                }
                else if (cn == "cop_contact_inf")
                {
                    details = div;
                    hasDetails = true;
                }
                if (hasAddress && hasDetails)
                    break;
            }

            // process details
            foreach (HtmlElement li in details.GetElementsByTagName("li"))
            {
                String cname = li.FirstChild.GetAttribute("className");
                if (cname == "call_i")
                {
                    Phones.Add(li.Children[1].InnerText.Trim());
                }
                else if (cname == "web_i")
                {
                    Sites.Add(li.Children[1].InnerText.Trim());
                }
                else
                {
                    MessageBox.Show(Url.ToString() + ": " + cname);
                }
            }

            // coordinates
            MatchCollection matches = Regex.Matches(doc.Body.InnerHtml, "google\\.maps\\.LatLng\\((.*?)\\)");
            if (matches.Count > 0)
            {
                Coords = matches[0].Groups[1].Value;
            }
        }