using System;

using System.IO;

using System.Xml;

using System.Collections;

using System.Collections.Generic;

using HtmlAgilityPack;

public class Program

{

    public static void Main()

    {

        var html =

        @"<p>今天<img alt='' src='http://localhost/survey_branch/api/fileOperation/GetCkEditorImage?filePath=images/admin/1214668322.jpg' style='height:64px; width:50px' />天氣真好<img alt='' src='http://localhost/survey_branch/api/fileOperation/GetCkEditorImage?filePath=images/admin/1214668322.jpg' style='height:64px; width:50px' />呀，對吧</p>";

        List<Tuple<string,string>> domStorage = new List<Tuple<string,string>>();

        HtmlDocument dom = new HtmlDocument();

        dom.LoadHtml(html);

        HtmlNodeCollection tagCluster = dom.DocumentNode.ChildNodes;

        if (tagCluster.Count > 1)

        {

            foreach (HtmlNode monoTag in tagCluster)

            {

                TraversalDomContent(domStorage, monoTag);

            }

        }

        else

        {

            TraversalDomContent(domStorage, tagCluster[0]);

        }

    }

    private static void TraversalDomContent(List<Tuple<string,string>> container, HtmlNode rootNode)

    {

        // Post-order Traversal

        if (!rootNode.HasChildNodes)

        {

            string nodeType = rootNode.Name;

            string nodeInformation = string.Empty;

            if ( nodeType.Equals("img") ) 

            {

                string imageSource = rootNode.GetAttributeValue("src", string.Empty);

                nodeInformation = GetImageFileName(imageSource);

            }

            else {

                nodeInformation = rootNode.InnerText;

            }

            container.Add(Tuple.Create<string, string>(nodeType, nodeInformation));

            return;

        }

        HtmlNodeCollection childCluster = rootNode.ChildNodes;

        foreach (HtmlNode monoChild in childCluster)

        {

            TraversalDomContent(container, monoChild);

        }

    }

    private static string GetImageFileName(string hrefLink)

    {

        string[] linkSplit = hrefLink.Split('=');

        string fileName = Path.GetFileName(linkSplit[1]);

        return fileName;

    }

}