HtmlParser.NET examples

    HtmlParser.NET at sourceforge, the project code is licensed under the Common Public License.
    example code:using System;
using System.IO;
using Winista.Text.HtmlParser;
using Winista.Text.HtmlParser.Lex;
using Winista.Text.HtmlParser.Util;
using Winista.Text.HtmlParser.Tags;

private void button1_Click(object sender, EventArgs e)
{
    //we can use the stream to load a html file from the local disk
    // or use the uri to load a web page from the internet
    //byte[] htmlBytes = Encoding.UTF8.GetBytes(this.textBox1.Text);
    //MemoryStream memsteam = new MemoryStream(htmlBytes);
    //InputStreamSource input = new InputStreamSource(memsteam, "utf-8");
    //Page page = new Page(input);
    //Lexer lex = new Lexer(page);

    if (this.textBox1.Text.Length <= 0)
        return;
    //here I read the html from the textbox
    Lexer lexer = new Lexer(this.textBox1.Text);
    Parser parser = new Parser(lexer);
    NodeList htmlNodes = parser.Parse(null);
    this.treeView1.Nodes.Clear();
    this.treeView1.Nodes.Add("root");
    TreeNode treeRoot = this.treeView1.Nodes[0];
    for (int i = 0; i < htmlNodes.Count; i++)
    {
        this.RecursionHtmlNode(treeRoot, htmlNodes[i], false);
    }
}

private void RecursionHtmlNode(TreeNode treeNode, INode htmlNode, bool siblingRequired)
{
    if (htmlNode == null || treeNode == null) return;

    TreeNode current = treeNode;
    //current node
    if (htmlNode is ITag)
    {
        ITag tag=(htmlNode as ITag);
        if (!tag.IsEndTag())
        {
            string nodeString = tag.TagName;
            if (tag.Attributes != null && tag.Attributes.Count > 0)
            {
                if (tag.Attributes["ID"] != null)
                    nodeString = nodeString + " { id=\"" + tag.Attributes["ID"].ToString() + "\" }";
                if (tag.Attributes["CLASS"] != null)
                    nodeString = nodeString + " { class=\"" + tag.Attributes["CLASS"].ToString() + "\" }";
                if (tag.Attributes["STYLE"] != null)
                    nodeString = nodeString + " { style=\"" + tag.Attributes["STYLE"].ToString() + "\" }";
                if (tag.Attributes["HREF"] != null)
                    nodeString = nodeString + " { href=\"" + tag.Attributes["HREF"].ToString() + "\" }";
            }
            current = new TreeNode(nodeString);
            treeNode.Nodes.Add(current);
        }
    }

    //the children nodes
    if (htmlNode.Children!=null && htmlNode.Children.Count > 0)
    {
        this.RecursionHtmlNode(current, htmlNode.FirstChild, true);
    }

    //the sibling nodes
    if (siblingRequired)
    {
        INode sibling = htmlNode.NextSibling;
        while (sibling != null)
        {
            this.RecursionHtmlNode(treeNode, sibling, false);
            sibling = sibling.NextSibling;
        }
    }
}

    screen snapshot for the example:
   
    The fault tolerance of the parser is very good, as shown in the pic below (although it could do this more intelligently, I really think that's enough for use):