Parse a HTML combox in C#_问答_开发者_运维开发者技术经验分享

开发者 https://www.devze.com 2023-01-21 03:14 出处：网络

I need parse a select value in html file. I have this html file: <html> <head></head>

I need parse a select value in html file. I have this html file:

<html>
<head></head>
<body>
    <select id="region" name="region">
        <option value="0"  selected>Všetky regiony</option> 
        <optgroup>Banskobystrický kraj</optgroup>
        <option value="k_1">Banskobystrický kraj</option>
        <option value="1">Banská Bystrica</option>
        <option value="3">Banská Štiavnica</option>
        <option value="18">Brezno</option>
        <option value="22">Detva</option>
        <option value="58">Dudince</option>
    </select>
</body>
</html>

I need get select option value and also text value in dictionary. I load this file in webBrowser component a try get select tag by ID "region".

        webBrowser1.Url = new Uri("file://\\C:\\1.html");

        if (webBrowser1.Document != null)
        {
            HtmlElement elems = webBrowser1.Document.GetElementById("region");
        }

But object elems is null, I don’t why. 开发者_StackOverflow社区Any advance?

EDIT: Problem was resolved with Html Agillity Pack. Thank for everybody. I was stupid, I had rather listen to your advice with Html Agillity Pack first.

You can do it with the HtmlAgilityPack. There are many examples of using it to parsing html. You can find via a google search. Here are a few:

http://htmlagilitypack.codeplex.com/wikipage?title=Examples&referringTitle=Home

How to use HTML Agility pack

UPDATE:

While I think using the library is a better choice, you can do it with the webbrowser control in the following manner:

    webBrowser1.DocumentCompleted += 
          new WebBrowserDocumentCompletedEventHandler(ParseOptions);

    webBrowser1.Url = new Uri("C:\\1.html", UriKind.Absolute);

    private void ParseOptions(object sender,
        WebBrowserDocumentCompletedEventArgs e)
    {
        HtmlElement elems = webBrowser1.Document.GetElementById("region");
    }

Notice that the parsing is done in the DocumentCompleted event handler.

Html Agility Pack is a HTML parser great parser.