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Traversing ASP.NET HTML Elements using LINQ

Answer 1

A:

The easiest way to do this would be do write a regular expression to extract all the id's and then sort the list. since each element starts with <asp:, it should be pretty easy to do. If i had a bit more time i'd work out the regex.

Alex 2010-07-16 18:24:33

Answer 2

A:

You might be able to parse it.

Create temp file, add a header for whatever type of parser you want to use.

Add the html/asp code to the temp file and close it.

Parse the file using your favorite parsing library.

Cycle through the ASP nodes, adding them to a list.

Sort the list.

You could also do it with Regular Expressions.

Guy 2010-07-16 18:44:15

Answer 3

+1 A:

If you'd like to use Linq To XML, you'd have to work around the <asp:> tags and that they don't load cleanly into XML.

This code will get you what you're looking for, assuming:

you can load your ASPX markup into a string
the ASPX markup is valid XML.

The replacement of the asp: with asp- may cause trouble if you have any valid asp: content that isn't in a tag. This could be cleaned up to make it suit your needs.

  public static void Main(string[] args)
    {
        string aspxCode = @"<html><head><title>Test Page</title></head>
                            <body id=""bodyID"">        
        <asp:Label runat=""server"" id=""lbl1"" text=""First Name:"" />
        <asp:TextBox runat=""server"" id=""txt1"" /><br />
        <asp:Label runat=""server"" id=""lbl2"" text=""Last Name:"" />
        <asp:TextBox runat=""server"" id=""txt2""></asp:TextBox>
    </body>
</html>";

        XElement xDoc = XElement.Parse(aspxCode.Replace("asp:", "asp-"));

        var allMatchingASPtags = xDoc.Descendants()
               .Where(d => d.Name.LocalName.StartsWith("asp-"))
               .Select(c => c.Attribute("id").Value);

        foreach (var t in allMatchingASPtags)
        {
            Console.WriteLine(t);
        }

        Console.ReadLine();

p.campbell 2010-07-16 19:05:37

I stumbled into Linq to XML the other day and it has been a huge help!

Dillie-O 2010-07-16 19:07:14

Good solution, but I would be wary of the ASP page declaratives, e.g. <% ... %> and <%: %> etc...

Matthew Abbott 2010-07-19 08:00:08

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Traversing ASP.NET HTML Elements using LINQ

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