Beam/Beam.Dynamic/ListContentDataProvider.cs

using HtmlAgilityPack;
using System.Text;

namespace Beam.Dynamic {
    public class ListContentDataProvider : IDataProvider<string> {
        public IBinding? Content { get; set; }

        public string Get(HtmlDocument document) {
            if (Content is null)
                return "";

            var node = Content.Select(document);
            if (node is null)
                return "";

            StringBuilder content = new();
            foreach(var childNode in node.ChildNodes.SkipLast(1)) {
                if (childNode.Name != "li")
                    continue;
                content.Append(childNode.InnerText.Trim() + ";");
            }

            content.Append(node.ChildNodes.Last().InnerText.Trim());
            return content.ToString();
        }
    }
}