Add project files.

Beam.Dynamic/ListContentDataProvider.cs

@@ -0,0 +1,31 @@
+using HtmlAgilityPack;
+using System.Text;
+
+namespace Beam.Dynamic {
+    public class ListContentDataProvider : IDataProvider {
+        public Binding? Content { get; set; }
+
+        public string Get(HtmlDocument document) {
+            if (Content is null)
+                return "";
+
+            var node = Content.ResolveNode(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();
+        }
+
+        public HtmlNode? GetNode(HtmlDocument document) {
+            return Content?.ResolveNode(document);
+        }
+    }
+}