Updated demos.

demo/csharp/Program.cs

@@ -0,0 +1,65 @@
+#nullable enable
+
+using System.Linq;
+using Hediet.DebugVisualizer.ExtractedData;
+
+namespace Demo
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var list = new LinkedList<int>();
+            // visualize `list.Visualize()` here!
+            list.Append(1);
+            list.Append(2);
+            list.Append(3);
+            list.Append(4);
+        }
+    }
+
+    class LinkedList<T>
+    {
+        class Node
+        {
+            public Node(T value) { Value = value; }
+            public T Value { get; set; }
+            public Node? Next { get; set; }
+        }
+
+        private Node? Head { get; set; }
+
+        public void Append(T item)
+        {
+            if (this.Head == null)
+            {
+                this.Head = new Node(item);
+            }
+            else
+            {
+                var cur = this.Head;
+                while (cur.Next != null)
+                {
+                    cur = cur.Next;
+                }
+                cur.Next = new Node(item);
+            }
+        }
+
+        public ExtractedData Visualize()
+        {
+            var list = new Node(default(T)!) { Next = this.Head };
+            return GraphData.From(new[] { list }.Where(i => i != null), (item, info) =>
+            {
+                info.Id = item == list ? "List" : string.Format("{0}", item.Value);
+                if (item == list)
+                {
+                    info.Color = "orange";
+                }
+                if (item.Next != null)
+                    info.AddEdge(item.Next!, label: item == list ? "head" : "next");
+                return info;
+            });
+        }
+    }
+}