creating anonymous types :)

PoweredSoft.DynamicLinq/Fluent/Group/GroupBuilder.cs

@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Linq;
+
+namespace PoweredSoft.DynamicLinq.Fluent
+{
+    public class GroupBuilder
+    {
+        public List<(string path, string propertyName)> Parts { get; set; } = new List<(string path, string propertyName)>();
+        public bool Empty => !Parts.Any();
+
+        public GroupBuilder Path(string path, string propertyName = null)
+        {
+            if (propertyName == null)
+            {
+                var name = path;
+                if (name.Contains("."))
+                {
+                    var parts = name.Split('.');
+                    name = parts[parts.Length - 1]; // the last one.
+                }
+
+                if (Parts.Any(t => t.propertyName == name))
+                    throw new Exception($"{name} is already taken by another group part, you can specify a property name instead to resolve this issue");
+
+                propertyName = name;
+            }
+
+            Parts.Add((path, propertyName));
+            return this;
+        }
+    }
+}