yep

Gameboard.ShogiUI.UnitTests/PathFinding/TestPlanarCollection.cs

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+using PathFinding;
+using System.Collections;
+using System.Collections.Generic;
+using System.Numerics;
+
+namespace Gameboard.ShogiUI.UnitTests.PathFinding
+{
+  public class SimpleElement : IPlanarElement
+  {
+    public int Number { get; }
+    public MoveSet MoveSet => null;
+    public bool IsUpsideDown => false;
+
+    public SimpleElement(int number)
+    {
+      Number = number;
+    }
+  }
+
+  public class TestPlanarCollection : IPlanarCollection<SimpleElement>
+  {
+    private readonly SimpleElement[,] array;
+    public TestPlanarCollection()
+    {
+      array = new SimpleElement[3, 3];
+    }
+    public SimpleElement this[int x, int y]
+    {
+      get => array[x, y];
+      set => array[x, y] = value;
+    }
+    public SimpleElement this[Vector2 vector]
+    {
+      get => this[(int)vector.X, (int)vector.Y];
+      set => this[(int)vector.X, (int)vector.Y] = value;
+    }
+
+    public IEnumerator<SimpleElement> GetEnumerator()
+    {
+      foreach (var e in array)
+        yield return e;
+    }
+    //IEnumerator IEnumerable.GetEnumerator()
+    //{
+    //  return array.GetEnumerator();
+    //}
+  }
+}