Version 4: Upgrade to VS 2017

MapControl/Shared/BingMapsTileSource.cs

@@ -0,0 +1,39 @@
+// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
+// © 2017 Clemens Fischer
+// Licensed under the Microsoft Public License (Ms-PL)
+
+using System;
+
+namespace MapControl
+{
+    public class BingMapsTileSource : TileSource
+    {
+        private readonly string[] subdomains;
+
+        public BingMapsTileSource(string uriFormat, string[] subdomains)
+            : base(uriFormat)
+        {
+            this.subdomains = subdomains;
+        }
+
+        public override Uri GetUri(int x, int y, int zoomLevel)
+        {
+            if (zoomLevel < 1)
+            {
+                return null;
+            }
+
+            var subdomain = subdomains[(x + y) % subdomains.Length];
+            var quadkey = new char[zoomLevel];
+
+            for (var z = zoomLevel - 1; z >= 0; z--, x /= 2, y /= 2)
+            {
+                quadkey[z] = (char)('0' + 2 * (y % 2) + (x % 2));
+            }
+
+            return new Uri(UriFormat
+                .Replace("{subdomain}", subdomain)
+                .Replace("{quadkey}", new string(quadkey)));
+        }
+    }
+}