From 16a49d89aa8c834b6fbb708659ee754d96a8a590 Mon Sep 17 00:00:00 2001
From: ClemensF <fischer.clemens@gmail.com>
Date: Thu, 18 Jun 2020 18:30:57 +0200
Subject: [PATCH] Update WmtsTileLayer.cs

---
 MapControl/Shared/WmtsTileLayer.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/MapControl/Shared/WmtsTileLayer.cs b/MapControl/Shared/WmtsTileLayer.cs
index dbd3e863..f5c3db6a 100644
--- a/MapControl/Shared/WmtsTileLayer.cs
+++ b/MapControl/Shared/WmtsTileLayer.cs
@@ -195,7 +195,12 @@ namespace MapControl
                     var capabilities = await WmtsCapabilities.ReadCapabilities(CapabilitiesUri, LayerIdentifier);
 
                     TileMatrixSets.Clear();
-                    capabilities.TileMatrixSets.ForEach(s => TileMatrixSets.Add(s.SupportedCrs, s));
+
+                    foreach (var tileMatrixSet in capabilities.TileMatrixSets
+                        .Where(s => !TileMatrixSets.ContainsKey(s.SupportedCrs)))
+                    {
+                        TileMatrixSets.Add(tileMatrixSet.SupportedCrs, tileMatrixSet);
+                    }
 
                     LayerIdentifier = capabilities.LayerIdentifier;
                     TileSource = capabilities.TileSource;