From e1ec242ff0299c358fddad1c19c69add318ee874 Mon Sep 17 00:00:00 2001
From: Lev Nachmanson <levnach@hotmail.com>
Date: Tue, 16 Jul 2024 18:01:59 -0700
Subject: [PATCH] accept faillure of SortedDictionary.operator[int] when the
 key is not present.

---
 GraphLayout/Drawing/Graph.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/GraphLayout/Drawing/Graph.cs b/GraphLayout/Drawing/Graph.cs
index 2efece5b..59615f4e 100644
--- a/GraphLayout/Drawing/Graph.cs
+++ b/GraphLayout/Drawing/Graph.cs
@@ -321,7 +321,9 @@ public void AddPrecalculatedEdge(Edge edge) {
         /// <param name="nodeId"></param>
         /// <returns></returns>
         public Node FindNode(string nodeId) {
-            return nodeMap[nodeId] as Node;
+            if (nodeMap.TryGetValue(nodeId, out Node n))
+                return n;
+            return null;
         }
 
         /// <summary>
@@ -332,7 +334,8 @@ public Microsoft.Msagl.Core.Layout.Node FindGeometryNode(string nodeId)
         {
             if (GeometryGraph != null)
             {
-                Node node = nodeMap[nodeId] as Node;
+
+                nodeMap.TryGetValue(nodeId, out Node node);
                 if (node != null)
                 {
                     return GeometryGraph.FindNodeByUserData(node);