From a33ae696a28fb32d833b5301ee0fe6fa564299c5 Mon Sep 17 00:00:00 2001
From: Sebastiaan Janssen <sebastiaan@umbraco.com>
Date: Fri, 29 Mar 2013 08:46:09 -0100
Subject: [PATCH] Fixes U4-2014 Can't install XSLTSearch 3.0.4 with Umbraco
 6.0.3 Updated the topological sorter to only add items that exist in the
 indexes

---
 src/Umbraco.Core/TopologicalSorter.cs | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/Umbraco.Core/TopologicalSorter.cs b/src/Umbraco.Core/TopologicalSorter.cs
index 56cdc73051..b62628538a 100644
--- a/src/Umbraco.Core/TopologicalSorter.cs
+++ b/src/Umbraco.Core/TopologicalSorter.cs
@@ -131,7 +131,7 @@ namespace Umbraco.Core
             //add vertices
             for (int i = 0; i < fields.Count(); i++)
             {
-                indexes[fields[i].Alias.ToLower()] = g.AddVertex(i);
+                indexes[fields[i].Alias.ToLowerInvariant()] = g.AddVertex(i);
             }
 
             //add edges
@@ -139,10 +139,9 @@ namespace Umbraco.Core
             {
                 if (fields[i].DependsOn != null)
                 {
-                    for (int j = 0; j < fields[i].DependsOn.Length; j++)
+                    foreach (string t in fields[i].DependsOn.Where(t => indexes.ContainsKey(t.ToLowerInvariant())))
                     {
-                        g.AddEdge(i,
-                            indexes[fields[i].DependsOn[j].ToLower()]);
+                        g.AddEdge(i,indexes[t.ToLowerInvariant()]);
                     }
                 }
             }