From 3950f7741c214274245caf1833fe15cfcb38a88b Mon Sep 17 00:00:00 2001
From: Stephen Toub <stoub@microsoft.com>
Date: Tue, 19 Mar 2024 13:33:19 -0400
Subject: [PATCH] Remove duplicative sorting when enumerating OrderBy.Take/Skip

Fixes a recent perf regression on enumerating an OrderBy.Take/Skip that results in an extra sort.
---
 .../System.Linq/src/System/Linq/OrderedEnumerable.SpeedOpt.cs   | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libraries/System.Linq/src/System/Linq/OrderedEnumerable.SpeedOpt.cs b/src/libraries/System.Linq/src/System/Linq/OrderedEnumerable.SpeedOpt.cs
index e69eb734ea142..bf65a34b06efa 100644
--- a/src/libraries/System.Linq/src/System/Linq/OrderedEnumerable.SpeedOpt.cs
+++ b/src/libraries/System.Linq/src/System/Linq/OrderedEnumerable.SpeedOpt.cs
@@ -479,7 +479,7 @@ public override bool MoveNext()
                 }
                 else if (state == 1)
                 {
-                    TElement[] buffer = _source.ToArray();
+                    TElement[] buffer = _source._source.ToArray();
                     int count = buffer.Length;
                     if (count > _minIndexInclusive)
                     {