From f5c64fdd09c44eb27527a235c69688fac6a69bd1 Mon Sep 17 00:00:00 2001
From: Jon Hanna <jon@hackcraft.net>
Date: Wed, 4 Jan 2017 16:20:58 +0000
Subject: [PATCH] Optimise linqbridge Select

---
 Src/Newtonsoft.Json/Utilities/LinqBridge.cs | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/Src/Newtonsoft.Json/Utilities/LinqBridge.cs b/Src/Newtonsoft.Json/Utilities/LinqBridge.cs
index 786a547b..d151069f 100644
--- a/Src/Newtonsoft.Json/Utilities/LinqBridge.cs
+++ b/Src/Newtonsoft.Json/Utilities/LinqBridge.cs
@@ -205,9 +205,18 @@ namespace Newtonsoft.Json.Utilities.LinqBridge
       this IEnumerable<TSource> source,
       Func<TSource, TResult> selector)
     {
+      CheckNotNull(source, "source");
       CheckNotNull(selector, "selector");
 
-      return source.Select((item, i) => selector(item));
+      return SelectYield(source, selector);
+    }
+
+    private static IEnumerable<TResult> SelectYield<TSource, TResult>(
+      IEnumerable<TSource> source,
+      Func<TSource, TResult> selector)
+    {
+      foreach (var item in source)
+        yield return selector(item);
     }
 
     /// <summary>