From 7fd0bf77f5d48bca8530d0770c15c62383270080 Mon Sep 17 00:00:00 2001
From: vchirikov <vchirikov@servicetitan.com>
Date: Tue, 10 Nov 2020 15:44:11 +0300
Subject: [PATCH] Do not box List's enumerator

---
 .../Collections/CollectionBaseSlim.cs          | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/Orm/Xtensive.Orm/Collections/CollectionBaseSlim.cs b/Orm/Xtensive.Orm/Collections/CollectionBaseSlim.cs
index e7f41a6d97..64a2c213ee 100644
--- a/Orm/Xtensive.Orm/Collections/CollectionBaseSlim.cs
+++ b/Orm/Xtensive.Orm/Collections/CollectionBaseSlim.cs
@@ -168,16 +168,18 @@ public virtual void CopyTo(TItem[] array, int arrayIndex)
 
     /// <inheritdoc/>
     [DebuggerStepThrough]
-    IEnumerator IEnumerable.GetEnumerator()
-    {
-      return GetEnumerator();
-    }
+    public List<TItem>.Enumerator GetEnumerator()
+      => items.GetEnumerator();
 
     /// <inheritdoc/>
-    public virtual IEnumerator<TItem> GetEnumerator()
-    {
-      return Items.GetEnumerator();
-    }
+    [DebuggerStepThrough]
+    IEnumerator<TItem> IEnumerable<TItem>.GetEnumerator()
+      => items.GetEnumerator();
+    
+    /// <inheritdoc/>
+    [DebuggerStepThrough]
+    IEnumerator IEnumerable.GetEnumerator()
+      => items.GetEnumerator();
 
     #endregion