* Revert the changes to TryInsert() introduced by https://github.com/dotnet/coreclr/pull/17096 completely, which only showed modest size improvement

* Removing the _version increment from Clear() entirely to bring it in line with the behavior in Remove() and to keep size gains

[tfs-changeset: 1714543]

1 files changed, 4 insertions, 2 deletions

diff --git a/src/System.Private.CoreLib/shared/System/Collections/Generic/Dictionary.cs b/src/System.Private.CoreLib/shared/System/Collections/Generic/Dictionary.cs
index bc3040771..47105651d 100644
--- a/src/System.Private.CoreLib/shared/System/Collections/Generic/Dictionary.cs
+++ b/src/System.Private.CoreLib/shared/System/Collections/Generic/Dictionary.cs
@@ -267,7 +267,6 @@ namespace System.Collections.Generic
                 _freeCount = 0;
                 Array.Clear(_entries, 0, count);
             }
-            _version++;
         }
 
         public bool ContainsKey(TKey key)
@@ -476,7 +475,6 @@ namespace System.Collections.Generic
                 ThrowHelper.ThrowArgumentNullException(ExceptionArgument.key);
             }
 
-            _version++;
             if (_buckets == null)
             {
                 Initialize(0);
@@ -511,6 +509,7 @@ namespace System.Collections.Generic
                             if (behavior == InsertionBehavior.OverwriteExisting)
                             {
                                 entries[i].value = value;
+                                _version++;
                                 return true;
                             }
 
@@ -552,6 +551,7 @@ namespace System.Collections.Generic
                             if (behavior == InsertionBehavior.OverwriteExisting)
                             {
                                 entries[i].value = value;
+                                _version++;
                                 return true;
                             }
 
@@ -590,6 +590,7 @@ namespace System.Collections.Generic
                         if (behavior == InsertionBehavior.OverwriteExisting)
                         {
                             entries[i].value = value;
+                            _version++;
                             return true;
                         }
 
@@ -647,6 +648,7 @@ namespace System.Collections.Generic
             entry.value = value;
             // Value in _buckets is 1-based
             bucket = index + 1;
+            _version++;
 
             // Value types never rehash
             if (default(TKey) == null && collisionCount > HashHelpers.HashCollisionThreshold && comparer is NonRandomizedStringEqualityComparer)