Imported Upstream version 1.0.0.9910upstream/1.0.0.9910

1 files changed, 8 insertions, 4 deletions

diff --git a/src/mscorlib/src/System/Collections/Generic/List.cs b/src/mscorlib/src/System/Collections/Generic/List.cs
index 3e2947f5f9..362e26599d 100644
--- a/src/mscorlib/src/System/Collections/Generic/List.cs
+++ b/src/mscorlib/src/System/Collections/Generic/List.cs
@@ -20,7 +20,6 @@ namespace System.Collections.Generic {
     using System.Diagnostics;
     using System.Diagnostics.Contracts;
     using System.Collections.ObjectModel;
-    using System.Security.Permissions;
 
     // Implements a variable-size List that uses an array of objects to store the
     // elements. A List has a capacity, which is the allocated length
@@ -927,7 +926,9 @@ namespace System.Collections.Generic {
                 ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidOffLen);
             Contract.EndContractBlock();
 
-            Array.Reverse(_items, index, count);
+            if (count > 1) {
+                Array.Reverse(_items, index, count);
+            }
             _version++;
         }
         
@@ -966,7 +967,9 @@ namespace System.Collections.Generic {
                 ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidOffLen);
             Contract.EndContractBlock();
 
-            Array.Sort<T>(_items, index, count, comparer);
+            if (count > 1) {
+                Array.Sort<T>(_items, index, count, comparer);
+            }
             _version++;
         }
 
@@ -976,9 +979,10 @@ namespace System.Collections.Generic {
             }
             Contract.EndContractBlock();
 
-            if( _size > 0) {
+            if (_size > 1) {
                 ArraySortHelper<T>.Sort(_items, 0, _size, comparison);
             }
+            _version++;
         }
 
         // ToArray returns an array containing the contents of the List.