Apply 9dc360146f373e64b2b8801a4284938759bc5229 to all where methods

1 files changed, 14 insertions, 1 deletions

diff --git a/mcs/class/System.Core/System.Linq/Enumerable.cs b/mcs/class/System.Core/System.Linq/Enumerable.cs
index 035374cdaae..71f392690a4 100644
--- a/mcs/class/System.Core/System.Linq/Enumerable.cs
+++ b/mcs/class/System.Core/System.Linq/Enumerable.cs
@@ -3133,10 +3133,14 @@ namespace System.Linq
 		{
 			Check.SourceAndPredicate (source, predicate);
 
+			var array = source as TSource[];
+			if (array != null)
+				return CreateWhereIterator (array, predicate);
+
 			return CreateWhereIterator (source, predicate);
 		}
 
-		static IEnumerable<TSource> CreateWhereIterator<TSource> (this IEnumerable<TSource> source, Func<TSource, int, bool> predicate)
+		static IEnumerable<TSource> CreateWhereIterator<TSource> (IEnumerable<TSource> source, Func<TSource, int, bool> predicate)
 		{
 			int counter = 0;
 			foreach (TSource element in source) {
@@ -3146,6 +3150,15 @@ namespace System.Linq
 			}
 		}
 
+		static IEnumerable<TSource> CreateWhereIterator<TSource> (TSource[] source, Func<TSource, int, bool> predicate)
+		{
+			for (int i = 0; i < source.Length; ++i) {
+				var element = source [i];
+				if (predicate (element, i))
+					yield return element;
+			}
+		}
+
 		#endregion
 
 		internal static ReadOnlyCollection<TSource> ToReadOnlyCollection<TSource> (this IEnumerable<TSource> source)