Reinstating .None(IEnumerable<T>) method to fix dictionary mapping

Author: SteveWilkes

AgileMapper/DataSources/DictionaryEntryVariablePair.cs

@@ -18,11 +18,6 @@ internal class DictionaryEntryVariablePair
             .First(m => (m.Name == "FirstOrDefault") && (m.GetParameters().Length == 2))
             .MakeGenericMethod(typeof(string));
 
-        private static readonly MethodInfo _enumerableNoneMethod = typeof(EnumerableExtensions)
-            .GetPublicStaticMethods()
-            .First(m => (m.Name == "None") && (m.GetParameters().Length == 2))
-            .MakeGenericMethod(typeof(string));
-
         private static readonly MethodInfo _stringStartsWithMethod = typeof(string)
             .GetPublicInstanceMethods()
             .First(m => (m.Name == "StartsWith") && (m.GetParameters().Length == 2));
@@ -134,7 +129,7 @@ public Expression GetNoKeysWithMatchingStartQuery(Expression targetMemberKey)
                 targetMemberKey,
                 (keyParameter, targetKey) => GetKeyStartsWithCall(keyParameter, targetKey, StringComparison.Ordinal),
                 (keyParameter, targetKey) => GetKeyStartsWithCall(keyParameter, targetKey, StringComparison.OrdinalIgnoreCase),
-                _enumerableNoneMethod);
+                EnumerableExtensions.EnumerableNoneMethod);
 
             return noKeysStartWithTarget;
         }

AgileMapper/Extensions/EnumerableExtensions.cs

@@ -5,9 +5,16 @@
     using System.Diagnostics;
     using System.Linq;
     using System.Linq.Expressions;
+    using System.Reflection;
+    using NetStandardPolyfills;
 
     internal static class EnumerableExtensions
     {
+        public static readonly MethodInfo EnumerableNoneMethod = typeof(EnumerableExtensions)
+            .GetPublicStaticMethods()
+            .First(m => (m.Name == "None") && (m.GetParameters().Length == 2))
+            .MakeGenericMethod(typeof(string));
+
         public static void AddUnlessNullOrEmpty(this ICollection<Expression> items, Expression item)
         {
             if ((item != null) && (item != Constants.EmptyExpression))
@@ -43,6 +50,11 @@ public static T First<T>(this IList<T> items, Func<T, bool> predicate)
         [DebuggerStepThrough]
         public static bool None<T>(this ICollection<T> items) => items.Count == 0;
 
+        public static bool None<T>(this IEnumerable<T> items, Func<T, bool> predicate)
+        {
+            return items.All(item => !predicate.Invoke(item));
+        }
+
         public static bool None<T>(this IList<T> items, Func<T, bool> predicate)
         {
             for (int i = 0, n = items.Count; i < n; i++)