Base & test solution

Sieve/Extensions/OrderByWithDirection.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+using System.Text;
+
+namespace Sieve.Extensions
+{
+
+    public static class LinqExtensions
+    {
+        public static IOrderedEnumerable<TSource> OrderByWithDirection<TSource, TKey>
+            (this IEnumerable<TSource> source,
+             Func<TSource, TKey> keySelector,
+             bool descending)
+        {
+            return descending ? source.OrderByDescending(keySelector)
+                              : source.OrderBy(keySelector);
+        }
+
+        public static IOrderedQueryable<TSource> OrderByWithDirection<TSource, TKey>
+            (this IQueryable<TSource> source,
+             Expression<Func<TSource, TKey>> keySelector,
+             bool descending)
+        {
+            return descending ? source.OrderByDescending(keySelector)
+                              : source.OrderBy(keySelector);
+        }
+        
+    }
+}