Added comparer to AbpListExtensions.SortByDependencies method

framework/src/Volo.Abp.Core/System/Collections/Generic/AbpListExtensions.cs

@@ -188,18 +188,22 @@ namespace System.Collections.Generic
         /// <typeparam name="T">The type of the members of values.</typeparam>
         /// <param name="source">A list of objects to sort</param>
         /// <param name="getDependencies">Function to resolve the dependencies</param>
+        /// <param name="comparer">Equality comparer for dependencies </param>
         /// <returns>
         /// Returns a new list ordered by dependencies.
         /// If A depends on B, then B will come before than A in the resulting list.
         /// </returns>
-        public static List<T> SortByDependencies<T>(this IEnumerable<T> source, Func<T, IEnumerable<T>> getDependencies)
+        public static List<T> SortByDependencies<T>(
+            this IEnumerable<T> source, 
+            Func<T, IEnumerable<T>> getDependencies,
+            IEqualityComparer<T> comparer = null)
         {
             /* See: http://www.codeproject.com/Articles/869059/Topological-sorting-in-Csharp
              *      http://en.wikipedia.org/wiki/Topological_sorting
              */
 
             var sorted = new List<T>();
-            var visited = new Dictionary<T, bool>();
+            var visited = new Dictionary<T, bool>(comparer);
 
             foreach (var item in source)
             {