diff --git a/src/Dependify/IAssemblyResolver.cs b/src/Dependify/IAssemblyResolver.cs
new file mode 100644
index 0000000..21d59ae
--- /dev/null
+++ b/src/Dependify/IAssemblyResolver.cs
@@ -0,0 +1,17 @@
+using System.Collections.Generic;
+using System.Reflection;
+using Dependify.Attributes;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Dependify {
+    /// <summary>
+    /// Specifies a resolver that knows how to locate assemblies that will be scanned for registration in <see cref="IServiceCollection"/>.
+    /// </summary>
+    public interface IAssemblyResolver {
+        /// <summary>
+        /// Returns assemblies that will be scanned for <see cref="Register"/> and <see cref="RegisterFactory"/> attributes.
+        /// </summary>
+        /// <returns>Collection of assemblies.</returns>
+        IEnumerable<Assembly> Resolve();
+    }
+}
\ No newline at end of file
diff --git a/src/Dependify/IServiceCollectionExtensions.cs b/src/Dependify/IServiceCollectionExtensions.cs
index 10b979a..9a0c0df 100644
--- a/src/Dependify/IServiceCollectionExtensions.cs
+++ b/src/Dependify/IServiceCollectionExtensions.cs
@@ -14,19 +14,23 @@ namespace Dependify {
     // ReSharper disable once InconsistentNaming
     public static class IServiceCollectionExtensions {
         /// <summary>
-        /// Adds all classes with <see cref="RegisterScoped"/>, <see cref="RegisterSingleton"/> or <see cref="RegisterTransient"/> attribute to <see cref="IServiceCollection"/>.
+        /// Adds all classes and factory methods with <see cref="RegisterScoped"/>, 
+        /// <see cref="RegisterSingleton"/> or <see cref="RegisterTransient"/> attribute for classes
+        /// and <see cref="RegisterScopedFactory"/>, <see cref="RegisterSingletonFactory"/> or <see cref="RegisterTransientFactory"/> for 
+        /// factory methods to <see cref="IServiceCollection"/>.
         /// </summary>
         /// <param name="services">Service collection.</param>
         /// <returns>Service collection.</returns>
         public static IServiceCollection AutoRegister(this IServiceCollection services) {
             var assemblies = AppDomain.CurrentDomain.GetAssemblies();
-            services.AddFactories(DependifyUtils.GetFactoryMethods(assemblies));
-            services.AddClasses(DependifyUtils.GetClassTypes(assemblies));
-            return services;
+            return services.AutoRegister(assemblies);
         }
 
         /// <summary>
-        /// Adds all classes from specified <paramref name="assemblies"/> with <see cref="RegisterScoped"/>, <see cref="RegisterSingleton"/> or <see cref="RegisterTransient"/> attribute to <see cref="IServiceCollection"/>.
+        /// Adds all classes and factory methods from specified <paramref name="assemblies"/> with <see cref="RegisterScoped"/>, 
+        /// <see cref="RegisterSingleton"/> or <see cref="RegisterTransient"/> attribute for classes
+        /// and <see cref="RegisterScopedFactory"/>, <see cref="RegisterSingletonFactory"/> or <see cref="RegisterTransientFactory"/> for 
+        /// factory methods to <see cref="IServiceCollection"/>.
         /// </summary>
         /// <param name="services">Service collection.</param>
         /// <param name="assemblies">Assemblies to scan</param>
@@ -36,12 +40,15 @@ namespace Dependify {
             services.AddClasses(DependifyUtils.GetClassTypes(assemblies));
             return services;
         }
-        
+
         /// <summary>
-        /// Adds all classes, from namespaces that start with <paramref name="namespace"/>, with <see cref="RegisterScoped"/>, <see cref="RegisterSingleton"/> or <see cref="RegisterTransient"/> attribute to <see cref="IServiceCollection"/>.
+        /// Adds all classes and factory methods, from namespaces that start with <paramref name="namespace"/>, with <see cref="RegisterScoped"/>, 
+        /// <see cref="RegisterSingleton"/> or <see cref="RegisterTransient"/> attribute for classes
+        /// and <see cref="RegisterScopedFactory"/>, <see cref="RegisterSingletonFactory"/> or <see cref="RegisterTransientFactory"/> for 
+        /// factory methods to <see cref="IServiceCollection"/>.
         /// </summary>
-        /// <param name="services"></param>
-        /// <param name="namespace"></param>
+        /// <param name="services">Service collection.</param>
+        /// <param name="namespace">Scanned namespace.</param>
         /// <returns></returns>
         public static IServiceCollection AutoRegister(this IServiceCollection services, string @namespace) {
             var assemblies = AppDomain.CurrentDomain.GetAssemblies();
@@ -50,6 +57,19 @@ namespace Dependify {
             return services;
         }
 
+        /// <summary>
+        /// Adds all classes and factory methods resolved from <paramref name="assemblyResolver"/> with <see cref="RegisterScoped"/>, 
+        /// <see cref="RegisterSingleton"/> or <see cref="RegisterTransient"/> attribute for classes
+        /// and <see cref="RegisterScopedFactory"/>, <see cref="RegisterSingletonFactory"/> or <see cref="RegisterTransientFactory"/> for 
+        /// factory methods to <see cref="IServiceCollection"/>. 
+        /// </summary>
+        /// <param name="services">Service collection.</param>
+        /// <param name="assemblyResolver">Assembly resolver.</param>
+        /// <returns></returns>
+        public static IServiceCollection AutoRegister(this IServiceCollection services, IAssemblyResolver assemblyResolver) {
+            return services.AutoRegister(assemblyResolver.Resolve().ToArray());
+        }
+
         internal static IServiceCollection AddFactories(this IServiceCollection services, IEnumerable<MethodInfo> methodInfos) {
             foreach (var methodInfo in methodInfos) {
                 var factoryAttribute = methodInfo.GetCustomAttributes<RegisterFactory>(true).First();
diff --git a/src/Dependify/Utilities/DependifyUtils.cs b/src/Dependify/Utilities/DependifyUtils.cs
index bc99eae..5eaa027 100644
--- a/src/Dependify/Utilities/DependifyUtils.cs
+++ b/src/Dependify/Utilities/DependifyUtils.cs
@@ -18,7 +18,7 @@ namespace Dependify.Utilities {
         }
 
         internal static IEnumerable<MethodInfo> GetFactoryMethodsFromNamespace(IEnumerable<Assembly> assemblies, string @namespace) {
-            return assemblies
+            return assemblies                    
                 .SelectMany(assembly => assembly.GetTypes())
                 .Where(type => type.IsClass && (type.Namespace?.StartsWith(@namespace)).GetValueOrDefault())
                 .SelectMany(MethodsWithAttribute);