Added the possibility to register classes not implementing any interface, fixed incorrect way to get classes from namespace

src/Dependify.Test/AutoRegisterTestCases.cs

@@ -27,6 +27,21 @@ namespace ShouldRegisterSingleton {
     public class ImplementationSingleton : IInterface { }
 }
 
+namespace ShouldRegisterTransientWithoutInterface {
+    [RegisterTransient]
+    public class ImplementationTransientWithoutInterface { }
+}
+
+namespace ShouldRegisterScopedWithoutInterface {
+    [RegisterScoped]
+    public class ImplementationScopedWithoutInterface { }
+}
+
+namespace ShouldRegisterSingletonWithoutInterface {
+    [RegisterSingleton]
+    public class ImplementationSingletonWithoutInterface { }
+}
+
 namespace ShouldRegisterOneTransient {
     [RegisterTransient(typeof(IInterface2))]
     public class ImplementationTransientOneInterface : IInterface, IInterface2 { }

src/Dependify.Test/AutoRegisterTests.cs

@@ -11,8 +11,11 @@ using ShouldRegisterOneScoped;
 using ShouldRegisterOneSingleton;
 using ShouldRegisterOneTransient;
 using ShouldRegisterScoped;
+using ShouldRegisterScopedWithoutInterface;
 using ShouldRegisterSingleton;
+using ShouldRegisterSingletonWithoutInterface;
 using ShouldRegisterTransient;
+using ShouldRegisterTransientWithoutInterface;
 
 namespace Dependify.Test {
     [TestFixture]
@@ -20,6 +23,9 @@ namespace Dependify.Test {
         [TestCase(nameof(ShouldRegisterTransient), typeof(ImplementationTransient), typeof(IInterface), ServiceLifetime.Transient)]
         [TestCase(nameof(ShouldRegisterSingleton), typeof(ImplementationSingleton), typeof(IInterface), ServiceLifetime.Singleton)]
         [TestCase(nameof(ShouldRegisterScoped), typeof(ImplementationScoped), typeof(IInterface), ServiceLifetime.Scoped)]
+        [TestCase(nameof(ShouldRegisterTransientWithoutInterface), typeof(ImplementationTransientWithoutInterface), typeof(ImplementationTransientWithoutInterface), ServiceLifetime.Transient)]
+        [TestCase(nameof(ShouldRegisterSingletonWithoutInterface), typeof(ImplementationSingletonWithoutInterface), typeof(ImplementationSingletonWithoutInterface), ServiceLifetime.Singleton)]
+        [TestCase(nameof(ShouldRegisterScopedWithoutInterface), typeof(ImplementationScopedWithoutInterface), typeof(ImplementationScopedWithoutInterface), ServiceLifetime.Scoped)]
         [TestCase(nameof(ShouldRegisterOneTransient), typeof(ImplementationTransientOneInterface), typeof(IInterface2), ServiceLifetime.Transient)]
         [TestCase(nameof(ShouldRegisterOneSingleton), typeof(ImplementationSingletonOneInterface), typeof(IInterface2), ServiceLifetime.Singleton)]
         [TestCase(nameof(ShouldRegisterOneScoped), typeof(ImplementationScopedOneInterface), typeof(IInterface2), ServiceLifetime.Scoped)]

src/Dependify/IServiceCollectionExtensions.cs

@@ -91,7 +91,13 @@ namespace Dependify {
                 var classAttributes = classType.GetCustomAttributes<Register>(true);
                 foreach (var classAttribute in classAttributes) {
                     var registrationType = classAttribute.GetType();
-                    var interfaceTypes = classAttribute.InterfaceTypes == null || !classAttribute.InterfaceTypes.Any() ? classType.GetInterfaces() : classAttribute.InterfaceTypes;
+                    IEnumerable<Type> interfaceTypes;
+                    if (classAttribute.InterfaceTypes?.Any() ?? false)
+                        interfaceTypes = classAttribute.InterfaceTypes;
+                    else if (classType.GetInterfaces().Any())
+                        interfaceTypes = classType.GetInterfaces();
+                    else
+                        interfaceTypes = new[] { classType };
 
                     foreach (var interfaceType in interfaceTypes) {
                         if (registrationType == typeof(RegisterTransient))

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);
@@ -45,7 +45,11 @@ namespace Dependify.Utilities {
         }
 
         internal static IEnumerable<Type> GetClassTypesFromNamespace(IEnumerable<Assembly> assemblies, string @namespace) {
-            return assemblies.SelectMany(assembly => assembly.GetTypes()).Where(type => type.IsClass && (type.Namespace?.StartsWith(@namespace)).GetValueOrDefault());
+            return assemblies.SelectMany(assembly => assembly.GetTypes()).Where(type => type.IsClass && BelongsToNamespace(type.Namespace, @namespace));
         }
+
+        private static bool BelongsToNamespace(string testedNamespace, string parentNamespace)
+            => testedNamespace != null &&
+                (testedNamespace == parentNamespace || testedNamespace.StartsWith(parentNamespace + "."));
     }
 }