Merge pull request grumpydev#40 from richardhopton/Tests/UsingConstructorFromAnotherType

Add check for incorrect constructor used

Author: niemyjski

src/TinyIoC.Tests/TinyIoCFunctionalTests.cs

@@ -80,6 +80,16 @@ public void NestedClassDependencies_CorrectlyRegistered_ResolvesRoot()
             Assert.IsInstanceOfType(result, typeof(NestedClassDependencies.RootClass));
         }
 
+        [TestMethod]
+        public void NestedClassDependencies_UsingConstructorFromAnotherType_ThrowsException()
+        {
+            var container = UtilityMethods.GetContainer();
+            var registerOptions = container.Register<NestedClassDependencies.RootClass>();
+
+            AssertHelper.ThrowsException<TinyIoCConstructorResolutionException>
+                (() => registerOptions.UsingConstructor(() => new RootClass(null, null)));
+        }
+
         [TestMethod]
         public void NestedClassDependencies_MissingService3Registration_ResolvesRootResolutionOn()
         {

src/TinyIoC/TinyIoC.cs

@@ -1203,6 +1203,9 @@ public RegisterOptions WithStrongReference()
 #if EXPRESSIONS
             public RegisterOptions UsingConstructor<RegisterType>(Expression<Func<RegisterType>> constructor)
             {
+                if(!IsValidAssignment(_Registration.Type, typeof(RegisterType)))
+                    throw new TinyIoCConstructorResolutionException(typeof(RegisterType));
+
                 var lambda = constructor as LambdaExpression;
                 if (lambda == null)
                     throw new TinyIoCConstructorResolutionException(typeof(RegisterType));