First commit

.gitignore

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+SimpleObjectFactory/bin
+SimpleObjectFactory/obj
+SimpleObjectFactory.Test/bin
+SimpleObjectFactory.Test/obj

SimpleObjectFactory.Test/ObjectFactory.cs

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+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace SimpleObjectFactory.Test
+{
+    [TestClass]
+    public class ObjectFactory
+    {
+
+        [TestMethod]
+        public void ImplementationOnly()
+        {
+
+            var serviceFactory = new SimpleObjectFactory.ObjectFactory();
+            serviceFactory.RegisterType<Implementation>();
+
+            var service = serviceFactory.GetInstance<Implementation>();
+            Assert.IsNotNull(service);
+
+        }
+
+        [TestMethod]
+        public void CorrectDerivative()
+        {
+
+            var serviceFactory = new SimpleObjectFactory.ObjectFactory();
+            serviceFactory.RegisterType<IInterface, Implementation>();
+
+            var service = serviceFactory.GetInstance<IInterface>();
+            Assert.IsNotNull(service);
+
+        }
+
+        [TestMethod]
+        public void ParameterlessCtor()
+        {
+
+            var serviceFactory = new SimpleObjectFactory.ObjectFactory();
+            serviceFactory.RegisterType<ClassWithParameterlessCtor, ClassWithParameterlessCtor>();
+
+            var service = serviceFactory.GetInstance<ClassWithParameterlessCtor>();
+            Assert.IsNotNull(service);
+
+        }
+
+        [TestMethod]
+        public void ParameterizedCtor()
+        {
+
+            var serviceFactory = new SimpleObjectFactory.ObjectFactory();
+            serviceFactory.RegisterType<ClassWithParameterlessCtor, ClassWithParameterlessCtor>();
+            serviceFactory.RegisterType<ClassWithParameterizedCtor, ClassWithParameterizedCtor>();
+
+            var service = serviceFactory.GetInstance<ClassWithParameterizedCtor>();
+            Assert.IsNotNull(service);
+            Assert.IsNotNull(service.Parent);
+
+        }
+
+        [TestMethod]
+        public void UndeclaredParameterCtor()
+        {
+
+            var serviceFactory = new SimpleObjectFactory.ObjectFactory();
+            serviceFactory.RegisterType<ClassWithParameterizedCtor, ClassWithParameterizedCtor>();
+
+            var service = serviceFactory.GetInstance<ClassWithParameterizedCtor>();
+            Assert.IsNull(service);
+
+        }
+
+        [TestMethod]
+        public void StaticInstance()
+        {
+            var expected = new Implementation();
+            var serviceFactory = new SimpleObjectFactory.ObjectFactory();
+            serviceFactory.RegisterType(expected);
+
+            var actual = serviceFactory.GetInstance<Implementation>();
+
+            Assert.IsNotNull(actual);
+            Assert.AreSame(expected, actual);
+        }
+
+        private interface IInterface
+        {
+        }
+
+        private class Implementation : IInterface
+        {
+        }
+
+        private class ClassWithParameterlessCtor
+        {
+        }
+
+        private class ClassWithParameterizedCtor
+        {
+            public ClassWithParameterlessCtor Parent { get; set; }
+
+            public ClassWithParameterizedCtor(ClassWithParameterlessCtor parent)
+            {
+                Parent = parent;
+            }
+        }
+
+    }
+}

SimpleObjectFactory.Test/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("SimpleObjectFactory.Test")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("SimpleObjectFactory.Test")]
+[assembly: AssemblyCopyright("Copyright ©  2015")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("9d500b3a-c6a3-4d58-b823-5357a6535d84")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

SimpleObjectFactory.Test/SimpleObjectFactory.Test.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{9D500B3A-C6A3-4D58-B823-5357A6535D84}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>SimpleObjectFactory.Test</RootNamespace>
+    <AssemblyName>SimpleObjectFactory.Test</AssemblyName>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <ProjectTypeGuids>{3AC096D0-A1C2-E12C-1390-A8335801FDAB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">10.0</VisualStudioVersion>
+    <VSToolsPath Condition="'$(VSToolsPath)' == ''">$(MSBuildExtensionsPath32)\Microsoft\VisualStudio\v$(VisualStudioVersion)</VSToolsPath>
+    <ReferencePath>$(ProgramFiles)\Common Files\microsoft shared\VSTT\$(VisualStudioVersion)\UITestExtensionPackages</ReferencePath>
+    <IsCodedUITest>False</IsCodedUITest>
+    <TestProjectType>UnitTest</TestProjectType>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+  </ItemGroup>
+  <Choose>
+    <When Condition="('$(VisualStudioVersion)' == '10.0' or '$(VisualStudioVersion)' == '') and '$(TargetFrameworkVersion)' == 'v3.5'">
+      <ItemGroup>
+        <Reference Include="Microsoft.VisualStudio.QualityTools.UnitTestFramework, Version=10.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
+      </ItemGroup>
+    </When>
+    <Otherwise>
+      <ItemGroup>
+        <Reference Include="Microsoft.VisualStudio.QualityTools.UnitTestFramework" />
+      </ItemGroup>
+    </Otherwise>
+  </Choose>
+  <ItemGroup>
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="ObjectFactory.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\SimpleObjectFactory\SimpleObjectFactory.csproj">
+      <Project>{58d9f88d-1877-466a-ab71-ef00ffc596a6}</Project>
+      <Name>SimpleObjectFactory</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Choose>
+    <When Condition="'$(VisualStudioVersion)' == '10.0' And '$(IsCodedUITest)' == 'True'">
+      <ItemGroup>
+        <Reference Include="Microsoft.VisualStudio.QualityTools.CodedUITestFramework, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+          <Private>False</Private>
+        </Reference>
+        <Reference Include="Microsoft.VisualStudio.TestTools.UITest.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+          <Private>False</Private>
+        </Reference>
+        <Reference Include="Microsoft.VisualStudio.TestTools.UITest.Extension, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+          <Private>False</Private>
+        </Reference>
+        <Reference Include="Microsoft.VisualStudio.TestTools.UITesting, Version=10.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+          <Private>False</Private>
+        </Reference>
+      </ItemGroup>
+    </When>
+  </Choose>
+  <Import Project="$(VSToolsPath)\TeamTest\Microsoft.TestTools.targets" Condition="Exists('$(VSToolsPath)\TeamTest\Microsoft.TestTools.targets')" />
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

SimpleObjectFactory/IObjectCreator.cs

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+namespace SimpleObjectFactory
+{
+    public interface IObjectCreator
+    {
+        object GetService(ObjectFactory factory);
+    }
+}

SimpleObjectFactory/ObjectFactory.cs

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+using System;
+using System.Collections.Generic;
+
+namespace SimpleObjectFactory
+{
+    public class ObjectFactory
+    {
+
+        private readonly Dictionary<Type, IObjectCreator> registry = new Dictionary<Type, IObjectCreator>();
+
+        public void RegisterType<TService, TImplementation>() where TImplementation : TService
+        {
+            if (!typeof(TService).IsAssignableFrom(typeof(TImplementation)))
+            {
+                throw new ArgumentException($"{typeof(TService).Name} is not assignable from {typeof(TImplementation).Name}");
+            }
+
+            if (registry.ContainsKey(typeof(TService)))
+            {
+                throw new ArgumentException($"{typeof(TService).Name} has been added previously");
+            }
+
+            registry.Add(typeof(TService), new SingletonObjectCreator<TImplementation>());
+        }
+
+        public void RegisterType<TImplementation>()
+        {
+            RegisterType<TImplementation, TImplementation>();
+        }
+
+        public void RegisterType<TImplementation>(TImplementation implementation)
+        {
+            registry.Add(typeof(TImplementation), new PrebuiltObjectCreator(implementation));
+        }
+
+        public TContract GetInstance<TContract>() where TContract : class
+        {
+            return GetInstance(typeof(TContract)) as TContract;
+        }
+
+        public object GetInstance(Type type)
+        {
+            if (registry.ContainsKey(type))
+            {
+                return registry[type].GetService(this);
+            }
+
+            return null;
+        }
+
+    }
+}

SimpleObjectFactory/PrebuiltObjectCreator.cs

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+namespace SimpleObjectFactory
+{
+    internal class PrebuiltObjectCreator : IObjectCreator
+    {
+        private readonly object instance;
+
+        public PrebuiltObjectCreator(object instance)
+        {
+            this.instance = instance;
+        }
+
+        public object GetService(ObjectFactory factory)
+        {
+            return instance;
+        }
+    }
+}

SimpleObjectFactory/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("SimpleObjectFactory")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("SimpleObjectFactory")]
+[assembly: AssemblyCopyright("Copyright ©  2015")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("58d9f88d-1877-466a-ab71-ef00ffc596a6")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]