holger/SmallInjectorDemo
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Holger Boerchers 2018-08-12 13:23:44 +02:00
parent 59307bf28e
commit 7326ff6684
10 changed files with 253 additions and 0 deletions
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28
.vscode/launch.json vendored Normal file
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{
// Use IntelliSense to find out which attributes exist for C# debugging
// Use hover for the description of the existing attributes
// For further information visit https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md
"version": "0.2.0",
"configurations": [
{
"name": ".NET Core Launch (console)",
"type": "coreclr",
"request": "launch",
"preLaunchTask": "build",
// If you have changed target frameworks, make sure to update the program path.
"program": "${workspaceFolder}/bin/Debug/netcoreapp2.1/Playground.dll",
"args": [],
"cwd": "${workspaceFolder}",
// For more information about the 'console' field, see https://github.com/OmniSharp/omnisharp-vscode/blob/master/debugger-launchjson.md#console-terminal-window
"console": "internalConsole",
"stopAtEntry": false,
"internalConsoleOptions": "openOnSessionStart"
},
{
"name": ".NET Core Attach",
"type": "coreclr",
"request": "attach",
"processId": "${command:pickProcess}"
}
,]
}

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.vscode/tasks.json vendored Normal file
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{
"version": "2.0.0",
"tasks": [
{
"label": "build",
"command": "dotnet",
"type": "process",
"args": [
"build",
"${workspaceFolder}/Playground.csproj"
],
"problemMatcher": "$msCompile"
}
]
}

28
Program.cs Normal file
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using System;
namespace Playground
{
internal static class Program
{
private static void Main()
{
Console.WriteLine("Small dependency injection example.");
var injector = new SmallInjector();
injector.RegisterType<ServiceOne, IServiceOne>(true);
injector.RegisterType<ServiceTwo, IServiceTwo>(true);
injector.RegisterType<UsefulClass>(false);
Console.WriteLine();
Console.WriteLine("Resolve class instances.");
var useful1 = injector.Resolve<UsefulClass>();
var useful2 = injector.Resolve<UsefulClass>();
var useful3 = injector.Resolve<UsefulClass>();
Console.WriteLine();
Console.WriteLine("Run test methods.");
useful1.TestTheServices();
useful2.TestTheServices();
useful3.TestTheServices();
Console.ReadLine();
}
}
}

17
RegisteredType.cs Normal file
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using System;
namespace Playground
{
public class RegisteredType
{
public RegisteredType(Type concreteType, bool isSingleton)
{
ConcreteType = concreteType;
IsSingleton = isSingleton;
}
public readonly bool IsSingleton;
public readonly Type ConcreteType;
public object SingletonInstance { get; set; }
}
}

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ServiceOne.cs Normal file
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using System;
namespace Playground
{
public class ServiceOne : IServiceOne
{
private readonly Guid _guid;
public ServiceOne()
{
_guid = Guid.NewGuid();
Console.WriteLine(nameof(ServiceOne) + ".ctor\t\tId: " + _guid);
}
public override string ToString() => nameof(ServiceOne) + ".ToString()\tId: " + _guid;
}
public interface IServiceOne
{
}
}

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ServiceTwo.cs Normal file
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using System;
namespace Playground
{
public class ServiceTwo : IServiceTwo
{
private readonly Guid _guid;
public ServiceTwo()
{
_guid = Guid.NewGuid();
Console.WriteLine(nameof(ServiceTwo) + ".ctor\t\tId: " + _guid);
}
public override string ToString() => nameof(ServiceTwo) + ".ToString()\tId: " + _guid;
}
public interface IServiceTwo
{
}
}

47
SmallInjector.cs Normal file
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
namespace Playground
{
public class SmallInjector
{
private readonly Dictionary<Type, RegisteredType> _container = new Dictionary<Type, RegisteredType>();
public void RegisterType<TService, TInterface>(bool isSingleton)
{
_container.Add(typeof(TInterface), new RegisteredType(typeof(TService), isSingleton));
}
public void RegisterType<TService>(bool isSingleton) => RegisterType<TService, TService>(isSingleton);
public TService Resolve<TService>() => (TService)Resolve(typeof(TService));
public object Resolve(Type serviceInterface)
{
if (!_container.TryGetValue(serviceInterface, out var registeredType))
{
throw new Exception("Can't resolve dependency " + serviceInterface);
}
if (registeredType.IsSingleton && registeredType.SingletonInstance != null)
return registeredType.SingletonInstance;
var constructor = registeredType.ConcreteType.GetConstructors()[0];
var parameters = constructor.GetParameters();
var constructorParameters = new object[parameters.Length];
for (var i = 0; i < parameters.Length; i++)
{
constructorParameters[i] = Resolve(parameters[i].ParameterType);
}
if (registeredType.IsSingleton)
{
return registeredType.SingletonInstance ?? (registeredType.SingletonInstance = constructor.Invoke(constructorParameters));
}
return constructor.Invoke(constructorParameters);
}
}
}

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SmallInjectorDemo.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>netcoreapp2.1</TargetFramework>
<AssemblyName>SmallInjectorDemo</AssemblyName>
<RootNamespace>SmallInjectorDemo</RootNamespace>
</PropertyGroup>
</Project>

37
SmallInjectorDemo.sln Normal file
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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 15
VisualStudioVersion = 15.0.26124.0
MinimumVisualStudioVersion = 15.0.26124.0
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "SmallInjectorDemo", "SmallInjectorDemo.csproj", "{620CC001-7DF9-4233-AFC2-187FD9144835}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Debug|x64 = Debug|x64
Debug|x86 = Debug|x86
Release|Any CPU = Release|Any CPU
Release|x64 = Release|x64
Release|x86 = Release|x86
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{620CC001-7DF9-4233-AFC2-187FD9144835}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{620CC001-7DF9-4233-AFC2-187FD9144835}.Debug|Any CPU.Build.0 = Debug|Any CPU
{620CC001-7DF9-4233-AFC2-187FD9144835}.Debug|x64.ActiveCfg = Debug|Any CPU
{620CC001-7DF9-4233-AFC2-187FD9144835}.Debug|x64.Build.0 = Debug|Any CPU
{620CC001-7DF9-4233-AFC2-187FD9144835}.Debug|x86.ActiveCfg = Debug|Any CPU
{620CC001-7DF9-4233-AFC2-187FD9144835}.Debug|x86.Build.0 = Debug|Any CPU
{620CC001-7DF9-4233-AFC2-187FD9144835}.Release|Any CPU.ActiveCfg = Release|Any CPU
{620CC001-7DF9-4233-AFC2-187FD9144835}.Release|Any CPU.Build.0 = Release|Any CPU
{620CC001-7DF9-4233-AFC2-187FD9144835}.Release|x64.ActiveCfg = Release|Any CPU
{620CC001-7DF9-4233-AFC2-187FD9144835}.Release|x64.Build.0 = Release|Any CPU
{620CC001-7DF9-4233-AFC2-187FD9144835}.Release|x86.ActiveCfg = Release|Any CPU
{620CC001-7DF9-4233-AFC2-187FD9144835}.Release|x86.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {1A146B09-F1B0-4A1E-B396-739788B6A68E}
EndGlobalSection
EndGlobal

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UsefulClass.cs Normal file
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using System;
namespace Playground
{
public class UsefulClass
{
private readonly IServiceOne _service;
private readonly IServiceTwo _service2;
private readonly Guid _guid;
public UsefulClass(IServiceOne service, IServiceTwo service2)
{
_service = service;
_service2 = service2;
_guid = Guid.NewGuid();
Console.WriteLine(nameof(UsefulClass) + ".ctor\tId: " + _guid);
}
public void TestTheServices()
{
Console.WriteLine(ToString());
Console.WriteLine(_service.ToString());
Console.WriteLine(_service2.ToString());
}
public override string ToString() => nameof(UsefulClass) + ".ToString()\tId: " + _guid;
}
}