private static void TryOutSingleton()
{
Console.WriteLine($"RUNNING {nameof(TryOutSingleton)}");
ServiceCollection services = new ServiceCollection(); // 准备好我们的容器
services.AddSingleton <MyClass>(); //把MyClass注册为 Singleton 生命周期
ConcurrentBag <MyClass> bag = GetObjectsFromDI(services); // 调用我们准备好的方法，用若干线程从 IServiceProvider 中获取 MyClass 实例，并加入到集合
Console.WriteLine($"All items in collection are IDENTICAL: {bag.AreIdentical()}"); // 验证集合中的所有元素是否指向内存中的同一个对象。
}
private static void TryOutScoped()
{
Console.WriteLine($"RUNNING {nameof(TryOutScoped)}");
ServiceCollection services = new ServiceCollection();
services.AddSingleton <MySingleton>();
services.AddTransient <MyTransient>();
services.AddScoped <MyScoped>();
IServiceProvider sp = services.BuildServiceProvider();
// 线程1执行
ConcurrentBag <MySingleton> thread1SingletonBag = new ConcurrentBag <MySingleton>();
ConcurrentBag <MyTransient> thread1TransientBag = new ConcurrentBag <MyTransient>();
ConcurrentBag <MyScoped> thread1ScopedBag = new ConcurrentBag <MyScoped>();
Thread thread1 = new Thread(RunPerThreadWithScopedLifetime);
thread1.Start(new Tuple <IServiceProvider, ConcurrentBag <MySingleton>, ConcurrentBag <MyTransient>, ConcurrentBag <MyScoped> >(sp, thread1SingletonBag, thread1TransientBag, thread1ScopedBag));
// 线程2执行
ConcurrentBag <MySingleton> thread2SingletonBag = new ConcurrentBag <MySingleton>();
ConcurrentBag <MyTransient> thread2TransientBag = new ConcurrentBag <MyTransient>();
ConcurrentBag <MyScoped> thread2ScopedBag = new ConcurrentBag <MyScoped>();
Thread thread2 = new Thread(RunPerThreadWithScopedLifetime);
thread2.Start(new Tuple <IServiceProvider, ConcurrentBag <MySingleton>, ConcurrentBag <MyTransient>, ConcurrentBag <MyScoped> >(sp, thread2SingletonBag, thread2TransientBag, thread2ScopedBag));
// 等待执行完毕
thread1.Join();
thread2.Join();
// 验证所有 MySingleton 的实例都指向内存里同一个对象
IEnumerable <MySingleton> singletons = thread1SingletonBag.Concat(thread2SingletonBag);
Console.WriteLine($"Singleton: {singletons.Count()} objects are IDENTICAL? {singletons.AreIdentical()}");
// 验证所有 MyTransient 的实例都各不相同
IEnumerable <MyTransient> transients = thread1TransientBag.Concat(thread2TransientBag);
Console.WriteLine($"Transient: {transients.Count()} objects are DIFFERENT? {transients.AreDifferent()}");
// 对于Scoped生命周期，每个线程集合内的实例应该指向内存里同一个对象，而2个线程集合里的实例应该是不同的。
Console.WriteLine($"collection of thread 1 has {thread1ScopedBag.Count} objects and they are IDENTICAL: {thread1ScopedBag.AreIdentical()}");
Console.WriteLine($"collection of thread 2 has {thread2ScopedBag.Count} objects and they are IDENTICAL: {thread2ScopedBag.AreIdentical()}");
Console.WriteLine($"the first object from thread 1 and the first object from thread 2 are IDENTICAL: {Object.ReferenceEquals(thread1ScopedBag.First(), thread2ScopedBag.First())}");
}
