Dealing with PITA Singletons that aren't thread safe.

pita-singletons.cs

public class MyService
{
	private Func<IDep1> Dep1Factory;
	private Func<IDep2> Dep2Factory;
	
	IDep1 Dep1 { get { return Dep1Factory(); } }
	IDep2 Dep2 { get { return Dep2Factory(); } }
	
	public MyService()
	{
		// Default ctor, required by runtime
		// Set up how we are going to retrieve the instances
		Dep1Factory = () => ServiceLocator.Get<IDep1>();
		Dep2Factory = () => ServiceLocator.Get<IDep2>();
		
		// If the Singleton is not thread-safe, then you can tell your IoC container
		// (which is called by the Service Locator) to mark it in current thread/request scope.
	}
	
	public MyService(IDep1 dep1, IDep2 dep2)
	{
		Dep1Factory = () => dep1;
		Dep2Factory = () => dep2;
	}
	
	public SomeMethodUsingDeps()
	{
		Dep1.DoSomething();
		Dep2.DoSomethingElse();
	}
}