Dec 02, 2011
DI and IOC will complement the wcf services (whether you use Service Facade or not). But even DI/IOC is not always required. Evaluate your scenarios and choose the best fit approach
But since you mentioned your WCF services just provide an abstraction layer for your CRM 2011, having the layer of indirection of DI/IOC is a good idea and will make your design a bit flexible.