how to use MVVMLight SimpleIoc? [closed]

Question

I'm revamping my software which has messy Messenger.Default(...) bits.

Is there any cheat sheet to know MVVMLight SimpleIoc usage (not general IoC description)?

Answer 1

SimpleIoc crib sheet:

1) You register all your interfaces and objects in the ViewModelLocator

class ViewModelLocator  {      static ViewModelLocator()      {                  ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);                   if (ViewModelBase.IsInDesignModeStatic)          {                           SimpleIoc.Default.Register<IDataService, Design.DesignDataService>();                   }                   else                  {                           SimpleIoc.Default.Register<IDataService, DataService>();                   }                   SimpleIoc.Default.Register<MainViewModel>();                           SimpleIoc.Default.Register<SecondViewModel>();      }             public MainViewModel Main      {           get           {                   return ServiceLocator.Current.GetInstance<MainViewModel>();           }      } }  

2) Every object is a singleton by default. To resolve an object so that it's not a singleton you need to pass a unique value to the GetInstance call:

SimpleIoc.Default.GetInstance<MainViewModel>(Guid.NewGuid().ToString()); 

3) To register a class against an interface:

SimpleIoc.Default.Register<IDataService, Design.DesignDataService>();   

4) To register a concrete object against an interface:

SimpleIoc.Default.Register<IDataService>(myObject);      

5) To register a concrete type:

SimpleIoc.Default.Register<MainViewModel>();    

6) To resolve an object from an interface:

SimpleIoc.Default.GetInstance<IDataService>(); 

7) To resolve an object directly (does buildup and dependency resolution):

SimpleIoc.Default.GetInstance<MainViewModel>(); 

8) MVVM makes doing design-time data really easy:

if (ViewModelBase.IsInDesignModeStatic)  {                   SimpleIoc.Default.Register<IDataService, Design.DesignDataService>();           }           else          {                   SimpleIoc.Default.Register<IDataService, DataService>();           }   

If you're in design-time mode it will automatically register your design-time services, making it really easy to have data in your viewmodels and views when working in the VS designer.

Hope this helps.