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Presentation Model (MVVM) Good Practices

, 11 May 2010 CPOL
Showing some good practices that can be applied to the Presentation Model/MVVM pattern.
App.Configuration
App.Configuration.Wpf
Interceptors
Properties
Wpf
Properties
Wpf
App.Core
Model
PresentationModel
Properties
Services
App.Data
Properties
libs
AttachedCommandBehavior.dll
Castle.Core.dll
Castle.DynamicProxy2.dll
Castle.MicroKernel.dll
Castle.Windsor.dll
PresentationModelBase
Properties
WPFUI
Properties
View
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel.Design;
using System.Collections;
using System.Reflection;
using System.ComponentModel;

namespace PresentationModelBase
{
    //this service provider will try to create an instance of 
    //the requested service by using some pre-registered 
    //implementations or if the serviceType is a concrete implementation
    //it will use activator to create an instance of it
    internal class ServiceCreator : IServiceProvider
    {
        public ServiceCreator()
        {
            _preRegistered = new Dictionary<Type, Type> 
            {
                { typeof(ICustomActionPresentationModel), typeof(CustomActionPresentationModel) },
                { typeof(ICollection<>), typeof(BindingList<>) }         
            };
        }

        Dictionary<Type, Type> _preRegistered = new Dictionary<Type, Type>();

        #region IServiceProvider Members

        public object GetService(Type serviceType)
        {
            if (serviceType.IsClass && !serviceType.IsAbstract)
            {
                return Activator.CreateInstance(serviceType);
            }
            else 
            {
                if (serviceType.IsGenericType)
                {
                    if (!_preRegistered.ContainsKey(serviceType))
                    {
                        Type genericTypeDefInterface = serviceType.GetGenericTypeDefinition();
                        if (_preRegistered.ContainsKey(genericTypeDefInterface))
                        {
                            Type[] typeParameters = serviceType.GetGenericArguments();
                            Type genericTypeDef = _preRegistered[genericTypeDefInterface];
                            Type constructedType = genericTypeDef.MakeGenericType(typeParameters);
                            return Activator.CreateInstance(constructedType);
                        }
                    }
                    else
                    {
                        Type impl = _preRegistered[serviceType];
                        return Activator.CreateInstance(impl);
                    }
                }               
            }
            return null;
        }

        #endregion
    }

}

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