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Presentation Model (MVVM) Good Practices

, 11 May 2010
Showing some good practices that can be applied to the Presentation Model/MVVM pattern.
PresentationModelDemo.zip
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
Settings.settings
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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Web03 | 2.8.140916.1 | Last Updated 11 May 2010
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