Click here to Skip to main content
12,406,971 members (63,468 online)
Click here to Skip to main content

Stats

42.9K views
793 downloads
74 bookmarked
Posted

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.Linq;
using System.Text;
using System.ComponentModel;
using PresentationModelBase;
using System.Reflection;

namespace App.Configuration.Wpf
{
    //this property will tell if the PresentationModel is doing
    //some work in background
    class IsWorkingPropertyDescriptor : PropertyDescriptor
    {
        public IsWorkingPropertyDescriptor() :
            base(
             TypeDescriptor.CreateProperty
             (typeof(PresentationModel), "IsWorking", typeof(bool), null))
        {
            _propertyChangeNotification = typeof(PresentationModel).GetMethod("OnPropertyChanged", BindingFlags.NonPublic | BindingFlags.Instance);
        }

        MethodInfo _propertyChangeNotification;
        static Dictionary<PresentationModel, bool> _propertyValues = new Dictionary<PresentationModel, bool>();

        public override bool CanResetValue(object component)
        {
            return true;
        }

        public override Type ComponentType
        {
            get { return typeof(PresentationModel); }
        }

        public override object GetValue(object component)
        {
            PresentationModel pm = (PresentationModel)component;
            if (!_propertyValues.ContainsKey(pm))
            {
                _propertyValues.Add(pm, false);
            }
            return _propertyValues[pm];
        }

        public override bool IsReadOnly
        {
            get { return false; }
        }

        public override Type PropertyType
        {
            get { return typeof(bool); }
        }

        public override void ResetValue(object component)
        {
            SetValue(component, false);
        }

        public override void SetValue(object component, object value)
        {
            PresentationModel pm = (PresentationModel)component;
            if (!_propertyValues.ContainsKey(pm))
            {
                _propertyValues.Add(pm, (bool)value);
            }
            else
                _propertyValues[pm] = (bool)value;
            _propertyChangeNotification.Invoke(component, new object[] { "IsWorking" });
        }

        public override bool ShouldSerializeValue(object component)
        {
            return false;
        }
    }
}

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

Software developer specialized in the .NET framework

You may also be interested in...

| Advertise | Privacy | Terms of Use | Mobile
Web02 | 2.8.160730.1 | Last Updated 11 May 2010
Article Copyright 2010 by Thiago de Arruda
Everything else Copyright © CodeProject, 1999-2016
Layout: fixed | fluid