Projects to learn WPF and MVVM

Navigation on single window with navigation bar to switch between mutltiple views

Based on https://www.youtube.com/watch?v=wFzmBZpjuAo

Reimplementation of NavigationTest using MVVM Community Toolkit

Sharing live data between two views using singleton service

Based on https://www.youtube.com/watch?v=umRSp4qB6Tw

Reimplementation of SharingData using MVVM Community Toolkit

Switching between light and dark themes

Based on https://www.youtube.com/watch?v=Zr-pLUt9yEw

Use messager pub-sub mechanism to send messages between viewmodels

Based on https://learn.microsoft.com/en-us/dotnet/communitytoolkit/mvvm/messenger

Close window/view from viewmodel

Based on https://stackoverflow.com/questions/16172462/close-window-from-viewmodel

Use wpf LearnWpf.PasswordBox correctly with mvvm pattern

Based on https://stackoverflow.com/questions/1483892/how-to-bind-to-a-LearnWpf.PasswordBox-in-mvvm

Wpf MVVM customer CRUD with EFCore

Based on https://www.pluralsight.com/courses/wpf-mvvm-in-depth

Async load of data into viewmodel

Based on CommunityToolkit/MVVM-Samples#25

Basic principles

• Model stores data and provides functions to manipulate the data
• Model does NOT reference ViewModel
• Model does NOT reference View
• ViewModel does NOT reference View
• ViewModel exposes data to View via properties
• ViewModel exposes change events to View via INotifyPropertyChanged interface
• ViewModel provides functionality to View via commands
• ViewModel does NOT directly manipulate data
• ViewModel references Model
• ViewModel manipulates data either through functions in Model or additional layer
• View references ViewModel
• View does NOT implement business logic
• View may implement logic ONLY when its purely for UI behavior
• View binds to properties in view model
• View calls commands exposed in ViewModel
• View is notified of updates in ViewModel via INotifyPropertyChanged event

Responsibilities for Model, ViewModel and View

Model

• Contains client data
• Contains model object relationships
• Contains computed properties
• Raise change events - implements INotifyPropertyChanged
• Performs validation - implements IDataErrorInfo
• Raise validation error events - implements INotifyDataError

ViewModel

• Exposes data to view for reading and writing
• Handles interaction logic ** Calls to domain layer, data layer, services ** Navigation ** Logic for managing client state

View

• Structure and layout of UI
• Rules for Code behind ** Ideally no code behind (as little as possible) ** Any code that REQUIRES explicit references to UI elements can be put in code behind ** Ideally abstract functionality via interfaces -> see CloseableTest ** Handle controls that do not support MVVM pattern

• View is constructed first
• ViewModel is constructed and set as DataContext on the View

• ViewModel is constructed first
• View is constructed based on ViewModel in UI (DataTemplate)

Projects are based on several text and video tutorials

• https://www.youtube.com/@_buffer/videos
• https://www.youtube.com/playlist?list=PLrW43fNmjaQVYF4zgsD0oL9Iv6u23PI6M
• https://learn.microsoft.com/en-us/previous-versions/msp-n-p/hh848246(v=pandp.10)?redirectedfrom=MSDN
• https://learn.microsoft.com/en-us/dotnet/communitytoolkit/mvvm/puttingthingstogether
• https://learn.microsoft.com/en-us/ef/core/get-started/wpf
• https://github.com/mysteryx93/Modern.Net-Tutorial/
• https://github.com/mysteryx93/HanumanInstitute.MvvmDialogs
• https://github.com/Carlos487/awesome-wpf
• https://github.com/OpenSilver/SampleCRM
• https://www.wpftutorial.net/Home.html
• https://www.pluralsight.com/courses/wpf-mvvm-in-depth
• https://web.archive.org/web/20090413205731/http://karlshifflett.wordpress.com/2008/11/08/learning-wpf-m-v-vm/