a·gen·tic a·gil·i·ty

MVVM for Dummies

Explains the MVVM pattern in WPF and Silverlight, highlighting separation of concerns, code structure, and the roles of commanding, dependency injection, and design patterns.

Published on
2 minute read
Image
https://nkdagility.com/resources/__7oXNKjdWP
Subscribe

I think that I have found one of the best articles on MVVM that I have ever read:

http://jmorrill.hjtcentral.com/Home/tabid/428/EntryId/432/MVVM-for-Tarded-Folks-Like-Me-or-MVVM-and-What-it-Means-to-Me.aspx

This article sums up what is in MVVM and what is outside of MVVM. Note, when I and most other people say MVVM, they really mean MVVM, Commanding, Dependency Injection + any other Patterns you need to create your application.

In WPF a lot of use is made of the Decorator and Behaviour pattern as well. The goal of all of this is to have pure separation of concerns. This is what every code behind file of every Control / Window / Page  should look like if you are engineering your WPF and Silverlight correctly:

C# – Ideal

1  public partial class IdealView : UserControl
2  {
3      public IdealView()
4      {
5          InitializeComponent();
6      }
7  }

Figure: This is the ideal code behind for a Control / Window / Page when using MVVM.

C# – Compromise, but works

1  public partial class IdealView : UserControl
2  {
3      public IdealView()
4      {
5          InitializeComponent();
6
7          this.DataContext = new IdealViewModel();
8      }
9  }

Figure: This is a compromise, but the best you can do without Dependency Injection

VB.NET – Ideal

1Partial Public Class ServerExplorerConnectView
2
3End Class

Figure: This is the ideal code behind for a Control / Window / Page when using MVVM.

VB.NET – Compromise, but works

1Partial Public Class ServerExplorerConnectView
2
3    Private Sub ServerExplorerConnectView_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded
4        Me.DataContext = New ServerExplorerConnectViewModel
5    End Sub
6
7End Class

Figure: This is a compromise, but the best you can do without Dependency Injection

Technorati Tags: .NET   WPF   Silverlight   MVVM

Software Development
Subscribe

Related Blog

No related videos found.

Connect with Martin Hinshelwood

If you've made it this far, it's worth connecting with our principal consultant and coach, Martin Hinshelwood, for a 30-minute 'ask me anything' call.

Our Happy Clients​

We partner with businesses across diverse industries, including finance, insurance, healthcare, pharmaceuticals, technology, engineering, transportation, hospitality, entertainment, legal, government, and military sectors.​

Boeing Logo

Boeing

Illumina Logo

Illumina

Qualco Logo

Qualco

Philips Logo

Philips

Milliman Logo

Milliman

NIT A/S

Healthgrades Logo

Healthgrades

SuperControl Logo

SuperControl

Lean SA Logo

Lean SA

Slicedbread Logo

Slicedbread

YearUp.org Logo

YearUp.org

Graham & Brown Logo

Graham & Brown

Capita Secure Information Solutions Ltd Logo

Capita Secure Information Solutions Ltd

Xceptor - Process and Data Automation Logo

Xceptor - Process and Data Automation

ALS Life Sciences Logo

ALS Life Sciences

Boxit Document Solutions Logo

Boxit Document Solutions

Lockheed Martin Logo

Lockheed Martin

Big Data for Humans Logo

Big Data for Humans

Ghana Police Service Logo

Ghana Police Service

Department of Work and Pensions (UK) Logo

Department of Work and Pensions (UK)

Royal Air Force Logo

Royal Air Force

New Hampshire Supreme Court Logo

New Hampshire Supreme Court

Nottingham County Council Logo

Nottingham County Council

Washington Department of Enterprise Services Logo

Washington Department of Enterprise Services

MacDonald Humfrey (Automation) Ltd. Logo

MacDonald Humfrey (Automation) Ltd.

Microsoft Logo

Microsoft

Jack Links Logo

Jack Links

Lean SA Logo

Lean SA

NIT A/S

Graham & Brown Logo

Graham & Brown