MVVM

Johan Lindfors

model-view-viewmodel

view

viewmodel

model

separation of concerns

• modularity

• loose coupling

• role separation

• tool friendly

• maintainability

• less code

• testability

separation of concerns

• role separation

• tool friendly

• less code

”everybody wants choices,

no one wants to choose”

• role separation

• tool friendly

• less code

+ ++ + -

++ + + -

+ + ++ -

• role separation

• tool friendly

• less code

• coolness

+ ++ + -

++ + + -

+ + ++ -

- + + ++

• modularity

• loose coupling

• role separation

• tool friendly

• maintainability

• less code

• testability

• coolness

- + + ++

- + + ++

+ ++ + -

++ + + -

++ + - +

+ + ++ -

- + + ++

- + + ++

demo

model

• platform independence?

• PortableClassLibrary?

• [DataContract]

view

• xaml

• popups

• animations

• dispatcher

view-model

• encapsulation or incorporation of model?

• instantiation?

1. per view/page in code

2. per view/page in xaml

3. per application instance

4. using view-model-locator

• converters or conversions?

design time

• mock service or view model?

• what about demo time?

using System.ComponentModel; ... if (DesignerProperties.IsInDesignTool) { }

lesson learned

design code

johan.lindfors@coderox.se

resources

• www.mvvmexplained.com

• caliburnmicro.codeplex.com

• mvvmlight.codeplex.com

• compositewpf.codeplex.com

• programmeramera.se

• www.coderox.se