To solve that problem there is the Relay Commandimplementation that is a command that can be instantiated passing the actions to be executed as in the following: With this implementation I can specify what I want to execute when I create the command, so I don't need to implement a new class for each different action I want to take.Then it could be called using the following: The Command Manager.Model: This can be really simple, the goal here is for the View Model not to have to do any of the business logic.View Model: This should essentially delegate everything to the Model except for exposing data for the View.View: This should just bind to the View Model and make stuff look pretty.The example application should have the following features: for posterity. The first thing that we are going to do is to create a minimal MVVM framework for us to use in the rest of the application. This interface allows update messages to be passed to the View.MVVM provides a clean separation of concerns between the data model and the view.This is accomplished through the View Model class which is responsible for publishing methods that return collections of our data model to the view so that the view can bind to it and display it. What if, for example, we want to not only bind data in our view, but also bind the Click event of a button to a method defined on our data model? It is easier to show you what I mean than to explain it in theory without a concrete example in front of you.
I like to see what is happening, and why some elements are enabled/disabled.
If it returns false the button will be disabled on the interface. With a simple implementation of ICommand I can create the following: However this does not allow me to have a different logic to my Can Execute or Execute.
For each command I would need to implement a new class.
I’ll immediate add a Car class:public class Car Note: Ideally we would store Checked In Date Time as a Date Time, not a string.
I did this because I want to format the string nicely.
This is good for you because you can now develop PCLs that reference MVVM Light and use its components. In practice, these are elements deriving from Button Base, i.e. This property can be databound to a property of type ICommand.