Windows 8 MVVM Patterns Revealed by Ashish Ghoda

Author:Ashish Ghoda
Language: eng
Format: mobi, epub
ISBN: 9781430249085
Publisher: Apress
Published: 0101-01-01T00:00:00+00:00

The first delegate is called when ICommand.Execute(Object param) is invoked.

The second delegate evaluates the state of the command when ICommand.CanExecute(Object param) is called.

You also have to implement a method, in our case named RaiseCanExecuteChanged(), which triggers the CanExecuteChanged event. This causes the UI element to reevaluate the CanExecute() of the command.

The following code snippet demonstrates the above-mentioned implementation of the DelegateCommand class:

public class DelegateCommand : ICommand

{

private readonly Action<object> _execute;

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