Wpf command canexecute not updating
Passing a parameter to the Can Execute and Execute methods A parameter can be passed through the "Command Parameter" property. Once the button is clicked, the command parameter is passed to the Execute method.
Once the button is clicked the selected address value is passed to the ICommand. The Command Parameter is sent to both Can Execute and Execute events. Define a class Updater and implement ICommand interface. You can also bind a command to any control that supports the command property.
To continue the example of cutting an object or text, the action only makes sense when something is selected.
If a user tries to cut an object or text without having anything selected, nothing would happen.
But if I have to do this for every button this could get messy. Mayb the default binding on the Is Enabled property only being One Way or something?
The semantics of a command can be consistent across applications and classes, but the logic of the action is specific to the particular object acted upon.
The ICommand interface is defined inside the System. In order to know the Can Execute value, listen to the Can Execute Changed event, that may vary based on the parameter passed.
Use of ICommand The ICommand interface is generally used in the MVVM architecture.
By using commands, you can bind each type of user action to the same logic.
Another purpose of commands is to indicate whether an action is available.