Wpf command canexecute not updating

Rated 3.95/5 based on 719 customer reviews

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?I have a toolbar with a button that executes a command.A button can subscribe to the Can Execute Changed event and be disabled if Can Execute returns .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.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.The key combination CTRL X invokes the Cut command in text classes, image classes, and Web browsers, but the actual logic for performing the Cut operation is defined by the application that performs the cut.

Command sources care about this because they generally need to update their status accordingly (eg. View Model Create a folder named View Model and a class named Person View Model.

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.

Now if I set the boolean property to true in the code, my button never re enables..

I am using Galasofts MVVM light which I believe is a popular MVVM toolkit.

Leave a Reply