The Command enables the Button in Xamarin Prism - xamarin

Question

I am working with Xamarin Prism, I'm trying to disable the button, but whenever I add the command it enables. What can this be ?
Code:
<Button
Command="{Binding save}"
IsEnabled="False"/>

Answer 1

From the document of Button.Command Property we can see:
This property is used to associate a command with an instance of a
button. This property is most often set in the MVVM pattern to bind
callbacks back into the ViewModel. IsEnabled is controlled by the
Command if set.
So, if you don't set the command property, it will work correctly.
If you set the command property, the isEnable is controlled by the Command itself.
Here I wrote an example to show you how to control the button's enable property in the command:
In the xaml:
<ContentPage.BindingContext>
<local:CommandDemoViewModel />
</ContentPage.BindingContext>
<StackLayout>
<Button Text="Divide by 2"
VerticalOptions="CenterAndExpand"
HorizontalOptions="Center"
Command="{Binding DivideBy2Command}"
/>
</StackLayout>
And the ViewModel:
class CommandDemoViewModel : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
public Command DivideBy2Command { private set; get; }
public CommandDemoViewModel()
{
DivideBy2Command = new Command(()=> performCommandAction(), ()=>isButtonEnable());
}
private bool isButtonEnable()
{
//Handle the if the button isEnable here
//Reture ture or false with your own logic here to control the button's isEnabled
return false;
}
private void performCommandAction()
{
//Handle the button click logic here
}
}
Use the constructor public Command(Action execute, Func<bool> canExecute);.
You can control the isEnable by the command's CanExecute. Reture ture or false with your own logic in the method isButtonEnable to control the button's isEnabled.