RaiseCanExecuteChanged more convenience - command

Question

I'd like to RaiseCanExecuteChanged when CanExecute condition got changed.
E.g.:
public class ViewModel
{
public viewModel()
{
Command = new RelayCommand(action,condition);
}
private bool condition()
{
return this.Condition1&&this.Condition2&&this.Condition3;
}
public bool Condition1
{
get{...}
set{.... **command.RaiseCanExecuteChanged();}**
}
public bool Condition2
{
get{...}
set{.... command.**RaiseCanExecuteChanged();}**
}
public bool Condition3
{
get{...}
set{.... **command.RaiseCanExecuteChanged();}**
}
}
That works fine.
But I don't like to write so many RaiseCanExecuteChanged, I want to set these changes automatically.
E.g
In RelayCommand, create a new method named RaiseChanged
public void RaiseChanged(XXXXXX XXX, params string[] propertyNames)
{
// for each property in propertyNames,
// RaiseCanExecuteChanged();
}
I put ViewModel vm as the parameters, and use vm.PropertyChanged+=(s,e)=>{}
But I don't think it's a good way to do this.
Does anyone have other ideas?

Answer 1

I develop my solution where I can do like that:
C# View Model:
public bool CanExecuteMethod(object sender)
{
}
public void ButtonExecuteMethod(object sender)
{
}
public event Action EventNotifyCanExecuteChanged;
private Action _DelegateNotifyCanExecuteChanged;
public Action DelegateNotifyCanExecuteChanged
{
get { return _DelegateNotifyCanExecuteChanged; }
set { _DelegateNotifyCanExecuteChanged = value; }
}
public void CanExecuteFlag
{
if (EventNotifyCanExecuteChanged != null) { EventNotifyCanExecuteChanged(); }
if (_DelegateNotifyCanExecuteChanged != null) { _DelegateNotifyCanExecuteChanged();}
}
XAML:
< Button Content="Button Cmd-ExCeCh" HorizontalAlignment="Left" Margin="27,231,0,0"
VerticalAlignment="Top" Width="120"
Command="{mark:BindCommandResource MainWindowViewModel,
ExecuteMethodName=ButtonExecuteMethod,
CanExecuteMethodName=CanExecuteMethod,
EventToInvokeCanExecuteChanged=EventNotifyCanExecuteChanged,
PropertyActionCanExecuteChanged=DelegateNotifyCanExecuteChanged}" />
I put/share this solution in my open source project MVVM-WPF XAML Mark-up Binding Extensions - http://wpfmvvmbindingext.codeplex.com