/// <summary>
/// Observes a property that is used to determine if this command can execute, and if it implements INotifyPropertyChanged it will automatically call DelegateCommandBase.RaiseCanExecuteChanged on property changed notifications.
/// </summary>
/// <param name="canExecuteExpression">The property expression. Example: ObservesCanExecute((o) => PropertyName).</param>
/// <returns>The current instance of DelegateCommand</returns>
protected internal void ObservesCanExecuteInternal(Expression <Func <object, bool> > canExecuteExpression)
{
m_CanExecuteMethod = canExecuteExpression.Compile();
AddPropertyToObserve(PropertySupport.ExtractPropertyNameFromLambda(canExecuteExpression));
HookInpc(canExecuteExpression.Body as MemberExpression);
}
protected internal void ObservesPropertyInternal <T>(Expression <Func <T> > propertyExpression)
{
AddPropertyToObserve(PropertySupport.ExtractPropertyName(propertyExpression));
HookInpc(propertyExpression.Body as MemberExpression);
}