CODEWITHSUNDEEP
c#wpfmvvmdata-binding
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Reputation: 29

Proper way to binding command

I'm trying to bind my own command to a button but nothing I try is working.

I got the window's DataContext bound via XAML but when I try to bind to my command IntelliSense is not seeing it, and the command is not executed. I tried to bind via code-behind but also met with the same result.

The window's Binding looks like this.

DataContext="{Binding Source={StaticResource mainViewModelLocator}, Path=Commands}"

mainViewModelLocator passes a new instance of the Commands class.

The Commands class :

public ICommand GradeCommand { get; set; }

public Commands()
{
    LoadCommands();
}

private void LoadCommands()
{
    GradeCommand = new CustomCommand(GradeClick, CanGradeClick);
}

private void GradeClick(object obj)
{
    MessageBox.Show("Test");
}

private bool CanGradeClick(object obj)
{
    return true;
}

and ICommand:

private Action<object> execute;
        private Predicate<object> canExecute;

        public CustomCommand(Action<object> execute, Predicate<object> canExecute)
        {
            this.execute = execute;
            this.canExecute = canExecute;
        }

        public bool CanExecute(object parameter)
        {
            bool b = canExecute == null ? true : canExecute(parameter);
            return b;
        }

        public event EventHandler CanExecuteChanged
        {
            add
            {
                CommandManager.RequerySuggested += value;
            }
            remove
            {
                CommandManager.RequerySuggested -= value;
            }
        }

        public void Execute(object parameter)
        {
            execute(parameter);
        }

Upvotes: 1

Views: 79

Answers (1)

fbar
fbar

Reputation: 29

I figured it out. My DataContext binding wasn't working. IChanged it to:

xmlns:vm="clr-namespace:ProgramName.ViewModel"
    <Window.DataContext>
        <vm:Commands/>
    </Window.DataContext>

Upvotes: 1

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