Show dialog with MVVM Light toolkit

Question

I have a ViewModel that needs to show a modal window (using ShowDialog()) on a button click. The ViewModel catches the click command, but I don\'t want to do

Answer 1

You can define an interface and its implementation as follows. And ofcourse with dependency injection container, you have to do someting like this.

NInjectKernel.Bind().To();

Your ViewModel will look something like this.

    private IMessageBoxService _MBService;
    public DropboxSettingsViewModel(IDropboxService dbService, IMessageBoxService mbService)
    {
        if (dbService == null)
            throw new ArgumentNullException("IDropboxService is null");

        _DropboxService = dbService;

        if (mbService == null)
            throw new ArgumentNullException("MessageBoxService is null");

        _MBService = mbService;

    }

Your click command execute method would be as follows.

    private void ConfigureDropboxExecute(object obj)
    {

        _MBService.Show("Error Occured Authenticating dropbox", "Dropbox Authentication", MessageBoxButton.OK, MessageBoxImage.Error, MessageBoxResult.OK);

    }


public interface  IMessageBoxService
{
    MessageBoxResult Show(string messageBoxText);
    MessageBoxResult Show(string messageBoxText, string caption);
    MessageBoxResult Show(Window owner, string messageBoxText);
    MessageBoxResult Show(string messageBoxText, string caption, MessageBoxButton button);
    MessageBoxResult Show(Window owner, string messageBoxText, string caption);
    MessageBoxResult Show(string messageBoxText, string caption, MessageBoxButton button, MessageBoxImage icon);
    MessageBoxResult Show(Window owner, string messageBoxText, string caption, MessageBoxButton button);
    MessageBoxResult Show(string messageBoxText, string caption, MessageBoxButton button, MessageBoxImage icon, MessageBoxResult defaultResult);
    MessageBoxResult Show(Window owner, string messageBoxText, string caption, MessageBoxButton button, MessageBoxImage icon);
    MessageBoxResult Show(string messageBoxText, string caption, MessageBoxButton button, MessageBoxImage icon, MessageBoxResult defaultResult, MessageBoxOptions options);
    MessageBoxResult Show(Window owner, string messageBoxText, string caption, MessageBoxButton button, MessageBoxImage icon, MessageBoxResult defaultResult);
    MessageBoxResult Show(Window owner, string messageBoxText, string caption, MessageBoxButton button, MessageBoxImage icon, MessageBoxResult defaultResult, MessageBoxOptions options);
}

using System.Windows;

public class MessageBoxService : IMessageBoxService
{
    public MessageBoxResult Show(string messageBoxText)
    {
        return MessageBox.Show(messageBoxText);
    }

    public MessageBoxResult Show(Window owner, string messageBoxText)
    {
        return MessageBox.Show(owner, messageBoxText);
    }

    public MessageBoxResult Show(string messageBoxText, string caption)
    {
        return MessageBox.Show(messageBoxText, caption);
    }

    public MessageBoxResult Show(Window owner, string messageBoxText, string caption)
    {
        return MessageBox.Show(owner, messageBoxText, caption);
    }

    public MessageBoxResult Show(string messageBoxText, string caption, MessageBoxButton button)
    {
        return MessageBox.Show(messageBoxText, caption, button);
    }

    public MessageBoxResult Show(Window owner, string messageBoxText, string caption, MessageBoxButton button)
    {
        return MessageBox.Show(owner, messageBoxText, caption, button);
    }

    public MessageBoxResult Show(string messageBoxText, string caption, MessageBoxButton button, MessageBoxImage icon)
    {
        return MessageBox.Show(messageBoxText, caption, button, icon);
    }

    public MessageBoxResult Show(Window owner, string messageBoxText, string caption, MessageBoxButton button, MessageBoxImage icon)
    {
        return MessageBox.Show(owner, messageBoxText, caption, button, icon);
    }

    public MessageBoxResult Show(string messageBoxText, string caption, MessageBoxButton button, MessageBoxImage icon, MessageBoxResult defaultResult)
    {
        return MessageBox.Show(messageBoxText, caption, button, icon, defaultResult);
    }

    public MessageBoxResult Show(Window owner, string messageBoxText, string caption, MessageBoxButton button, MessageBoxImage icon, MessageBoxResult defaultResult)
    {
        return MessageBox.Show(owner, messageBoxText, caption, button, icon, defaultResult);
    }

    public MessageBoxResult Show(string messageBoxText, string caption, MessageBoxButton button, MessageBoxImage icon, MessageBoxResult defaultResult, MessageBoxOptions options)
    {
        return MessageBox.Show(messageBoxText, caption, button, icon, defaultResult, options);
    }

    public MessageBoxResult Show(Window owner, string messageBoxText, string caption, MessageBoxButton button, MessageBoxImage icon, MessageBoxResult defaultResult, MessageBoxOptions options)
    {
        return MessageBox.Show(owner, messageBoxText, caption, button, icon, defaultResult, options);
    }
}