System.Mvvm.SourceGenerators

Source generator library for DSoft.System.Mvvm

Functionality

• MVVMViewModelAttribute
  • Class attribute for converting class to a ViewModel and enabling notificaiton of ICommand CanExecute notifications

MVVMViewModelAttribute

Add the MVVMViewModel attribute to your view model class.

The source generator will detect properties that have types of System.Windows.Input.ICommand or System.Mvvm.DelegateCommand and fields of type System.Mvvm.DelegateCommand and will generate overrides for NotifyCommandsPropertiesChanged and NotifyCommandFieldsCanExecuteChanged to ensure that bindings to the commands are updated.

Example class

[MVVMViewModel]
public partial class SourceGeneratorViewModel
{

	private DelegateCommand _okCommand;
	private ICommand _didCommand;
	private DelegateCommand _cancelCommand;

	public ICommand OkCommand
	{
		get
		{
			return _okCommand ??= new DelegateCommand(() =>
			{
				try
				{

				}
				catch (Exception ex)
				{
					NotifyErrorOccurred(ex);
				}
			});
		}
	}



	public ICommand DoSomethingCommand
	{
		get
		{
			return new DelegateCommand(() =>
			{
				try
				{

				}
				catch (Exception ex)
				{
					NotifyErrorOccurred(ex);
				}
			});
		}
	}



	public ICommand DidSomethingOnce
	{
		get
		{
			return _didCommand ??= new DelegateCommand(() =>
			{
				try
				{

				}
				catch (Exception ex)
				{

					NotifyErrorOccurred(ex);
				}
			});
		}
	}



}

Generated partial

public partial class SourceGeneratorViewModel : System.Mvvm.ViewModel
{
    
    protected override void NotifyCommandsPropertiesChanged()
    {
        SimpleNotififyPropertyChanged("OkCommand");
        SimpleNotififyPropertyChanged("DoSomethingCommand");
        SimpleNotififyPropertyChanged("DidSomethingOnce");
    }

    protected override void NotifyCommandFieldsCanExecuteChanged()
    {
        var dCommands = new List<DelegateCommand>();

        if (_cancelCommand != null)
            dCommands.Add(_cancelCommand);

        if (dCommands.Any())
            DelegateCommand.BulkNotifyRaiseCanExecuteChanged(dCommands);
    }
}