kosorin

public class ItemClickAction : DependencyObject, IAction
{
    public ICommand Command
    {
        get { return (ICommand)GetValue(CommandProperty); }
        set { SetValue(CommandProperty, value); }
    }
    
    public static readonly DependencyProperty CommandProperty =
        DependencyProperty.Register(nameof(Command), typeof(ICommand), typeof(ItemClickAction), new PropertyMetadata(null));

kosorin

public class DateRange : IEquatable<DateRange>
{
    public DateTime Start { get; }

    public DateTime End { get; }

    public double Days { get; }

    public DateRange(DateTime start, DateTime end)
    {

kosorin

// https://stackoverflow.com/a/3670089/1933104

public static bool ScrambledEquals<T>(this ICollection<T> self, ICollection<T> other)
{
    if (self == null)
    {
        throw new ArgumentNullException(nameof(self));
    }

    if (other == null)