3rdpartylibs/fastreports.wpf/FastReport.Forms.WPF/CustomControls/Calendar.xaml.cs

using System;
using System.ComponentModel;
using System.Globalization;
using System.Linq;
using System.Windows.Data;

namespace CustomControls
{
    [DesignTimeVisible(false)]
    public partial class Calendar : System.Windows.Controls.Calendar
    {
        public DateTime[] AnnualDates { get; set; }
        public DateTime[] MonthDates { get; set; }
        public DateTime[] Dates { get; set; }

        public Calendar()
        {
            InitializeComponent();
            DataContext = this;
        }
    }

    public class LookupDatesConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            var date = (DateTime)values[0];
            var dates = values[1] as DateTime[];
            return dates?.Where(x => x.Year == date.Year && x.Month == date.Month && x.Day == date.Day).Any();
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) => null;
    }

    public class LookupAnnualDatesConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            var date = (DateTime)values[0];
            var dates = values[1] as DateTime[];
            return dates?.Where(x => x.Month == date.Month && x.Day == date.Day).Any();
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) => null;
    }

    public class LookupMonthDatesConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            var date = (DateTime)values[0];
            var dates = values[1] as DateTime[];
            return dates?.Where(x => x.Day == date.Day).Any();
        }

        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) => null;
    }
}