private static ObservableCollection <SelectableViewModel> CreateData_Date()
        {
            ObservableCollection <SelectableViewModel> rtn = new ObservableCollection <SelectableViewModel>();

            char[] suji = { '①', '②', '③', '④', '⑤', '⑥', '⑦', '⑧', '⑨', '⑩', '⑪', '⑫', '⑬', '⑭', '⑮', '⑯', '⑰', '⑱', '⑲', '⑳', '㉑', '㉒', '㉓', '㉔', '㉕', '㉖', '㉗', '㉘', '㉙', '㉚', '㉛' };
            for (int i = 0; i < 31; i++)
            {
                SelectableViewModel v = new SelectableViewModel();
                v.Code        = suji[i];
                v.Name        = "chk" + (i + 1).ToString();
                v.Description = (i + 1).ToString() + "日";
                rtn.Add(v);
            }
            return(rtn);
        }
        private static ObservableCollection <SelectableViewModel> CreateData_Day()
        {
            ObservableCollection <SelectableViewModel> rtn = new ObservableCollection <SelectableViewModel>();
            // 初期曜日取得:日曜日
            DateTime theDay = new DateTime(2021, 5, 9);

            for (int i = 0; i < 7; i++)
            {
                DateTime            getDay = theDay.AddDays(i);
                SelectableViewModel v      = new SelectableViewModel();
                v.Code        = char.Parse(getDay.ToString("ddd", System.Globalization.CultureInfo.GetCultureInfo("ja-JP")));
                v.Name        = "chk" + (i + 1).ToString();
                v.Description = getDay.ToString("dddd", System.Globalization.CultureInfo.GetCultureInfo("ja-JP"));
                rtn.Add(v);
            }
            return(rtn);
        }