カレンダーを表示するコード

calendar.cs

var firstDate = new DateTime(DateTime.Now.Year, DateTime.Now.Month, 1);
int dayOfWeek= (int)firstDate.DayOfWeek; //日曜=0 … 土曜=6
int lastDay = firstDate.AddMonths(1).AddDays(-1).Day;
for (int day = 1; day <= lastDay; day++)
{
    int index = (day - 1) + dayOfWeek; // 左上のマスを0番として、左から右へ数えていった番号
    int x = index % 7;	// column(横方向)位置
    int y = index / 7;  // row(縦方向)位置

    var color = Windows.UI.Colors.White;
    if (x == 0) // 日曜日
        color = Windows.UI.Colors.Red;
    else if (x == 6) // 土曜日
        color = Windows.UI.Colors.Cyan;
    var fg = new SolidColorBrush(color);

    var tb = new TextBlock()
    {
        Text = string.Format("{0}", day),
        FontSize = 40,
        Foreground = fg,
    };
    var fr = new Frame()
    {
        Content = tb,
        BorderBrush = new SolidColorBrush(Windows.UI.Colors.LightSlateGray),
        BorderThickness = new Thickness(2.0),
        Margin = new Thickness(0.0, 0.0, -2.0, -2.0),
        Padding = new Thickness(5.0, 0.0, 5.0, 0.0),
        Background = new SolidColorBrush(Windows.UI.Color.FromArgb(255, 64, 64, 64)),
        HorizontalAlignment = Windows.UI.Xaml.HorizontalAlignment.Stretch,
        VerticalAlignment = Windows.UI.Xaml.VerticalAlignment.Stretch,
    };
    this.CalendarGrid.Children.Add(fr);
    fr.SetValue(Grid.ColumnProperty, x);
    fr.SetValue(Grid.RowProperty, y);
}