在WPF日历上标记特定日期

<Calendar x:Name="MyCalendar" />

public ObservableCollection<DateTime> SpecialDates { get; set; }

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    SpecialDates = new ObservableCollection<DateTime>();
    // 添加特定日期到集合中
    SpecialDates.Add(new DateTime(2022, 1, 1));
    SpecialDates.Add(new DateTime(2022, 2, 14));
    // 将集合与Calendar控件进行数据绑定
    MyCalendar.SetBinding(Calendar.SelectedDatesProperty, new Binding("SpecialDates"));
}

<Calendar x:Name="MyCalendar" CalendarDayButtonStyle="{StaticResource CalendarDayButtonStyle}">
    <Calendar.Resources>
        <Style x:Key="CalendarDayButtonStyle" TargetType="CalendarDayButton">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="CalendarDayButton">
                        <Grid>
                            <Ellipse x:Name="DayButtonEllipse" Fill="{TemplateBinding Background}" />
                            <TextBlock x:Name="DayTextBlock" Text="{TemplateBinding Content}" HorizontalAlignment="Center" VerticalAlignment="Center" />
                        </Grid>
                        <ControlTemplate.Triggers>
                            <DataTrigger Binding="{Binding}" Value="{x:Static Calendar.BlackoutDatesProperty}">
                                <Setter TargetName="DayButtonEllipse" Property="Fill" Value="Red" />
                            </DataTrigger>
                            <DataTrigger Binding="{Binding}" Value="{x:Static Calendar.SelectedDatesProperty}">
                                <Setter TargetName="DayButtonEllipse" Property="Fill" Value="Green" />
                            </DataTrigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Calendar.Resources>
</Calendar>