WPF--Calendar控件高级使用

一、得到当前显示的月份：

DateTime SelectedDay = this.MC.DisplayDate;

二、得到当前选中的天，得到当前选中的周，得到当前显示的月份：

如果你使用系统默认的事件SelectedDateChanged是很难获取焦点的，给Calendar注册MC_MouseLeftButtonUp事件

  //在初始化时注册事件
  MC.AddHandler(Button.MouseLeftButtonDownEvent, new RoutedEventHandler(MC_MouseLeftButtonUp), true);

 private void MC_MouseLeftButtonUp(object sender, RoutedEventArgs e)

事件的关键代码：

 if (sender is Calendar)
 {
     if (MC.InputHitTest(Mouse.GetPosition(e.Source as FrameworkElement)) is TextBlock)
     {
         TextBlock tb = MC.InputHitTest(Mouse.GetPosition(e.Source as FrameworkElement))
  as TextBlock;//本行代码是个关键，使用了WPF内置的碰撞检测
         if (tb != null)
         {

             try
             {
                 //获取选择的是哪一天
                 int.Parse(tb.Text);
             }
 　　　　　　　
 　　　　　　　catch (Exception ex) //Click The WeekDaysButton
 　　　　　　　{

                  //获取选择的是星期几，如果点击“周1、周2、...周7”按钮，程序会走到此处来得出星期几。
 　　　　　　　　　 int indexofWeek = (tb.Parent as Grid).Children.IndexOf(tb);
                  //次方法能获取切换月份按钮后的当前月份
                  DateTime SelectedDay = this.MC.DisplayDate;
 　　　　　　　}
         }
     }
 }

三、自定义日期的背景颜色

3.1、首先要自定义几个类，用于模板转换

   public class CustemItems
     {
         bool isSpecific;

         public bool IsSpecific
         {
             get { return isSpecific; }
             set { isSpecific = value; }
         }

         DateTime d;

         public DateTime Dete
         {
             get { return d; }
             set { d = value; }
         }
         string s;

         public string StrOfColor
         {
             get { return s; }
             set { s = value; }
         }
         public CustemItems(DateTime d, string str)
         {
             Dete = d;
             StrOfColor = str;
         }
     }

 public class BlueLetterDayConverter : IValueConverter
     {
         public static List<CustemItems> dict = new List<CustemItems>();

         static BlueLetterDayConverter()
         {

         }

         public object Convert(object value, Type targetType,
                               object parameter, CultureInfo culture)
         {
             string text = null;
             ; i < dict.Count; i++)
             {
                 if (dict[i].Dete == (DateTime)value)
                 {
                     text = dict[i].StrOfColor;
                 }
             }

             return text;
         }

         public object ConvertBack(object value, Type targetType,
                                   object parameter, CultureInfo culture)
         {
             return null;
         }
         public void Add(DateTime date, string str)
         {
             dict.Add(new CustemItems(date, str));
         }

         public static void Update(List<CustemItems> MIList)
         {
             dict.Clear();
             dict = MIList;
         }

     }

public class RedLetterDayConverter : IValueConverter
    {
        public static List<CustemItems> dict = new List<CustemItems>();

        static RedLetterDayConverter()
        {

        }

        public object Convert(object value, Type targetType,
                              object parameter, CultureInfo culture)
        {
            string text = null;
            ; i < dict.Count; i++)
            {
                if (dict[i].Dete == (DateTime)value)
                {
                    text = dict[i].StrOfColor;
                }
            }

            return text;
        }

        public object ConvertBack(object value, Type targetType,
                                  object parameter, CultureInfo culture)
        {
            return null;
        }
        public void Add(DateTime date, string str)
        {
            dict.Add(new CustemItems(date, str));
        }

        public static void Update(List<CustemItems> MIList)
        {
            dict.Clear();
            dict = MIList;
        }

    }

3.2 Calendar模板的定义

   <Calendar x:Name="MC" HorizontalAlignment="Left" VerticalAlignment="Top"
                   MouseLeftButtonDown="MC_MouseLeftButtonUp"
                  >
             <Calendar.CalendarDayButtonStyle>
                 <Style TargetType="{x:Type CalendarDayButton}">
                     <Setter Property="Template">
                         <Setter.Value>
                             <ControlTemplate TargetType="{x:Type CalendarDayButton}" x:Name="CalendarDayButtonControlTemplate">
                                 <ControlTemplate.Resources>
                                     <src:RedLetterDayConverter x:Key="convRed" />
                                     <src:BlueLetterDayConverter x:Key="convBlue" />
                                 </ControlTemplate.Resources>
                                 <Grid>
                                     <Rectangle x:Name="RedLetterDayBackground" IsHitTestVisible="False" Fill="Red"/>
                                     <Rectangle x:Name="BlueLetterDayConverter" IsHitTestVisible="False" Fill="Blue"/>

                                     <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                                       VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="5,1,5,1"/>
                                 </Grid>
                                 <ControlTemplate.Triggers>
                                     <DataTrigger Binding="{Binding Converter={StaticResource convRed}}"  Value="{x:Null}">
                                         <Setter TargetName="RedLetterDayBackground" Property="Visibility" Value="Hidden" />
                                     </DataTrigger>
                                     <DataTrigger Binding="{Binding Converter={StaticResource convBlue}}"  Value="{x:Null}">
                                         <Setter TargetName="BlueLetterDayConverter" Property="Visibility" Value="Hidden" />
                                     </DataTrigger>
                                 </ControlTemplate.Triggers>
                             </ControlTemplate>
                         </Setter.Value>
                     </Setter>
                 </Style>
             </Calendar.CalendarDayButtonStyle>

         </Calendar>

3.3 更新转换模板的List

 List<CustemItems> ItemListRed = new List<CustemItems>();
 List<CustemItems> ItemListBule = new List<CustemItems>();

 ...

 RedLetterDayConverter.Update(ItemListRed);
 BlueLetterDayConverter.Update(ItemListBule);
 if (!StartTimer)
 {
     dispatcherTimer.Start();
  }

3.4 重点：

　　因为从根本上讲ControlTemplate.Resources是一个静态的资源，它无法做到资源变更后，系统自动会通知控件（或者控件模板）去更新对应的UI显示，这个在《WPF程序设计指南[Charles Petzold]》书中的第535页至539页有详细介绍。所以我们要在变更RedLetterDayConverter 或者BlueLetterDayConverter里面的List<>对象以后，需要使用一个Timer去手动更新UI，从而触发模板的更新。

 void dispatcherTimer_Tick(object sender, EventArgs e)
         {
             StartTimer = true;
             MC.DisplayDate = MC.DisplayDate.AddMonths();
             MC.DisplayDate = MC.DisplayDate.AddMonths(-);
             Thread.Sleep();
             dispatcherTimer.Stop();
             StartTimer = false;
         }

完整的例子：

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