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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
1 //在初始化时注册事件2 MC.AddHandler(Button.MouseLeftButtonDownEvent, new RoutedEventHandler(MC_MouseLeftButtonUp), true);3 4 private void MC_MouseLeftButtonUp(object sender, RoutedEventArgs e)事件的关键代码：
1 if (sender is Calendar) 2 { 3 if (MC.InputHitTest(Mouse.GetPosition(e.Source as FrameworkElement)) is TextBlock) 4 { 5 TextBlock tb = MC.InputHitTest(Mouse.GetPosition(e.Source as FrameworkElement)) 6 as TextBlock;//本行代码是个关键，使用了WPF内置的碰撞检测 7 if (tb != null) 8 { 9 10 try11 {12 //获取选择的是哪一天13 int.Parse(tb.Text);14 }15 16 catch (Exception ex) //Click The WeekDaysButton17 {18 19 //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。20 int indexofWeek = (tb.Parent as Grid).Children.IndexOf(tb);21 //次方法能获取切换月份按钮后的当前月份22 DateTime SelectedDay = this.MC.DisplayDate;23 }24 }25 }26 }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
1 public class CustemItems 2 { 3 bool isSpecific; 4 5 public bool IsSpecific 6 { 7 get { return isSpecific; } 8 set { isSpecific = value; } 9 }10 11 DateTime d;12 13 public DateTime Dete14 {15 get { return d; }16 set { d = value; }17 }18 string s;19 20 public string StrOfColor21 {22 get { return s; }23 set { s = value; }24 }25 public CustemItems(DateTime d, string str)26 {27 Dete = d;28 StrOfColor = str;29 }30 } 1 public class BlueLetterDayConverter : IValueConverter 2 { 3 public static List<CustemItems> dict = new List<CustemItems>(); 4 5 6 static BlueLetterDayConverter() 7 { 8 9 }10 11 public object Convert(object value, Type targetType,12 object parameter, CultureInfo culture)13 {14 string text = null;15 for (int i = 0; i < dict.Count; i++)16 {17 if (dict[i].Dete == (DateTime)value)18 {19 text = dict[i].StrOfColor;20 }21 }22 23 return text;24 }25 26 public object ConvertBack(object value, Type targetType,27 object parameter, CultureInfo culture)28 {29 return null;30 }31 public void Add(DateTime date, string str)32 {33 dict.Add(new CustemItems(date, str));34 }35 36 public static void Update(List<CustemItems> MIList)37 {38 dict.Clear();39 dict = MIList;40 }41 42 }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; for (int i = 0; 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
1 <Calendar x:Name="MC" HorizontalAlignment="Left" VerticalAlignment="Top" 2 MouseLeftButtonDown="MC_MouseLeftButtonUp" 3 > 4 <Calendar.CalendarDayButtonStyle> 5 <Style TargetType="{x:Type CalendarDayButton}"> 6 <Setter Property="Template"> 7 <Setter.Value> 8 <ControlTemplate TargetType="{x:Type CalendarDayButton}" x:Name="CalendarDayButtonControlTemplate"> 9 <ControlTemplate.Resources>10 <src:RedLetterDayConverter x:Key="convRed" />11 <src:BlueLetterDayConverter x:Key="convBlue" />12 </ControlTemplate.Resources>13 <Grid>14 <Rectangle x:Name="RedLetterDayBackground" IsHitTestVisible="False" Fill="Red"/>15 <Rectangle x:Name="BlueLetterDayConverter" IsHitTestVisible="False" Fill="Blue"/>16 17 <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" 18 VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Margin="5,1,5,1"/>19 </Grid>20 <ControlTemplate.Triggers>21 <DataTrigger Binding="{Binding Converter={StaticResource convRed}}" Value=http://www.mamicode.com/"{x:Null}">22 <Setter TargetName="RedLetterDayBackground" Property="Visibility" Value=http://www.mamicode.com/"Hidden" />23 </DataTrigger>24 <DataTrigger Binding="{Binding Converter={StaticResource convBlue}}" Value=http://www.mamicode.com/"{x:Null}">25 <Setter TargetName="BlueLetterDayConverter" Property="Visibility" Value=http://www.mamicode.com/"Hidden" />26 </DataTrigger>27 </ControlTemplate.Triggers>28 </ControlTemplate>29 </Setter.Value>30 </Setter>31 </Style>32 </Calendar.CalendarDayButtonStyle>33 34 </Calendar>3.3 更新转换模板的List
1 List<CustemItems> ItemListRed = new List<CustemItems>(); 2 List<CustemItems> ItemListBule = new List<CustemItems>(); 3 4 ... 5 6 RedLetterDayConverter.Update(ItemListRed); 7 BlueLetterDayConverter.Update(ItemListBule); 8 if (!StartTimer) 9 {10 dispatcherTimer.Start();11 }
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。
1 void dispatcherTimer_Tick(object sender, EventArgs e)2 {3 StartTimer = true;4 MC.DisplayDate = MC.DisplayDate.AddMonths(1);5 MC.DisplayDate = MC.DisplayDate.AddMonths(-1);6 Thread.Sleep(50);7 dispatcherTimer.Stop();8 StartTimer = false;9 }
完整的例子：
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