首先上图，看下样式

静态样式
gif动图

原理

1. 总览：

Calendar本质上是一个6x7的列表，这个列表可以用ItemsControl来实现。其填充的每一个item都是一个自定义样式的Button，Button外面是一个圆形的border。根据Button按钮的IsEnabled状态，设置foreground以达到灰色不点击的效果。

2. ItemsControl内容的生成：

主要是想办法生成第一行第一列的日期，其他的日期只需要DateTime.AddDays(i)即可。代码参考：

private void SetCalendar(int year, int month) { _days.Clear();//请忽略 DateTime datetime = new DateTime(year, month, 1); int week = (int)datetime.DayOfWeek;//获取指定月份的1号是周几 datetime = datetime.AddDays(1 - week); for (int i = 0; i < 42; i++) { _days.Add(datetime.AddDays(i)); } OnPropertyChanged("Days");//请忽略 }

首先，将当前年月传入，获取到当前月份的第一天是周几，然后推算出ItemsControl的第一行第一列的Datetime，最后就是顺次相加即可。

实现

1. 界面的实现

先上代码：

<Grid  Grid.RowSpan="4" Margin="0,54,0,0" Visibility="{Binding IsShowCalendar,Converter={StaticResource BoolToVisibilityCollapseConverter}}" Background="White" Width="350" HorizontalAlignment="Right"> <Grid.RowDefinitions> <RowDefinition Height="50"></RowDefinition> <RowDefinition Height="auto"></RowDefinition> <RowDefinition Height="auto"></RowDefinition> <RowDefinition Height="*"></RowDefinition> </Grid.RowDefinitions> <StackPanel HorizontalAlignment="Center" Orientation="Horizontal"> <Button VerticalAlignment="Center" Command="{Binding YearCommand}" CommandParameter="Pre" Style="{StaticResource TransparentButtonStyle}"> <Button.Content> <TextBlock Text="&lt;" FontSize="20"></TextBlock> </Button.Content> </Button> <TextBlock VerticalAlignment="Center" FontSize="15" Text="{Binding CurrentYear}"></TextBlock> <Button VerticalAlignment="Center" Command="{Binding YearCommand}" CommandParameter="Next" Style="{StaticResource TransparentButtonStyle}"> <Button.Content> <TextBlock Text="&gt;" FontSize="20"></TextBlock> </Button.Content> </Button> <Button Margin="50,10,10,10" VerticalAlignment="Center" Command="{Binding MonthCommand}" CommandParameter="Pre" Style="{StaticResource TransparentButtonStyle}"> <Button.Content> <TextBlock Text="&lt;" FontSize="20"></TextBlock> </Button.Content> </Button> <TextBlock VerticalAlignment="Center" Text="{Binding CurrentMonth}" FontSize="15"></TextBlock> <Button VerticalAlignment="Center" Command="{Binding MonthCommand}" CommandParameter="Next" Style="{StaticResource TransparentButtonStyle}"> <Button.Content> <TextBlock Text="&gt;" FontSize="20"></TextBlock> </Button.Content> </Button> </StackPanel> <UniformGrid Grid.Row="1" Columns="7"> <TextBlock Text="MON" TextAlignment="Center"></TextBlock> <TextBlock Text="TUE" TextAlignment="Center"></TextBlock> <TextBlock Text="WED" TextAlignment="Center"></TextBlock> <TextBlock Text="THU" TextAlignment="Center"></TextBlock> <TextBlock Text="FRI" TextAlignment="Center"></TextBlock> <TextBlock Text="SAT" TextAlignment="Center"></TextBlock> <TextBlock Text="SUN" TextAlignment="Center"></TextBlock> </UniformGrid> <ItemsControl Grid.Row="2" ScrollViewer.HorizontalScrollBarVisibility="Auto" ScrollViewer.VerticalScrollBarVisibility="Auto" ItemsSource="{Binding Days}"> <ItemsControl.ItemTemplate> <DataTemplate> <Button Background="{Binding Converter={StaticResource BACKUP_DateTimeToColorConverter}}" Style="{StaticResource CalendarTransparentButtonStyle}" Content="{Binding Converter={StaticResource BACKUP_DateTimeToDayConverter}}" Command="{Binding DataContext.ChooseDateCommand,RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type Window}}}" CommandParameter="{Binding}" MouseDoubleClick="Button_MouseDoubleClick"> <Button.Foreground> <MultiBinding Converter="{StaticResource BACKUP_DateTimeToForegroundMultiConverter}"> <Binding></Binding> <Binding Path="DataContext.CurrentMonth" RelativeSource="{RelativeSource FindAncestor,AncestorType={x:Type Window}}"></Binding> </MultiBinding> </Button.Foreground> <Button.IsEnabled> <MultiBinding Converter="{StaticResource BACKUP_DateTimeToEnableMultiConverter}"> <Binding></Binding> <Binding Path="DataContext.CutoffDayBegin" RelativeSource="{RelativeSource FindAncestor,AncestorType={x:Type Window}}"></Binding> <Binding Path="DataContext.CutoffDayEnd" RelativeSource="{RelativeSource FindAncestor,AncestorType={x:Type Window}}"></Binding> </MultiBinding> </Button.IsEnabled> </Button> </DataTemplate> </ItemsControl.ItemTemplate> <ItemsControl.ItemsPanel> <ItemsPanelTemplate> <UniformGrid Columns="7"></UniformGrid> </ItemsPanelTemplate> </ItemsControl.ItemsPanel> </ItemsControl> <StackPanel Grid.Row="3" HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="0,0,0,31" Orientation="Horizontal"> <Button Content="Cancel" Style="{StaticResource btnSecondaryStyle}" Grid.Row="2" Command="{Binding HideCalendarCommand}"></Button> <Button Content="{Binding CalendarSetText}" Style="{StaticResource btnPrimaryStyle}" Grid.Row="2" Command="{Binding HideCalendarCommand}"></Button> </StackPanel> </Grid>

其中，大量用到了Binding和MVVM，如果对方面还不是很扎实，可以参考下刘铁锰的视频.
这段代码中，主要部分是ItemsControl的ItemsSource绑定。这里绑定的是Days,其类型是

public ObservableCollection<DateTime> _days = new ObservableCollection<DateTime>();
        public ObservableCollection<DateTime> Days
        {
            get
            {
                return _days; } }

在设置Button的前景色和IsEnabled状态的时候，你也看到了用的是MultiBinding，并定义了两个Converter：
1. DateTimeToForegroundMultiConverter

 class DateTimeToForegroundMultiConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { DateTime dt=new DateTime(); if(values[0] is DateTime) { dt = (DateTime)values[0]; } int currentMonth; Int32.TryParse(values[1].ToString(), out currentMonth); if (dt.Month == currentMonth) { if(dt.ToShortDateString()==DateTime.Now.ToShortDateString()) { return new SolidColorBrush(Colors.White); } else { return new SolidColorBrush(Colors.Black); } } else { return new SolidColorBrush(Colors.Gray); } } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { return null; } }

2. DateTimeToEnableMultiConverter

 class DateTimeToEnableMultiConverter : IMultiValueConverter
    {
        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture) { DateTime currentDay, cutoffDayBegin,cutoffDayEnd; if(values[0] is DateTime&&values[1] is DateTime&&values[2] is DateTime) { currentDay = (DateTime)values[0]; cutoffDayBegin = (DateTime)values[1]; cutoffDayEnd = (DateTime)values[2]; if (DateTime.Compare(currentDay, cutoffDayBegin) >= 0 && DateTime.Compare(currentDay, cutoffDayEnd) <= 0) { return true; } else { return false; } } else { return false; } } public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture) { return null; } }

2. 后台ViewModel的实现

其实后台没有什么代码，有一个SetCalendar方法，在月份或者年份发生变动的时候调用一下即可。

private void SetCalendar(int year, int month) { _days.Clear(); DateTime datetime = new DateTime(year, month, 1); int week = (int)datetime.DayOfWeek; datetime = datetime.AddDays(1 - week); for (int i = 0; i < 42; i++) { _days.Add(datetime.AddDays(i)); } OnPropertyChanged("Days"); }

还有一个就是Button点击之后的Command命令：

 private void exeChooseDate(object obj)
        {
            DateTime dt;
            DateTime.TryParse(obj.ToString(), out dt); CurrentMonth = dt.Month; CurrentYear = dt.Year; }

Button每点击一次，就会执行一次这个方法，CurrentMonth和CurrentYear这两个属性的值就会被更改，一些来决定是否需要重新绘制UI切换的上一个/下一个月份。

CurrentMonth和CurrentYear属性见下：

private int _currentYear = 2010;
        public int CurrentYear { get { return _currentYear; } set { if (_currentYear != value && value > 1978 && value < 9999) { _currentYear = value; OnPropertyChanged("CurrentYear"); SetCalendar(_currentYear, CurrentMonth); } } } private int _currentMonth = 1; public int CurrentMonth { get { return _currentMonth; } set { if (_currentMonth != value && value < 13 && value > 0) { _currentMonth = value; OnPropertyChanged("CurrentMonth"); SetCalendar(CurrentYear, _currentMonth); } } }

【C#】wpf自定义calendar日期选择控件的样式

首先上图，看下样式

原理

1. 总览：

2. ItemsControl内容的生成：

实现

1. 界面的实现

2. 后台ViewModel的实现

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