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WPF里ItemsControl的分组实现

  我们在用到ItemsControl时,有时会用到分组,如ListBox,ListView,DataGrid。WPF的ItemsControl可以实现分组,是依托于GroupStyle,以ListBox为例,他的分组效果图为:

  以下为前台:

 1 <ListBox Name="lbMain"> 2     <ListBox.ItemTemplate> 3         <DataTemplate> 4             <StackPanel Orientation="Horizontal"> 5                 <TextBlock Text="{Binding FileName}" 6                            Width="150" /> 7                 <TextBlock Text="{Binding AuthorName}" 8                            Width="100" /> 9                 <TextBlock Text="{Binding UpTime}"10                            Width="100" />11             </StackPanel>12         </DataTemplate>13     </ListBox.ItemTemplate>14     <ListBox.GroupStyle>15         <GroupStyle>16             <GroupStyle.ContainerStyle>17                 <Style TargetType="{x:Type GroupItem}">18                     <Setter Property="Template">19                         <Setter.Value>20                             <ControlTemplate TargetType="{x:Type GroupItem}">21                                 <Expander IsExpanded="True"22                                           ExpandDirection="Down">23                                     <Expander.Header>24                                         <StackPanel Orientation="Horizontal">25                                             <TextBlock Text="{Binding Path=Name}"26                                                        VerticalAlignment="Center" />27                                             <TextBlock Text="{Binding Path=ItemCount, StringFormat=数量:{0}}"28                                                        VerticalAlignment="Center"29                                                        Margin="5,0,0,0" />                                   30                                             <Button Content="Sale"31                                                     Margin="5,0,0,0" />32                                         </StackPanel>33                                     </Expander.Header>34                                     <ItemsPresenter />35                                 </Expander>36                             </ControlTemplate>37                         </Setter.Value>38                     </Setter>39                 </Style>40             </GroupStyle.ContainerStyle>41         </GroupStyle>42     </ListBox.GroupStyle>43 </ListBox>

  从16行可以看出,GroupStyle定义的是控件内部样式,所以有人尝试在这里绑实体数据属性的话肯定是失败的,注意25行只能是Name,不管分组的属性叫什么名,这都只能是Name,我写了个Button在里面,如果想知道为什么只能是Name,写个Click处理,把Button的DataContext打印出来就什么都知道了。如果想在这里做更多的处理,比如进行一些负责的运算,可以写加转换器。

  这里只是弄了一个原始的Expander装载分组控件,需要美化可以另写样式。

  以下是后台:

 1 public class ModelFile 2 { 3     public string FileName { get; set; } 4     public string AuthorName { get; set; } 5     public string UpTime { get; set; } 6 } 7  8 public partial class MainWindow : Window 9 {10     public ObservableCollection<ModelFile> CollectionModelFile = new ObservableCollection<ModelFile>();11 12     public MainWindow()13     {14         InitializeComponent();15 16         CollectionModelFile.Add(new ModelFile() { FileName = "WPF进化史", AuthorName = "王鹏", UpTime = "2014-10-10" });17         CollectionModelFile.Add(new ModelFile() { FileName = "WPF概论", AuthorName = "大飞", UpTime = "2014-10-10" });18         CollectionModelFile.Add(new ModelFile() { FileName = "WPF之美", AuthorName = "小虫", UpTime = "2014-10-11" });19         CollectionModelFile.Add(new ModelFile() { FileName = "WPF之道", AuthorName = "青草", UpTime = "2014-11-11" });20         CollectionModelFile.Add(new ModelFile() { FileName = "WPF之禅", AuthorName = "得瑟鬼", UpTime = "2014-11-11" });21         CollectionModelFile.Add(new ModelFile() { FileName = "WPF入门", AuthorName = "今晚吃什么", UpTime = "2014-11-11" });22         CollectionModelFile.Add(new ModelFile() { FileName = "WPF神技", AuthorName = "无间道王二", UpTime = "2014-12-12" });23         CollectionModelFile.Add(new ModelFile() { FileName = "WPF不为人知之密", AuthorName = "星期八", UpTime = "2014-12-12" });24         CollectionModelFile.Add(new ModelFile() { FileName = "WPF之革命", AuthorName = "两把刀", UpTime = "2014-12-12" });25 26         lbMain.ItemsSource = CollectionModelFile;27 28         ICollectionView cv = CollectionViewSource.GetDefaultView(lbMain.ItemsSource);29         cv.GroupDescriptions.Add(new PropertyGroupDescription("UpTime"));30     }31 }

  重点是28、29行,有了这两句,ListBox就能准确得分组显示了,其他ItemsControl的分组类同。

  至此一个简单的ListBox分组显示就完成了,Demo已放群里,需要的可以下载来看。

WPF里ItemsControl的分组实现