wpf 绑定ObservableCollection 的Count属性

相信大家都遇到过这样的需求，DataGrid里显示符合筛选条件的学生列表，上方TextBolck里显示学生总数，大家可以这样做：

1，XAML代码

 <Window x:Class="ObservableCollectionDemo.MainWindow"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:ObservableCollectionDemo="clr-namespace:ObservableCollectionDemo"
         Title="MainWindow"
         Height=""
         Width="">
     <Window.DataContext>
         <ObservableCollectionDemo:MainWindowViewModel />
     </Window.DataContext>
     <Grid>
         <Grid.RowDefinitions>
             <RowDefinition Height="Auto" />
             <RowDefinition />
         </Grid.RowDefinitions>
         <TextBlock>学生总数：<Run Text="{Binding Students.Count, Mode=OneWay}" /></TextBlock>
         <DataGrid Grid.Row=""
                   ItemsSource="{Binding Students}" />
     </Grid>
 </Window>

2，.CS代码

 public partial class MainWindow : Window
     {
         public MainWindow()
         {
             InitializeComponent();
         }
     }

     public class Student
     {
         public string Name { get; set; }
         public int Age { get; set; }
     }

     public class MainWindowViewModel
     {
         public ObservableCollection<Student> Students { get; set; }

         public MainWindowViewModel()
         {
             this.Students = new ObservableCollection<Student>();
             for (int i = ; i < ; i++)
             {
                 this.Students.Add(new Student()
                 {
                     Name = string.Format("学生{0}", i),
                     Age =  + i
                 });
             }
         }
     }

3，运行效果