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WPF-数据转换

Posted on 2011-05-06 23:02  linFen  阅读(1222)  评论(0)  编辑  收藏  举报

有时我们展现的数据，需要进行转换，比如如果一个学生的成绩过了60，我们显示一个Pass的图片。

XAML:

view sourceprint?
01 <Window x:Class="DeepXAML.MainWindow"
02         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
03         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
04         xmlns:local="clr-namespace:DeepXAML"       
05         xmlns:sys="clr-namespace:System;assembly=mscorlib"
06         Title="MainWindow" Height="250" Width="450">
07     <Window.Resources>
08         <local:ScoreToImageConverter x:Key="sti"></local:ScoreToImageConverter>
09     </Window.Resources>
10     <StackPanel>
11         <ListBox x:Name="listBoxStudents" Margin="10">
12             <ListBox.ItemTemplate>
13                 <DataTemplate>
14                     <StackPanel Orientation="Horizontal">
15                         <TextBlock Text="{Binding Path=Name}"></TextBlock>                        
16                         <Image Source="{Binding Path=Score,Converter={StaticResource sti}}" Height="20"></Image>
17                     </StackPanel>
18                 </DataTemplate>
19             </ListBox.ItemTemplate>
20         </ListBox>
21     </StackPanel>
22 </Window>

 

后台代码：

view sourceprint?
01 using System;
02 using System.Collections.Generic;
03 using System.Windows;
04 using System.Windows.Data;
05 using System.Windows.Documents;
06   
07 namespace DeepXAML
08 {
09     public partial class MainWindow : Window
10     {
11         public MainWindow()
12         {
13             InitializeComponent();
14             List<Student> students = new List<Student>{
15              new Student{ Name="Jack", Score=90},
16               new Student{Name="Tom", Score=30},
17               new Student{ Name="David", Score=80}
18             };
19             this.listBoxStudents.ItemsSource = students;
20         }
21   
22     }
23     public class Student
24     {
25         public string Name { get; set; }
26         public double Score { get; set; }
27     }
28     public class ScoreToImageConverter : IValueConverter
29     {
30         public object Convert(object value, Type targetType, object parameter,
31             System.Globalization.CultureInfo culture)
32         {
33             double score = (double)value;
34   
35             return score >= 60 ? @"\images\pass.gif" : @"\images\nopass.gif";
36         }
37   
38         public object ConvertBack(object value, Type targetType, object parameter,
39             System.Globalization.CultureInfo culture)
40         {
41             throw new NotImplementedException();
42         }
43     }
44 }

 

运行结果

image