WPF数据转换 - 走看看

WPF数据转换

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:

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<Window x:Class="DeepXAML.MainWindow"

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        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

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        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

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        xmlns:local="clr-namespace:DeepXAML"       

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        xmlns:sys="clr-namespace:System;assembly=mscorlib"

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        Title="MainWindow" Height="250" Width="450"> 

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    <Window.Resources> 

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        <local:ScoreToImageConverter x:Key="sti"></local:ScoreToImageConverter> 

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    </Window.Resources> 

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    <StackPanel> 

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        <ListBox x:Name="listBoxStudents" Margin="10"> 

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            <ListBox.ItemTemplate> 

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                <DataTemplate> 

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                    <StackPanel Orientation="Horizontal"> 

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                        <TextBlock Text="{Binding Path=Name}"></TextBlock>                         

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                        <Image Source="{Binding Path=Score,Converter={StaticResource sti}}" Height="20"></Image> 

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                    </StackPanel> 

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                </DataTemplate> 

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            </ListBox.ItemTemplate> 

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        </ListBox> 

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    </StackPanel> 

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</Window>

后台代码：

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using System; 

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using System.Collections.Generic; 

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using System.Windows; 

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using System.Windows.Data; 

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using System.Windows.Documents; 

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namespace DeepXAML 

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{ 

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    public partial class MainWindow : Window 

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    { 

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        public MainWindow() 

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        { 

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            InitializeComponent(); 

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            List<Student> students = new List<Student>{ 

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             new Student{ Name="Jack", Score=90}, 

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              new Student{Name="Tom", Score=30}, 

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              new Student{ Name="David", Score=80} 

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            }; 

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            this.listBoxStudents.ItemsSource = students; 

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        } 

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    } 

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    public class Student 

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    { 

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        public string Name { get; set; } 

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        public double Score { get; set; } 

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    } 

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    public class ScoreToImageConverter : IValueConverter 

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    { 

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        public object Convert(object value, Type targetType, object parameter, 

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            System.Globalization.CultureInfo culture) 

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        { 

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            double score = (double)value; 

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            return score >= 60 ? @"\images\pass.gif" : @"\images\nopass.gif"; 

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        } 

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        public object ConvertBack(object value, Type targetType, object parameter, 

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            System.Globalization.CultureInfo culture) 

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        { 

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            throw new NotImplementedException(); 

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        } 

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    } 

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}

运行结果