关于WPF中Image的Source属性绑定的问题，求高手指点！

2014-10-05 06:01:09 1.1k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

WPF Image控件Source属性绑定后台实现切换图片【代码】WPF Image控件Source属性绑定后台实现切换图片。阅读详情

本人初学WPF，对其中的数据绑定不能理解，本意想编写一个指示灯程序，当某个值为TRUE是Image加载绿色图片，反之则为红色，但一直搞不定，请高手看看哪出问题了？
Xaml代码：



<Window x:Class="WpfApplication6.MainWindow"

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

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

        xmlns:converters="clr-namespace:WpfApplication6"

        Title="MainWindow" Height="350" Width="525">

    <Window.Resources>

        <converters:BoolToSource x:Key="booltosource"></converters:BoolToSource>

    </Window.Resources>

    <Grid>

        <Grid.ColumnDefinitions>

            <ColumnDefinition Width="1*"/>

            <ColumnDefinition Width="1*"/>

        </Grid.ColumnDefinitions>

        <Grid.RowDefinitions>

            <RowDefinition Height="*"/>

            <RowDefinition Height="75"/>

        </Grid.RowDefinitions>

        <Image x:Name="img" Grid.Row="0" Grid.ColumnSpan="2" Source="{Binding Path=URL, Converter={StaticResource booltosource}}"/>

        <TextBox x:Name="tb" Grid.Column="0" Grid.Row="1"></TextBox>

        <Button x:Name="bt" Content="点击" Grid.Column="1" Grid.Row="1" VerticalAlignment="Center" HorizontalAlignment="Center" Width="100" Height="50" Click="bt_Click"></Button>

    </Grid>

</Window>

数据转换器代码：



using System;

using System.Collections.Generic;

using System.Windows.Data;

using System.Linq;

using System.Text;

using System.Windows.Media.Imaging;



namespace WpfApplication6

{

    [ValueConversion(typeof(bool), typeof(BitmapImage))]

    class BoolToSource:IValueConverter 

    {

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

        {

            bool temp =(bool) value;

            if (temp)

                return  new BitmapImage(new Uri("Images\\red.ico", UriKind.Relative));

            else

                return new BitmapImage(new Uri("Images\\green.ico", UriKind.Relative));

        }





        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)

        {

            throw new NotImplementedException();

        }



    }

}

窗口后台代码：



using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;



namespace WpfApplication6

{

    /// <summary>

    /// MainWindow.xaml 的交互逻辑

    /// </summary>

    public partial class MainWindow : Window

    {

        Binding bd = new Binding();

        bool ss;

        public MainWindow()

        {

            InitializeComponent();

            ss=true ;

            bd.Source = ss;

            bd.Path = new PropertyPath("URL");

            this.img.SetBinding(Image.SourceProperty, bd);

        }



        private void bt_Click(object sender, RoutedEventArgs e)

        {

           

        }

    }

}