我使用WPF提供的TreeView控件创建文件资源管理器应用程序。我已经对它进行了自定义,使其显示路径旁边的文件图标。我正在使用IValueConverter将路径转换为所需的图像,我基于此页面:http://www.codeproject.com/Articles/21248/A-Simple-WPF-Explorer-Tree绑定转换器不适用于根TreeViewItem元素(WPF)
它主要起作用!除了根TreeViewItems由于某些原因不显示图标。我在IValueConverter :: Convert()函数上放置了一个断点,并确认它不会为根节点执行,而是在所有子节点之后执行。
VS输出窗口显示没有绑定错误,所以我不知道如何发生这种情况。有任何想法吗?
转换代码:
[ValueConversion(typeof(string), typeof(bool))]
public class HeaderToImageConverter : IValueConverter
{
public static HeaderToImageConverter Instance = new HeaderToImageConverter();
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if ((value as string).Contains(@"\"))
{
Uri uri = new Uri("pack://application:,,,/Images/diskdrive.png");
BitmapImage source = new BitmapImage(uri);
return source;
}
else
{
Uri uri = new Uri("pack://application:,,,/Images/folder.png");
BitmapImage source = new BitmapImage(uri);
return source;
}
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotSupportedException("Cannot convert back");
}
}
TreeView控件XAML:
<TreeView Grid.Column="0" Name="fileExplorer" Margin="8,8,8,8">
<TreeView.Resources>
<Style TargetType="{x:Type TreeViewItem}">
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Image Width="20" Height="20" Stretch="Fill" Source="{Binding Converter={x:Static local:HeaderToImageConverter.Instance}}" />
<TextBlock Text="{Binding}" Margin="5,0" VerticalAlignment="Center"/>
</StackPanel>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
</TreeView.Resources>