WPF中根据IsSelected确定ListBoxItem背景色的问题

[smartstar2005]

我想在选择一个Item的时候设定背景色为Yellow，取消选择的时候设定为Green。下面是代码：

    <Window.Resources>
        <Converters:ItemBackgroundConverter x:Key="ItemBackgroundConverter"/>
        
        <!--ListBoxItem style -->
        <Style TargetType="ListBoxItem">
            <Setter Property="SnapsToDevicePixels" Value="true"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="ListBoxItem">
                        <Border Name="ItemGrid">
                            <ContentPresenter/>
                            <Border.Style>
                                <Style>
                                    <Setter Property="Border.Background" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsSelected, Converter={StaticResource ItemBackgroundConverter}}" />
                                    <Setter Property="Border.BorderBrush" Value="Black" />
                                    <Setter Property="Border.BorderThickness" Value="0.5" />
                                    <Setter Property="Border.CornerRadius" Value="4" />
                                    <Setter Property="Border.Margin" Value="2" />
                                    <Setter Property="Border.Padding" Value="4" />
                                </Style>
                            </Border.Style>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
    <Grid>
        <StackPanel>
            <ListBox>
                <ListBoxItem>Item1</ListBoxItem>
                <ListBoxItem>Item2</ListBoxItem>
                <ListBoxItem>Item3</ListBoxItem>
                <ListBoxItem>Item4</ListBoxItem>
                <ListBoxItem>Item5</ListBoxItem>
                <ListBoxItem>Item6</ListBoxItem>
                <ListBoxItem>Item7</ListBoxItem>
            </ListBox>
        </StackPanel>
    </Grid>

Converter的代码：

    public class ItemBackgroundConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {            
            if (value is Boolean)
            {
                Boolean blnChecked = (Boolean)value;
                if (blnChecked)
                {
                    return Color.FromArgb(0,255,0);
                }
                else
                {
                    return Color.Green;
                }
            }

            return Color.Green;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotSupportedException();
        }
    }

为什么最终的颜色没有改变呢？请大家帮忙看看

[jv9]

Public Class MyConverter 
Implements IValueConverter
Public Function Convert(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As CultureInfo) As Object Implements IValueConverter.Convert 

Dim d As Data = CType(value, Data) 
If d.Name.StartsWith("a") Then
Return New SolidColorBrush(Colors.Green) 
Else
Return New SolidColorBrush(Colors.Yellow) 
End If
End Function
Public Function ConvertBack(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As CultureInfo) As Object Implements IValueConverter.ConvertBack 
Return Nothing
End Function 
End Class

http://silverlightchina.net/html/developer/2009/0924/192.html

[smartstar2005]

OK

多谢了！