我有一個綁定到對象的WPF UI。我使用的是ValueConverter由業務規則的屬性轉換爲特定的圖像:刷新使用值轉換器的綁定
public class ProposalStateImageConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var proposal = value as Proposal;
var basePath = "pack://application:,,,/ePub.Content;component/Images/General/Flag_{0}.png";
string imagePath;
if(proposal.Invoice != null)
{
imagePath = string.Format(basePath, "Good");
}
else
{
imagePath = string.Format(basePath, "Warning");
}
var uri = new Uri(imagePath);
var src = uri.GetImageSource(); //Extention method
return src;
}
}
的元素是一個TreeView在圖像上的第二層:
<TreeView x:Name="tree"
ItemsSource="{Binding People}"
SelectedItemChanged="OnTreeItemChanged">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="{x:Type dmn:Person}"
ItemsSource="{Binding Proposals}">
<StackPanel Orientation="Horizontal" ToolTip="{Binding Path=Fullname}" Margin="3">
<Image Margin="5,0,5,0" Width="16" Height="16" Source="pack://application:,,,/ePub.Content;component/Images/General/Person_Active.png" />
<TextBlock Text="{Binding Path=Firstname}" />
<TextBlock Text="{Binding Path=Lastname}" Margin="5,0,0,0" />
</StackPanel>
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="{x:Type dmn:Proposal}">
<StackPanel Orientation="Horizontal" Margin="3">
<Image x:Name="invoiceImage" Width="16" Height="16" Margin="5,0,5,0" Source="{Binding, Converter={StaticResource ProposalStateImageConverter}, UpdateSourceTrigger=PropertyChanged}" />
<TextBlock Text="{Binding DeliveryDate, Converter={StaticResource textCulturedDateConverter}}" />
</StackPanel>
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
據工作很好,但稍後,當對象狀態改變時,我想刷新圖像並重新評估值轉換器。這怎麼可能?
謝謝,這工作像一個魅力。 – 2010-03-18 16:33:12