Question

I have a List of objects and a ListView where I display this list. Such an object has some properties, they are bound to the columns of the ListView.

<ListView x:Name="_fileNameList" FontSize="12" SourceUpdated="_fileNameList_SourceUpdated" TargetUpdated="_fileNameList_TargetUpdated">
    <ListView.View>
        <GridView x:Name="FileNameAttributes" >
            <GridViewColumn  Header="File Name"   Width="200" DisplayMemberBinding="{Binding fileName}"/>
            <GridViewColumn  Header="Size" Width="80" DisplayMemberBinding="{Binding size}"/>
            <GridViewColumn  Header="Date" Width="80" DisplayMemberBinding="{Binding date}"/>
            <GridViewColumn  Header="Time" Width="80" DisplayMemberBinding="{Binding time}"/>
            <GridViewColumn  Header="New Name" Width="300" DisplayMemberBinding="{Binding newFileName}"/>
        </GridView>
    </ListView.View>
</ListView>

This part is working fine.

Now I want to change the Foreground color of the newFileName column in a single row, but only if it is equal to the ‘fileName’ in the same row.

Can I do this in XAML or do I have to go to the code behind file?

I would like it best if I could handle it in XAML, because I think its a pure design issue, but I have no idea, where to start or where to put this, (can I do String comparisons in XAML?)

So I tried to handle this in the code behind file. I thought there must be an event that is raised when the ListView has changed, I tried the SourceUpdated event, but it is not entered when I change the content of my list.
The next problem would be, how to access those ListView items …

Can anyone give me an idea how I can solve this?

Answer 1

You can do this using MultiBinding and MultiConverter.
You will need to write a MultiConverter which takes fileName and newFileName and returns true if they are equal

<ListView x:Name="_fileNameList" FontSize="12" SourceUpdated="_fileNameList_SourceUpdated" TargetUpdated="_fileNameList_TargetUpdated">
            <ListView.View>
                <GridView x:Name="FileNameAttributes" >
                    <GridViewColumn  Header="File Name"   Width="200" DisplayMemberBinding="{Binding fileName}"/>
                    <GridViewColumn  Header="Size" Width="80" DisplayMemberBinding="{Binding size}"/>
                    <GridViewColumn  Header="Date" Width="80" DisplayMemberBinding="{Binding date}"/>
                    <GridViewColumn  Header="Time" Width="80" DisplayMemberBinding="{Binding time}"/>
                    <GridViewColumn  Header="New Name" Width="300">
                        <GridViewColumn.CellTemplate>
                            <DataTemplate>
                                <TextBlock Text="{Binding newFileName}">
                                    <TextBlock.Style>
                                        <Style>
                                            <Setter Property="TextBlock.Foreground" Value="Black"></Setter>
                                            <Style.Triggers>
                                                 <DataTrigger Value="True">
                                                     <DataTrigger.Binding>
                                                         <MultiBinding Converter="{StaticResource EqualityConverter}">
                                                             <Binding Path="newFileName"></Binding>
                                                             <Binding Path="fileName"></Binding>
                                                         </MultiBinding>
                                                     </DataTrigger.Binding>
                                        <Setter Property="TextBlock.Foreground" Value="Red"></Setter>
                                    </DataTrigger>
                                            </Style.Triggers>
                                        </Style>
                                    </TextBlock.Style>
                                </TextBlock>

                            </DataTemplate>
                        </GridViewColumn.CellTemplate>
                    </GridViewColumn>
                </GridView>
            </ListView.View>
        </ListView>

The code for EqualityConverter is as below :

public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        {
            if (values[0].ToString().Equals(values[1].ToString()))
                return true;
            return false;
        }