WPF multibinding visibility of a grid template

Question

I have a list view which each listview which contain several columns of data. this list view contain 2 grids, 1 grid which is the header. and a secound grid which show all the relavent data.per the items what I am trying to perform is to hide some of the data per properites the value of some fields in the data.

how can I do that? I tried multiyBinding by I am getting an error:

"'Binding' cannot be set on the 'Path' property of type 'Binding'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject."

would be happy for a code example

here is the code I have written

<ListView x:Name="LVGuiCoreBus" ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.HorizontalScrollBarVisibility="Auto" MouseDown="LVGui_MouseDown"  Grid.Row="1"  VirtualizingPanel.IsContainerVirtualizable="True" VirtualizingPanel.IsVirtualizing="True"  VirtualizingPanel.IsVirtualizingWhenGrouping="True"  SelectionChanged="LVGuiCoreBus_SelectionChanged">                                     
    <ListView.ItemTemplate>
            <DataTemplate>                      
                <VirtualizingStackPanel >
                    <Grid VirtualizingPanel.VirtualizationMode="Recycling">                           
                        <Grid.Visibility>
                            <MultiBinding>
                                <Binding Path="{Binding Source, Converter={StaticResource VisiblieGroupFilterBySourcecs},UpdateSourceTrigger=PropertyChanged}"></Binding>
                                <Binding Path="{Binding Destination, Converter={StaticResource VisiblieGroupFilterBySourcecs},UpdateSourceTrigger=PropertyChanged}"></Binding>
                            </MultiBinding>
                        </Grid.Visibility>

                    <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="130"></ColumnDefinition>
                    <ColumnDefinition Width="10"></ColumnDefinition>
                    <ColumnDefinition Width="50"></ColumnDefinition>
                    <ColumnDefinition Width="10"></ColumnDefinition>
                    <ColumnDefinition Width="50"></ColumnDefinition>
                    <ColumnDefinition Width="10"></ColumnDefinition>
                    <ColumnDefinition Width="100"></ColumnDefinition>
                    <ColumnDefinition Width="10"></ColumnDefinition>                                                      
                    <ColumnDefinition Width="70"></ColumnDefinition>
                    <ColumnDefinition Width="10"></ColumnDefinition>
                    <ColumnDefinition Width="150"></ColumnDefinition>
                    <ColumnDefinition Width="10"></ColumnDefinition>
                    <ColumnDefinition Width="150"></ColumnDefinition>
                    <ColumnDefinition Width="10"></ColumnDefinition>
                    <ColumnDefinition Width="1*"></ColumnDefinition>
                </Grid.ColumnDefinitions>

                <TextBlock Text="{Binding DateNTimeStr}"  Foreground="Green" Grid.Column="0" />
                        <TextBlock Text="{Binding Source}" Foreground="{Binding Source,Converter={StaticResource CoreBusPanelModuleColorConverter},UpdateSourceTrigger=PropertyChanged}" Grid.Column="2" Background="{ Binding Source, Converter={StaticResource BackGroundFilterConverterBySource}}" />
                        <TextBlock Text="{Binding Destination}" Foreground="{Binding Destination,Converter={StaticResource CoreBusPanelModuleColorConverter},UpdateSourceTrigger=PropertyChanged}" Grid.Column="4" Background="{ Binding Destination, Converter={StaticResource BackGroundFilterConvertorByDestantation}}"  />
                        <TextBlock Text="{Binding Module}" Grid.Column="6" HorizontalAlignment="Center" Background="{ Binding Module, Converter={StaticResource BackGroundFilterByModule},UpdateSourceTrigger=PropertyChanged}"   />
                        <TextBlock Text="{Binding Controll}" Grid.Column="8"  Background="{ Binding Controll, Converter={StaticResource BackGRoundFilterByControll},UpdateSourceTrigger=PropertyChanged}" />
                        <TextBlock Text="{Binding Command}" Grid.Column="10" HorizontalAlignment="Center"  Background="{ Binding Command, Converter={StaticResource BackGroundFilterByCommand},UpdateSourceTrigger=PropertyChanged}" />
                        <TextBlock Text="{Binding HSCommand}" Grid.Column="12" HorizontalAlignment="Center"  Background="{ Binding HSCommand, Converter={StaticResource BackGroundFilterByHsCommand},UpdateSourceTrigger=PropertyChanged}" />
                        <TextBlock Text="{Binding Data_Str}"  Grid.Column="14" />                                                                
            </Grid>
                </VirtualizingStackPanel>
            </DataTemplate>
    </ListView.ItemTemplate>
    <ListView.ContextMenu>
        <ContextMenu x:Name="CMMenuCopy">
            <MenuItem x:Name="MCICopyLine" Header="Copy Line" Click="MCICopyLine_Click" ></MenuItem>
            <MenuItem x:Name="MCICopyText" Header="Copy Only Data Array" Click="MCICopyText_Click" ></MenuItem>
            <MenuItem x:Name="MCIClear" Header="Clear" Click="MCIClear_Click"></MenuItem>
        </ContextMenu>
    </ListView.ContextMenu>
</ListView>

Answer 1

You should change your code following these two steps:

1. Change your Binding markup extension to Binding object.
2. Add an IMultiValueConverter to your `MultiBinding.

As a result, you can change your MultiBinding usage like this:

<MultiBinding Converter="{StaticResource YouShouldWriteANewMultiBindingConverterHere}">
    <Binding Path="Source" Converter="{StaticResource VisiblieGroupFilterBySourcecs}" UpdateSourceTrigger="PropertyChanged" />
    <Binding Path="Destination" Converter="{StaticResource VisiblieGroupFilterBySourcecs}" UpdateSourceTrigger="PropertyChanged" />
</MultiBinding>

---

First, the {Binding xxx, Converter=xxx} is used as a MarkupExtension can only be used on a dependency property. But when you use Binding in a MultiBinding , you're treating it as a Binding object instead of a MarkupExtension . so you should set the Binding properties just like a normal XAML object.

Second, a MultiBinding needs an IMultiValueConverter or a StringFormat property set.

public class YouShouldWriteANewMultiBindingConverterHere : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
        => throw new NotImplementedException();

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
        => throw new NotImplementedException();
}

---

You can learn more about MarkupExtension , MultiBinding , IMultiValueConverter by reading these:

• Markup Extensions and WPF XAML | Microsoft Docs
• Data Binding Overview | Microsoft Docs
• MultiBinding Class (System.Windows.Data) | Microsoft Docs
• IMultiValueConverter Interface (System.Windows.Data) | Microsoft Docs