网格模板的 WPF 多重绑定可见性

Question

我有一个列表视图，其中每个列表视图都包含几列数据。 此列表视图包含 2 个网格，其中 1 个网格是标题。 和显示所有相关数据的第二个网格。我试图执行的每个项目是隐藏一些数据，每个属性数据中某些字段的值。

我怎样才能做到这一点？ 我尝试了 multiyBinding，但出现错误：

“无法在“绑定”类型的“路径”属性上设置“绑定”。只能在 DependencyObject 的 DependencyProperty 上设置“绑定”。”

很高兴有代码示例

这是我写的代码

<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

您应该按照以下两个步骤更改代码：

1. 将Binding标记扩展更改为Binding对象。
2. 将IMultiValueConverter添加到您的 `MultiBinding.

因此，您可以像这样更改MultiBinding用法：

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

---

首先， {Binding xxx, Converter=xxx}用作MarkupExtension只能用于依赖属性。 但是当您在MultiBinding使用Binding时，您将其视为Binding对象而不是MarkupExtension 。 因此您应该像设置普通 XAML 对象一样设置Binding属性。

其次， MultiBinding需要IMultiValueConverter或StringFormat属性集。

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();
}

---

您可以通过阅读以下内容了解有关MarkupExtension 、 MultiBinding 、 IMultiValueConverter的更多信息：

• 标记扩展和 WPF XAML | 微软文档
• 数据绑定概述 | 微软文档
• 多绑定类 (System.Windows.Data) | 微软文档
• IMul​​tiValueConverter 接口 (System.Windows.Data) | 微软文档