網格模板的 WPF 多重綁定可見性

Question

我有一個列表視圖，其中每個列表視圖都包含幾列數據。 此列表視圖包含 2 個網格，其中 1 個網格是標題。 和顯示所有相關數據的第二個網格。我試圖執行的每個項目是隱藏一些數據，每個屬性數據中某些字段的值。

我怎樣才能做到這一點？ 我嘗試了 multiyBinding，但出現錯誤：

“無法在“綁定”類型的“路徑”屬性上設置“綁定”。只能在 DependencyObject 的 DependencyProperty 上設置“綁定”。”

很高興有代碼示例

這是我寫的代碼

<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

您應該按照以下兩個步驟更改代碼：

1. 將Binding標記擴展更改為Binding對象。
2. 將IMultiValueConverter添加到您的 `MultiBinding.

因此，您可以像這樣更改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只能用於依賴屬性。 但是當您在MultiBinding使用Binding時，您將其視為Binding對象而不是MarkupExtension 。 因此您應該像設置普通 XAML 對象一樣設置Binding屬性。

其次， MultiBinding需要IMultiValueConverter或StringFormat屬性集。

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();
}

---

您可以通過閱讀以下內容了解有關MarkupExtension 、 MultiBinding 、 IMultiValueConverter的更多信息：

• 標記擴展和 WPF XAML | 微軟文檔
• 數據綁定概述 | 微軟文檔
• 多綁定類 (System.Windows.Data) | 微軟文檔
• IMul​​tiValueConverter 接口 (System.Windows.Data) | 微軟文檔