WPF功能区:DataTemplate导致BindingExpression路径错误

Question

我使用WPF RibbonControl(2010年10月版)遇到了一个小问题.我的想法是将RibbonGroup的ItemsSource属性绑定到我的viewmodel,并使用DataTemplate根据需要创建RibbonButtons.这有效,但是当您显示窗口时,它会导致绑定错误(每个按钮一个):

System.Windows.Data Error: 40 : BindingExpression path error: 'IsDropDownOpen' property not found on 'object' ''RibbonContentPresenter' (Name='PART_ContentPresenter')'. BindingExpression:Path=IsDropDownOpen; DataItem='RibbonContentPresenter' (Name='PART_ContentPresenter'); target element is 'RibbonButton' (Name=''); target property is 'NoTarget' (type 'Object')

这是一个代码片段,viewmodel被一个字符串数组所取代,但问题是相同的:

<ribbon:RibbonWindow x:Class="WpfRibbonApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:ribbon="clr-namespace:Microsoft.Windows.Controls.Ribbon;assembly=RibbonControlsLibrary"
        xmlns:sys="clr-namespace:System;assembly=mscorlib"
        Title="MainWindow" x:Name="RibbonWindow" Width="640" Height="480" >

    <ribbon:RibbonWindow.Resources>
        <x:Array x:Key="buttonArray" Type="sys:String">
            <sys:String>Button 1</sys:String>
            <sys:String>Button 2</sys:String>
            <sys:String>Button 3</sys:String>
            <sys:String>Button 4</sys:String>
            <sys:String>Button 5</sys:String>
            <sys:String>Button 6</sys:String>
        </x:Array>
        <DataTemplate x:Key="buttonTemplate">
            <ribbon:RibbonButton Label="{Binding}"  />
        </DataTemplate>        
    </ribbon:RibbonWindow.Resources>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <ribbon:Ribbon>
            <ribbon:RibbonTab Header="Tab1">
                <ribbon:RibbonGroup Header="Group1"
                    ItemsSource="{StaticResource buttonArray}" 
                    ItemTemplate="{StaticResource buttonTemplate}"
                />
            </ribbon:RibbonTab>
        </ribbon:Ribbon>         
    </Grid>
</ribbon:RibbonWindow>

再次,它的工作原理,但绑定错误有点烦人.有没有办法摆脱它？

Answer 1

绑定错误位于 RibbonControlsLibrary 内 RibbonButton 的控件模板中。该样式定义了以下 MultiDataTrigger，并在 RibbonButton 用作另一个控件（如 RibbonSplitButton）的一部分时使用。

<MultiDataTrigger>
    <MultiDataTrigger.Conditions>
        <Condition Binding="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsDropDownOpen}" Value="True" />
        <Condition Binding="{Binding RelativeSource={RelativeSource Self}, Path=IsEnabled}" Value="False" />
        <Condition Binding="{Binding Path=HighContrast, Source={x:Static shell:SystemParameters2.Current}}" Value="True" />
    </MultiDataTrigger.Conditions>
    <Setter TargetName="OuterBorder" Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.ControlLightBrushKey}}" />
</MultiDataTrigger>