Wpf 自定义面板实现期间ItemsControl中附加属性的值

我实现了自定义面板工具架，该工具架根据附加的属性工具架排列子对象。精确：

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DataTemplate中的TextBlock不是ItemsPanel测量和排列的元素

您必须在items容器（即ItemContainerStyle中的ContentPresenter）上设置attached属性：

<ItemsControl ItemsSource="{Binding Packs}">
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <local:Shelf/>
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
    <ItemsControl.ItemContainerStyle>
        <Style TargetType="ContentPresenter">
            <Setter Property="local:Shelf.Exact" Value="{Binding Number}"/>
        </Style>
    </ItemsControl.ItemContainerStyle>
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Name}"/>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

值得一提的链接：这解释了问题。

<ItemsControl ItemsSource="{Binding Path=Packs}">
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <local:Shelf />
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <TextBlock local:Shelf.Exact="{Binding Path=Number}" Text="{Binding Path=Name}"/>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>

<local:Shelf Grid.Column="1">
    <TextBlock local:Shelf.Exact="223">Test</TextBlock>
    <TextBlock local:Shelf.Exact="332">Test</TextBlock>
    <TextBlock local:Shelf.Exact="443">Test</TextBlock>
</local:Shelf>

<ItemsControl ItemsSource="{Binding Packs}">
    <ItemsControl.ItemsPanel>
        <ItemsPanelTemplate>
            <local:Shelf/>
        </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>
    <ItemsControl.ItemContainerStyle>
        <Style TargetType="ContentPresenter">
            <Setter Property="local:Shelf.Exact" Value="{Binding Number}"/>
        </Style>
    </ItemsControl.ItemContainerStyle>
    <ItemsControl.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Name}"/>
        </DataTemplate>
    </ItemsControl.ItemTemplate>
</ItemsControl>