c# wpf - 不能同时设置 DisplayMemberPath 和 ItemTemplate

问题描述

我想在 listboxItem 中添加工具提示，但是当有 DisplayMemberPath 时它开始出现问题.错误信息说:不能同时设置 DisplayMemberPath 和 ItemTemplate.当我删除 DisplayMemberPath 时，每个列表项中的工具提示都在工作.但我不想删除 DisplayMemember，因为我需要它.如何解决这个问题?

I want to add tooltip in listboxItem but it starts problem when there is DisplayMemberPath. Error message said: cannot set both DisplayMemberPath and ItemTemplate. When I removed DisplayMemberPath, tooltip in each list item is working. But i dont want to remove DisplayMemember because i need it. How to solve this problem?

               <ListBox x:Name="lstToys" Style="{DynamicResource ListBoxStyle1}"  ItemsSource="{Binding Strings}" DisplayMemberPath="Toys" MouseDoubleClick="lstToys_MouseDoubleClick">
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding}" ToolTip="Here is a tooltip"/>
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>

推荐答案

DisplayMemberPath 实际上是单个属性的模板，显示在 TextBlock 中.如果你设置:

DisplayMemberPath is, in effect, a template for a single property, shown in a TextBlock. If you set:

<ListBox x:Name="lstToys" Style="{DynamicResource ListBoxStyle1}"  
         ItemsSource="{Binding Strings}" DisplayMemberPath="Toys">
</ListBox>

相当于:

<ListBox x:Name="lstToys" Style="{DynamicResource ListBoxStyle1}"  
         ItemsSource="{Binding Strings}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Toys}"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

您可以简单地删除 DisplayMemberPath 路径并使用 DataTemplate 的 Binding 中的值:

You can simply remove the DisplayMemberPath path and use the value in your DataTemplate's Binding:

<ListBox x:Name="lstToys" Style="{DynamicResource ListBoxStyle1}"  
         ItemsSource="{Binding Strings}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding Toys}" ToolTip="Here is a tooltip!"/>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

编辑

如果你想设置一个ToolTip但保留DisplayMemberPath，你可以在ItemContainerStyle处进行:

If you want to set a ToolTip but keep the DisplayMemberPath, you can do it at the ItemContainerStyle:

<ListBox x:Name="lstToys" Style="{DynamicResource ListBoxStyle1}"  
         ItemsSource="{Binding Strings}" DisplayMemberPath="Toys">
    <ListBox.ItemContainerStyle>
        <Style TargetType="ListBoxItem">
            <Setter Property="ToolTip" Value="Here's a tooltip!"/>
        </Style>
    </ListBox.ItemContainerStyle>
</ListBox>

我建议不要这样做.请记住，使用 DisplayMemberPath 会阻止您在数据模板中进行任何复杂的绑定.

I'd advise against it. Remember that use DisplayMemberPath stops you from any complex binding in your data template.

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