TextBlock样式触发器

问题描述

我想合并来自两个不同ViewModel的DisplayName，但是只有在第一个不等于NullObject的情况下才可以.

I would like to combine the DisplayNames from two different ViewModels, but only IF the first is not equal to a NullObject.

我可以在转换器或父视图模型中轻松完成此操作，但希望我使用DataTrigger的尝试可以轻松解决.

I could easily do this in either a converter or a parent view model, but am hoping my attempt at using DataTrigger has an easy fix.

干杯，贝里

这什么也不显示:

        <TextBlock Grid.Column="2" Grid.Row="0" >
            <TextBlock.Inlines>
                <Run Text="{Binding HonorificVm.DisplayName}"/>
                <Run Text="{Binding PersonNameVm.DisplayName}"/>
            </TextBlock.Inlines>
            <TextBlock.Style>
                <Style TargetType="{x:Type TextBlock}">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding HonorificVm.Honorific}" Value="{x:Static model:Honorific.NullHonorific}">
                            <Setter Property="Text" Value="PersonNameVm.DisplayName"/>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </TextBlock.Style>
        </TextBlock>

推荐答案

我将其分为两个TextBlocks，仅使用触发器更改可见性.通过使用Inlines并尝试在触发器中更改Text，您可能会遇到优先级问题，并且Inlines无法提取到Setter.

I would split it into two TextBlocks and only change the visibility using a trigger. By using the Inlines and trying to change the Text in the triggers you probably run into precedence problems and the Inlines cannot be extracted to a Setter.

例如

<StackPanel Grid.Column="2" Grid.Row="0" Orientation="Horizontal">
  <TextBlock Text="{Binding HonorificVm.DisplayName}" Margin="0,0,5,0">
    <TextBlock.Style>
      <Style TargetType="TextBlock">
        <Style.Triggers>
          <DataTrigger Binding="{Binding HonorificVm.Honorific}"
                       Value="{x:Static model:Honorific.NullHonorific}">
            <Setter Property="Visibility" Value="Collapsed" />
          </DataTrigger>
        </Style.Triggers>
      </Style>
    </TextBlock.Style>
  </TextBlock>
  <TextBlock Text="{Binding PersonNameVm.DisplayName}" />
</StackPanel>

---

另一个选择是MultiBinding而不是Inlines:

---

An alternative would be a MultiBinding instead of Inlines:

<TextBlock Grid.Column="2" Grid.Row="0">
  <TextBlock.Style>
    <Style TargetType="{x:Type TextBlock}">
      <Setter Property="Text">
        <Setter.Value>
          <MultiBinding StringFormat="{}{0} {1}">
            <Binding Path="HonorificVm.DisplayName" />
            <Binding Path="PersonNameVm.DisplayName" />
          </MultiBinding>
        </Setter.Value>
      </Setter>
      <Style.Triggers>
        <DataTrigger Binding="{Binding HonorificVm.Honorific}"
                     Value="{x:Static model:Honorific.NullHonorific}">
          <Setter Property="Text" Value="{Binding PersonNameVm.DisplayName}" />
        </DataTrigger>
      </Style.Triggers>
    </Style>
  </TextBlock.Style>
</TextBlock>

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