在 WPF 中动态更改网格的可见性 [英] Dynamically change the Visibility of a Grid in WPF

问题描述

我有一个带有 TextBlock 的 Grid:

I have a Grid with TextBlock in it:

<Grid x:Name="GridLayout" Margin="4,0,4,1" Grid.Row="2" Background="#accdd7">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>

    <TextBlock Name="Title" 
               Grid.Row="0"
               HorizontalAlignment="Stretch"
               Padding="10,2,10,2"
               Style="{StaticResource PromptTextStyle}" />
</Grid>

我正在以编程方式设置这个 TextBlock 值:

I am setting this TextBlock value programatically:

Title.Text = myObject.Title;

现在这里 myObject.Title 有时可能为 Null 或 Empty，那时我需要隐藏整个 Grid.

Now here myObject.Title may be Null or Empty sometimes at that time I need to hide this entire Grid.

如何做到这一点?

推荐答案

在 TextBlock 上设置 x:Name.然后在 Grid 的样式上应用 dataTriggers 以在 TextBlock 上将 Text 设置为 null 或空字符串时折叠可见性.

Set x:Name on TextBlock. Then apply dataTriggers on Grid's style to collapsed the visibility when Text is set to null or empty string on TextBlock.

    <Grid xmlns:sys="clr-namespace:System;assembly=mscorlib"
          x:Name="GridLayout" Margin="4,0,4,1" Grid.Row="2" Background="#accdd7">
        <Grid.RowDefinitions>
           <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>
        <TextBlock x:Name="Title" 
                   Grid.Row="0"
                   HorizontalAlignment="Stretch"
                   Padding="10,2,10,2"
                   Style="{StaticResource PromptTextStyle}"/>
        <Grid.Style>
            <Style TargetType="Grid">
                <Style.Triggers>
                    <DataTrigger Binding="{Binding Text, ElementName=Title}"
                                 Value="{x:Null}">
                        <Setter Property="Visibility" Value="Collapsed"/>
                    </DataTrigger>
                    <DataTrigger Binding="{Binding Text, ElementName=Title}" 
                                 Value="{x:Static sys:String.Empty}">
                        <Setter Property="Visibility" Value="Collapsed"/>
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </Grid.Style>
    </Grid>

这篇关于在 WPF 中动态更改网格的可见性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！