WPF TextBlock.TextTrimming不使用自动调整大小的ColumnDefinition

Question

我正在使用WPF网格作为窗口的布局.它有两列和任意数量的行.第一列专门用于标签,第二列用于用户输入字段(例如TextBox,ComboBox等).我的要求是:

1. 第一列的最小宽度必须为50,最大宽度必须为180.
2. 第一列必须调整其内容的大小,除非它违反第一个要求.
3. 第二列必须占用所有剩余空间.

我试过下面的XAML:

<Grid>
    <Grid.ColumnDefinitions>
       <ColumnDefinition Width="Auto" MinWidth="50" MaxWidth="180" />
       <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
       <RowDefinition Height="Auto" />
       <RowDefinition Height="Auto" />
       <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>

    <TextBlock Text="First Name" TextTrimming="CharacterEllipsis" />
    <TextBox Grid.Column="1" Text="{Binding FirstName}" />

    <TextBlock Grid.Row="1" Text="Family Name" TextTrimming="CharacterEllipsis" />
    <TextBox Grid.Row="1" Grid.Column="1" Text="{Binding FamilyName}" />

    <TextBlock Grid.Row="2" Text="Label That Won't Fit in 180 units" TextTrimming="CharacterEllipsis" />
    <TextBox Grid.Row="2" Grid.Column="1" Text="{Binding Text}" />
</Grid>

我希望第三行标签"不符合180个单位的标签"将被截断为"标签赢得......"之类的东西.相反,它被剪切到"标签不会",一半的"t"丢失.

我尝试了一种在网络上找到的不同方法.

<Grid>
    <Grid.ColumnDefinitions>
       <ColumnDefinition x:Name="LabelColumn" Width="Auto" MinWidth="50" MaxWidth="180" />
       <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
       <RowDefinition Height="Auto" />
       <RowDefinition Height="Auto" />
       <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>

    <TextBlock Width="{Binding ActualWidth, ElementName=LabelColumn}" Text="First Name" TextTrimming="CharacterEllipsis" />
    <TextBox Grid.Column="1" Text="{Binding FirstName}" />

    <TextBlock Grid.Row="1" Width="{Binding ActualWidth, ElementName=LabelColumn}" Text="Family Name" TextTrimming="CharacterEllipsis" />
    <TextBox Grid.Row="1" Grid.Column="1" Text="{Binding FamilyName}" />

    <TextBlock Grid.Row="2" Width="{Binding ActualWidth, ElementName=LabelColumn}" Text="Label That Won't Fit in 180 units" TextTrimming="CharacterEllipsis" />
    <TextBox Grid.Row="2" Grid.Column="1" Text="{Binding Text}" />
</Grid>

它最终处理Expression Blend(有时......),但在运行应用程序时却没有.运行时,所有标签完全消失.我通过监视窗口看到所有TextBlocks的实际宽度为0,而LabelColumn.ActualWidth等于80.

还有哪些其他选择？

Answer 1

你需要有MinWidth和MaxWidth上TextBlock的设置,如设置MinWidth和MaxWidth上栏定义并不总是荣幸渲染.在多个渲染过程中设置,ActualWidth在绑定表达式中使用可能会有问题,ActualWidth并且可能会产生不可预测的结果