Question

我有两个TextBox，我希望第二个TextBox的宽度为第一个TextBox宽度的一半。

<TextBox x:Name="txtBox1" />

<TextBox x:Name="txtBox2" Width = "{Binding ElementName=txtBox1,Path=ActualWidth/2}"/>

Answer 1

实现它的另一种方法。

   <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="2*"></ColumnDefinition>
            <ColumnDefinition Width="*"></ColumnDefinition>
        </Grid.ColumnDefinitions>
        <TextBox></TextBox>
        <TextBox Grid.Column="1"></TextBox>
    </Grid>

Answer 2

不可能在xaml中使用算术动作，或者将其写入

后面的代码中

txtBox2.Width = txtBox1.Width / 2;

或者创建一个转换器来执行此操作：

public class WidthToHalfConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (double)value / 2;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return null;
    }
}

XAML：

<Window.Resources>
    <me:WidthToHalfConverter x:Key="converter" />
</Window.Resources>
...
<TextBox x:Name="txtBox2" Width = "{Binding ElementName=txtBox1,Path=ActualWidth, Converter={StaticResource converter}}"/>

Answer 3

你必须为它创建转换器。您可以使用IValueConverter获取更多详细信息，您可以使用提及的链接Click

Answer 4

使用IValueConverter存档此

public class MyConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if ((double)value > 0)
        {
            return (double)value / 2;
        }

        return value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return null;
    }
}

XAML

<Window x:Class="WpfApplication1.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:w="clr-namespace:WpfApplication1"
    Title="MainWindow"
    Height="350"
    Width="525">
<Window.Resources>
    <w:MyConverter x:Key="MyConverter" />
</Window.Resources>
<Grid>
    <StackPanel>
        <TextBox Name="cmb1"
                 SelectionChanged="cmb1_SelectionChanged" />
        <TextBox Name="cmb2"
                 Width="{Binding ElementName=cmb1, Converter={StaticResource MyConverter},Path=ActualWidth}" />
    </StackPanel>
</Grid>

文本框宽度的一半

4 个答案: