绑定到 WPF ToggleButton 的 IsChecked 状态
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Binding to a WPF ToggleButton's IsChecked state
提问by M. Dudley
I would like to use a WPF ToggleButtonto expand and collapse some controls in my application. How can I use XAML to accomplish this?
我想使用 WPFToggleButton来展开和折叠我的应用程序中的一些控件。如何使用 XAML 来完成此操作？
I'm thinking that I could somehow bind the Visibilityattribute of some controls to the ToggleButton's IsCheckedstate, but I do not know how to do this.
我想我可以以某种方式将Visibility某些控件的属性绑定到ToggleButton'sIsChecked状态，但我不知道该怎么做。
Maybe I need to give my ToggleButtona Name, then bind using ElementName? Then I would need a ValueConverterfor converting between a boolean value and a Visibility, correct? How could I make a generic ValueConverterfor this purpose?
也许我需要给我的ToggleButtona Name，然后使用ElementName? 然后我需要ValueConverter在布尔值和可见性之间进行转换，对吗？我怎么能ValueConverter为此目的制作一个泛型？
回答by Martin Liversage
You need to bind the Visibilitythrough a converter:
您需要Visibility通过转换器绑定：
<Window
x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Window.Resources>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
</Window.Resources>
<StackPanel>
<ToggleButton x:Name="toggleButton" Content="Toggle"/>
<TextBlock
Text="Some text"
Visibility="{Binding IsChecked, ElementName=toggleButton, Converter={StaticResource BooleanToVisibilityConverter}}"/>
</StackPanel>
</Window>
In Silverlight there is no BooleanToVisibilityConverterbut it is easy to write your own with some added features:
在 Silverlight 中没有，BooleanToVisibilityConverter但可以很容易地编写自己的一些附加功能：
using System;
using System.Globalization;
using System.Windows;
using System.Windows.Data;
namespace WpfApplication1 {
public class BooleanToVisibilityConverter : IValueConverter {
public Object Convert(Object value, Type targetType, Object parameter, CultureInfo culture) {
if (targetType == typeof(Visibility)) {
var visible = System.Convert.ToBoolean(value, culture);
if (InvertVisibility)
visible = !visible;
return visible ? Visibility.Visible : Visibility.Collapsed;
}
throw new InvalidOperationException("Converter can only convert to value of type Visibility.");
}
public Object ConvertBack(Object value, Type targetType, Object parameter, CultureInfo culture) {
throw new InvalidOperationException("Converter cannot convert back.");
}
public Boolean InvertVisibility { get; set; }
}
}
Now you can specify a converter that maps trueto Collapsedand falseto Visible:
现在，您可以指定映射转换器true来Collapsed和false到Visible：
<BooleanToVisibilityConverter
x:Key="InverseBooleanToVisibilityConverter" InvertVisibility="True"/>
回答by itowlson
Use the BooleanToVisibilityConverter:
使用 BooleanToVisibilityConverter：
<BooleanToVisibilityConverter x:Key="bvc" />
<TextBlock Visibility="{Binding IsChecked, ElementName=toggle, Converter={StaticResource bvc}}" />
