如何在UWP中使用BooleanToVisibilityConverter

Question

为了在UWP应用程序中制作汉堡包按钮，我尝试使用BooleanToVisibilityConverter来更改汉堡包按钮的状态，就像RSSReader示例一样 。

问题是，当我创建的文件夹中常见 BooleanToVisibilityConverter.cs写道：

using System;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Data;

namespace UWPTest.Common {
    public class BooleanToVisibilityConverter : IValueConverter {
        public object Convert(object value, Type targetType, object parameter, string language) =>
            (bool)value ^ (parameter as string ?? string.Empty).Equals("Reverse") ?
                Visibility.Visible : Visibility.Collapsed;

        public object ConvertBack(object value, Type targetType, object parameter, string language) =>
            (Visibility)value == Visibility.Visible ^ (parameter as string ?? string.Empty).Equals("Reverse");

    }
}

然后将其导入MainPage.xaml ：

<Page
    x:Class="UWPTest.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:UWPTest"
    xmlns:common="using:UWPTest.Common"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
    <Page.Resources>
        <common:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" />
    </Page.Resources>
    <Grid Background="Transparent">
        <ToggleButton x:Name="TogglePaneButton"
            Visibility="{x:Bind ViewModel.IsInDetailsMode, Mode=OneWay, ConverterParameter=Reverse, Converter={StaticResource BooleanToVisibilityConverter}}"
            Margin="0"
            TabIndex="1" 
            Checked="{x:Bind CheckTogglePaneButtonSizeChanged}"
            Unchecked="{x:Bind CheckTogglePaneButtonSizeChanged}"
            IsChecked="{Binding IsPaneOpen, ElementName=RootSplitView, Mode=TwoWay}"
            AutomationProperties.Name="Menu" ToolTipService.ToolTip="Menu"
            Style="{StaticResource SplitViewTogglePaneButtonStyle}"/>
    </Grid>
</Page>

IntelliSense说名称“BooleanToVisibilityConverter”在命名空间“using：UWPTest.Common”中不存在。 我无法弄清楚找不到课程的原因。

IntelliSense中文的图片：

Answer 1

当您将BooleanToVisibilityConverter添加到资源时，您将其设置为boolean的Key ：

<common:BooleanToVisibilityConverter x:Key="boolean" />

所以绑定应该如下所示：

Converter={StaticResource boolean}

或者您可以将Key值更改为BooleanToVisibilityConverter就像在示例中所做的那样。