如何摆脱 xaml WP8.1 中的命名空间错误

Question

我正在开发一个 Windows Phone 8.1 项目，我目前在使用我的 BooleanToVisibility 转换器时遇到问题。

这是转换器本身：

public class BooleanToVisibilityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        if (!(value is bool))
            return Visibility.Collapsed;
        bool objValue = (bool)value;
        if (objValue)
        {
            return Visibility.Visible;
        }
        return Visibility.Collapsed;

    }
    public object ConvertBack(object value, Type targetType, object parameter, string language)
    {
        throw new NotImplementedException();
    }
}

这是我的 Xaml：

<Page
x:Class="CityBox.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:views="using:CityBox.Views"
xmlns:converters="using:CityBox.Converters"
mc:Ignorable="d"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
DataContext="{Binding Main, Source={StaticResource Locator}}"
x:Name="MyMainPage">

<Page.Resources>
    <converters:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
</Page.Resources>


<Grid>
    <views:DataLoadingView x:Name="DataLoadingView" 
                           Visibility="{Binding LoadingViewVisibility, Converter={StaticResource BooleanToVisibilityConverter}}"/>
    <views:DrawerView  x:Name="DrawerView"  
                       Visibility="{Binding DrawerViewVisibility, Converter={StaticResource BooleanToVisibilityConverter}}" />
</Grid>
</Page>

最后是我的 ViewModel 中的布尔值：

private bool _loadingViewVisibility;
    private bool _drawerViewVisibility;

    public bool LoadingViewVisibility
    {
        get { return _loadingViewVisibility;}
        set
        {
            _loadingViewVisibility = value;
            RaisePropertyChanged("LoadingViewVisibility");
        }
    }
    public bool DrawerViewVisibility
    {
        get { return _drawerViewVisibility; }
        set
        {
            _drawerViewVisibility = value;
            RaisePropertyChanged("DrawerViewVisibility");
        }
    }

我不明白的一件事，我认为问题可能来自于在资源中（在 xaml 中），我有某种警告告诉我“BooleanToVisibilityConverter”不在指定的命名空间中，即很奇怪，因为它是由 resharper 自动添加的。我认为这只是 VS 的错误，有时会发生，但是当我更改布尔值时它不起作用。

希望我足够精确，可以帮助您！ 提前致谢， 纪尧姆。

编辑：我刚刚进行了一些测试，这里有一些有趣的东西：

    <Grid>
    <!--<TextBlock Text="Test1" Visibility="{Binding Test2, Converter={StaticResource BooleanToVisibilityConverter}}"/>
    <TextBlock Text="Test2" Visibility="{Binding Test1, Converter={StaticResource BooleanToVisibilityConverter}}"/>-->
    <views:LoadingView Visibility="{Binding Test2, Converter={StaticResource BooleanToVisibilityConverter}}"/>
        <views:DrawerView Visibility="{Binding Test1, Converter={StaticResource BooleanToVisibilityConverter}}"/>
</Grid>

如果我取消注释两个文本块并注释我的两个视图，那么它就可以工作。 如果我这样做，它不会。在每个视图中简单地放置一个文本块，上面写着“正在加载”和“抽屉”。在我取消注释两个视图并尝试通过将布尔设置为 false 来隐藏一个的情况下，这两个视图在屏幕上可见。如果我用两个文本框来做这件事就不会发生！

Answer 1

将您的 xml 更改为：

<Page
x:Class="CityBox.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:views="using:CityBox.Views"
mc:Ignorable="d"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"
DataContext="{Binding Main, Source={StaticResource Locator}}"
x:Name="MyMainPage">

<Page.Resources>
<BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
</Page.Resources>

<Grid>
<views:DataLoadingView x:Name="DataLoadingView" 
                       Visibility="{Binding LoadingViewVisibility, Converter={StaticResource BooleanToVisibilityConverter}}"/>
<views:DrawerView  x:Name="DrawerView"  
                   Visibility="{Binding DrawerViewVisibility, Converter={StaticResource BooleanToVisibilityConverter}}" />