我的项目需要根据是否设置了LeftAccessibilityName在可访问性树中添加或删除UI元素。为此，我将AutomationProperties.IsInAccessibleTree绑定到可访问性名称，然后使用IsStringNotNullOrEmpty转换器获取布尔值。每当我尝试导航到包含此控件的页面时，都会出现以下导航异常：

Id = 1, Status = RanToCompletion, Method = {null}, Result = NavigationResult { Success = False, Exception = Prism.Navigation.NavigationException: An error occurred while resolving the page. This is most likely the result of invalid XAML or other type initialization exception
 ---> System.Exception: Unable to create Page 'RegistrationUserDetailsPage'.
 ---> Prism.Ioc.ContainerResolutionException: An unexpected error occurred while resolving 'RegistrationUserDetailsPage'
 ---> System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
 ---> System.ArgumentException: targetType needs to be assignable from System.Boolean. (Parameter 'targetType')

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如果我删除转换器，我可以毫无问题地导航到我的页面。我尝试使用更详细的语法：

<Grid 
     xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
     xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
     xmlns:converters="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
     x:Name="This">
   <Grid.Resources>
        <ResourceDictionary>
            <converters:IsStringNotNullOrEmptyConverter x:Key="IsStringNotNullOrEmptyConverter"/>
        </ResourceDictionary>
    </Grid.Resources>

   <ContentView
        Grid.Column="0"
        AutomationProperties.IsInAccessibleTree="{Binding LeftAccessibilityName, Converter={StaticResource IsStringNotNullOrWhiteSpaceConverter}, Source={x:Reference This}}" />

...

型
但这并没有什么区别。
在我的MauiProgram.cs中，如果我像这样初始化社区工具包：.UseMauiCommunityToolkit(x => x.SetShouldSuppressExceptionsInConverters(true));问题也解决了，我可以导航到页面。

代码

<Grid
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:converters="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
    x:Name="This"
    ColumnDefinitions="*">

    <ContentView
        Grid.Column="0"
        AutomationProperties.IsInAccessibleTree="{Binding LeftAccessibilityName, Converter={converters:IsStringNotNullOrWhiteSpaceConverter}, Source={x:Reference This}}" />
</Grid>

型