Xamarin.forms Xamarin表单自定义内容视图（复合控件）隐式样式错误

这看起来应该很简单，但我一直无法找到解决方案

我在示例项目中定义了以下内容：

ReadOnlyField.xaml

<?xml version="1.0" encoding="UTF-8"?>

<ContentView x:Name="ReadOnlyFieldContentView" xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="TabbedPageDemo.Views.ReadOnlyField">
    <StackLayout Spacing="4">
        <Label FontSize="{Binding Source={x:Reference ReadOnlyFieldContentView}, Path=HeaderFontSize}" Text="{Binding Source={x:Reference ReadOnlyFieldContentView}, Path=HeaderText}" />
        <Label FontSize="{Binding Source={x:Reference ReadOnlyFieldContentView}, Path=DetailFontSize}" Text="{Binding Source={x:Reference ReadOnlyFieldContentView}, Path=DetailText}" />
    </StackLayout>
</ContentView>

<?xml version="1.0" encoding="utf-8" ?>

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:v="clr-namespace:TabbedPageDemo.Views" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="TabbedPageDemo.Views.Page2">
    <ContentPage.Resources>
        <Style TargetType="v:ReadOnlyField">
            <!-- <Setter Property="HeaderFontSize" Value="14" /> -->
            <!-- <Setter Property="DetailFontSize" Value="12" /> -->
        </Style>
    </ContentPage.Resources>

    <ScrollView x:Name="ScrollView1" Padding="4">
        <StackLayout x:Name="StackLayout0">
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 1" DetailText="Detail 1" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 2" DetailText="Detail 2" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 3" DetailText="Detail 3" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 4" DetailText="Detail 4" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 5" DetailText="Detail 5" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 6" DetailText="Detail 6" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 7" DetailText="Detail 7" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 8" DetailText="Detail 8" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 9" DetailText="Detail 9" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 10" DetailText="Detail 10" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 11" DetailText="Detail 11" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 12" DetailText="Detail 12" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 13" DetailText="Detail 13" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 14" DetailText="Detail 14" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 15" DetailText="Detail 15" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 16" DetailText="Detail 16" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 17" DetailText="Detail 17" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 18" DetailText="Detail 18" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 19" DetailText="Detail 19" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 20" DetailText="Detail 20" />
        </StackLayout>
    </ScrollView>
</ContentPage>

Page2.xaml

<?xml version="1.0" encoding="UTF-8"?>

<ContentView x:Name="ReadOnlyFieldContentView" xmlns="http://xamarin.com/schemas/2014/forms" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="TabbedPageDemo.Views.ReadOnlyField">
    <StackLayout Spacing="4">
        <Label FontSize="{Binding Source={x:Reference ReadOnlyFieldContentView}, Path=HeaderFontSize}" Text="{Binding Source={x:Reference ReadOnlyFieldContentView}, Path=HeaderText}" />
        <Label FontSize="{Binding Source={x:Reference ReadOnlyFieldContentView}, Path=DetailFontSize}" Text="{Binding Source={x:Reference ReadOnlyFieldContentView}, Path=DetailText}" />
    </StackLayout>
</ContentView>

<?xml version="1.0" encoding="utf-8" ?>

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" xmlns:v="clr-namespace:TabbedPageDemo.Views" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" x:Class="TabbedPageDemo.Views.Page2">
    <ContentPage.Resources>
        <Style TargetType="v:ReadOnlyField">
            <!-- <Setter Property="HeaderFontSize" Value="14" /> -->
            <!-- <Setter Property="DetailFontSize" Value="12" /> -->
        </Style>
    </ContentPage.Resources>

    <ScrollView x:Name="ScrollView1" Padding="4">
        <StackLayout x:Name="StackLayout0">
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 1" DetailText="Detail 1" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 2" DetailText="Detail 2" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 3" DetailText="Detail 3" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 4" DetailText="Detail 4" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 5" DetailText="Detail 5" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 6" DetailText="Detail 6" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 7" DetailText="Detail 7" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 8" DetailText="Detail 8" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 9" DetailText="Detail 9" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 10" DetailText="Detail 10" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 11" DetailText="Detail 11" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 12" DetailText="Detail 12" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 13" DetailText="Detail 13" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 14" DetailText="Detail 14" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 15" DetailText="Detail 15" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 16" DetailText="Detail 16" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 17" DetailText="Detail 17" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 18" DetailText="Detail 18" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 19" DetailText="Detail 19" />
            <v:ReadOnlyField HeaderFontSize="14" DetailFontSize="12" HeaderText="Header 20" DetailText="Detail 20" />
        </StackLayout>
    </ScrollView>
</ContentPage>

我想做的是使用隐式样式，比如我试图定义的样式，这样我就不必多次指定属性值

我错过了什么/做错了什么？

该错误是由访问修饰符引起的

请将

private

更改为

public

更改：

private static readonly BindableProperty DetailFontSizeProperty;
    private static readonly BindableProperty DetailTextProperty;
    private static readonly BindableProperty HeaderFontSizeProperty;
    private static readonly BindableProperty HeaderTextProperty;

public static readonly BindableProperty DetailFontSizeProperty;
    public static readonly BindableProperty DetailTextProperty;
    public static readonly BindableProperty HeaderFontSizeProperty;
    public static readonly BindableProperty HeaderTextProperty;

至：

private static readonly BindableProperty DetailFontSizeProperty;
    private static readonly BindableProperty DetailTextProperty;
    private static readonly BindableProperty HeaderFontSizeProperty;
    private static readonly BindableProperty HeaderTextProperty;

public static readonly BindableProperty DetailFontSizeProperty;
    public static readonly BindableProperty DetailTextProperty;
    public static readonly BindableProperty HeaderFontSizeProperty;
    public static readonly BindableProperty HeaderTextProperty;

您可以使用

x:Key属性定义
样式
，如下所示。该属性应与您定义的BindableProperty匹配

<ContentPage.Resources>
    <Style x:Key="ReadOnlyFieldStyle" TargetType="v:ReadOnlyField">
        <Setter Property="HeaderFontSize" Value="14" />    
        <Setter Property="DetailFontSize" Value="12" />
        <!--<Setter Property="HeaderText" Value="Header1"></Setter>
        <Setter Property="DetailText" Value="Detail"></Setter>-->
    </Style>




并使用该样式

<v:ReadOnlyField Style="{Binding StaticResource ReadOnlyFieldStyle}" HeaderText="Header 1" DetailText="Detail 1"></v:ReadOnlyField>
        <v:ReadOnlyField Style="{Binding StaticResource ReadOnlyFieldStyle}" HeaderText="Header 2" DetailText="Detail 2"></v:ReadOnlyField>



结果: