xamarin 表单可绑定属性无法正常工作

Question

我正在尝试创建如下所示的自定义视图在这里，我试图将一个集合从主页绑定到自定义视图

但这里绑定不正确

<ContentView.Content>
        <Grid
            x:Name="Layout"
            HorizontalOptions="FillAndExpand"
            VerticalOptions="FillAndExpand">

            <Grid.RowDefinitions>
                <RowDefinition Height="Auto"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>

            <StackLayout
                Grid.Row="0"
                BackgroundColor="#E0E0E0"
                Padding="20,10">
                <Label Text="{Binding Source={x:Reference ExpandableContentView}, Path=Header}"/>
            </StackLayout>

            <StackLayout
                Grid.Row="1"
                BindableLayout.ItemsSource="{Binding Source={x:Reference ExpandableContentView}, Path=SummeryList}">

                <Label Text="{Binding Test}"/>
            </StackLayout>

        </Grid>
    </ContentView.Content>

xmal.cs 文件

public partial class ExpandableView : ContentView
    {
        public static readonly BindableProperty HeaderProperty = BindableProperty.Create(
            nameof(Header),
            typeof(string),
            typeof(ExpandableView),
            default(string));

        public static readonly BindableProperty SummeryListProperty = BindableProperty.Create(
            nameof(SummeryList),
            typeof(ObservableCollection<SummeryDetailModel>),
            typeof(ExpandableView),
            propertyChanged: CollectionChanged);

        private static void CollectionChanged(BindableObject bindable, object oldValue, object newValue)
        {
        }

        public ExpandableView()
        {
            InitializeComponent();
        }

        public string Header
        {
            get => (string)GetValue(HeaderProperty);
            set => SetValue(HeaderProperty, value);
        }

        public ObservableCollection<SummeryDetailModel> SummeryList
        {
            get => (ObservableCollection<SummeryDetailModel>)GetValue(SummeryListProperty);
            set => SetValue(SummeryListProperty, value);
        }

我正在 MainPage 中进行绑定，如下所示

<commonviews:ExpandableView
            Header="Shipment Details"
            SummeryList="{Binding SummeryCollection}">
        </commonviews:ExpandableView>

我的 SummeryDetailModel 喜欢

public class SummeryDetailModel
    {
        public string Test { get; set; }
    }

此处未将 Test 值绑定到标签。

我错过了什么吗？

Answer 1

我刚刚弄明白了，我犯了一个小错误。

我没有为 StackLayout BindableLayout[ 添加 Itemtemplate DataTemplate =21=]

如下

<StackLayout Grid.Row="1" Padding="20,10" Spacing="15" BindableLayout.ItemsSource="{Binding Source={x:Reference ExpandableContentView}, Path=SummeryList}"> <BindableLayout.ItemTemplate> <DataTemplate> <StackLayout Spacing="10"> <Label Text="{Binding Title}" FontFamily="{StaticResource LatoRegular}" FontSize="{StaticResource FontSize14}" TextColor="{StaticResource PlaceholderColor}"/> <Label Text="{Binding Detail}" FontFamily="{StaticResource LatoRegular}" FontSize="{StaticResource FontSize14}" TextColor="{StaticResource PrimaryText}"/> </StackLayout> </DataTemplate> </BindableLayout.ItemTemplate> </StackLayout>

xamarin 表单可绑定属性无法正常工作

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xamarin 表单可绑定 属性 无法正常工作

xamarin forms bindable property does not work properly

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xamarin 表单可绑定属性无法正常工作