c# - 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我正在尝试将主页中的集合绑定到自定义视图

但在这里它没有正确绑定。

<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; }
    }

这里它没有将测试值绑定到标签。

我在这里错过了什么？

score 0 · Accepted Answer

我只是弄清楚这一点，我犯了一个小错误。

我没有为StackLayout BindableLayout添加Itemtemplate DataTemplate

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>

c# - xamarin 表单可绑定属性无法正常工作

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