列表视图内的用户控件，windows phone 8.1

Posted 2023-04-12

【中文标题】列表视图内的用户控件，windows phone 8.1

【英文标题】：Usercontrol inside the listview, windows phone 8.1

【发布时间】：2017-12-05 22:37:19

【问题描述】：

我在将歌曲标题和艺术家绑定到列表视图中的 SongView 用户控件时遇到问题，代码如下：StartPage.xaml

    <ListView x:Name="PopularSongs" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <TextBlock Text="Binding Song.Title"/>
                        <local:SongView 
                            HorizontalAlignment="Stretch"
                            HorizontalContentAlignment="Stretch"
                            Song="Binding"/>
                    </StackPanel>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>

StartPage.cs

    public StartPage()
    
        this.InitializeComponent();

        this.DataContext = this;

        vm.NewSongs.Add( new Song()
        
            Artist = "Scorpions",
            Title = "Wind of Change",
            ImageURL = "http://images.45cat.com/scorpions-wind-of-changed-mercury.jpg",
            Length = 2.56,
            Size = 3.3
         );

        vm.NewSongs.Add(new Song()
        
            Artist = "Omega",
            Title = "Gyongihau Lany",
            ImageURL = "http://img11.nnm.me/b/d/c/b/7/bdcb701dbca19fde7fed545403f769fb_full.jpg",
            Length = 5.32,
            Size = 12
        );

        PopularSongs.ItemsSource = vm.NewSongs;
    

这里，vm.NewSongs 是 Song 类型的 ObservableCollection

SongView.xaml

    <UserControl
x:Class="soldo.SongView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:soldo"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
d:DesignHeight="60"
d:DesignWidth="300"
x:Name="root">
    <Grid Background="StaticResource ExtraLightGreyBrush" Margin="0,3,0,0" HorizontalAlignment="Stretch"> <StackPanel Grid.Column="1" Margin="5">
        <TextBlock FontFamily="StaticResource OpenSansRegular"
                   Text="Binding ElementName=root, Path=Song.Title, FallbackValue=Title"
                   Foreground="StaticResource BlackBrush"
                   FontSize="24"/>
        <TextBlock FontFamily="StaticResource OpenSansBold"
                   Text="Binding ElementName=root, Path=Song.Artist, FallbackValue=Artist"
                   FontSize="15"
                   Margin="0,-5,0,0"
                   Foreground="StaticResource OrangeBrush"/> 
 </Grid>

</UserControl>

SongView.cs

 public static readonly DependencyProperty SongProperty = DependencyProperty.Register(
        "Song",
        typeof(Song),
        typeof(SongView),
        new PropertyMetadata(string.Empty)
    );

    public Song Song
    
        get
        
            return GetValue(SongProperty) as Song;
        
        set
        
            SetValue(SongProperty, value);
        
       

输出中有一些绑定错误，但我不知道为什么会出现

【问题讨论】：

什么是绑定错误？

另外，StartPage 上文本块的绑定应该是Binding Path=Title

错误：BindingExpression 路径错误：在 'soldo.Song、soldo、Version=1.0.0.0、Culture=neutral、PublicKeyToken=null' 上找不到 'Title' 属性

输出显示 10 个类似这样的错误，例如“未找到艺术家”属性等。

更改绑定路径=标题没有帮助

【参考方案1】：

在 Windows Phone 上，数据绑定不适用于字段。确保您只绑定属性。