c# - 更新绑定(bind) Observable 集合的一个元素

Question

我有一个可观察的集合，里面有一个名为 songInfo 的自定义类。
它绑定(bind)到 ListView。这是绑定(bind)的代码:

C#:

var songData = new ObservableCollection<songInfo>();

public ObservableCollection<songInfo> _songData
{ 
    get 
    { 
        return songData; 
    } 
}

public class songInfo
{
    public string Title { get; set; }
    public string Artist { get; set; }
    public string Album { get; set; }
    public string Location { get; set; }
    public string Ext { get; set; }
    public bool isSongPlaying { get; set; }
}

XAML:

<Window x:Class="Genesis.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Genesis (Alpha)" Height="897" Width="882" Loaded="Window_Loaded"
    DataContext="{Binding RelativeSource={RelativeSource Self}}" Name="Genesis">

    <ListView Margin="12,39,0,0" Name="Library" DataContext="{Binding}" ItemsSource="{Binding _songData}" Height="681" VerticalAlignment="Top" MouseDoubleClick="Library_MouseDoubleClick"  ContextMenu="{StaticResource MyContextMenu}" AlternationCount="2" Background="AliceBlue" HorizontalAlignment="Left" Width="846">
        <ListView.View>
            <GridView x:Name="gvLibrary">
                <GridViewColumn Width="20" Header="hi" DisplayMemberBinding="{Binding isSongPlaying}" x:Name="gvColumnPlaying" />
                <GridViewColumn Width="220" Header="Title" DisplayMemberBinding="{Binding Title}" x:Name="gvColumnTitle" />
                <GridViewColumn Width="180" Header="Artist" DisplayMemberBinding="{Binding Artist}" x:Name="gvColumnArtist" />
                <GridViewColumn Width="180" Header="Album" DisplayMemberBinding="{Binding Album}" x:Name="gvColumnAlbum" />
                <GridViewColumn Width="180" Header="Location" DisplayMemberBinding="{Binding Location}" x:Name="gvColumnLocation" />
                <GridViewColumn Width="80" Header="File Type" DisplayMemberBinding="{Binding Ext}" x:Name="gvColumnFileType" />
            </GridView>
        </ListView.View>
    </ListView>

songInfo 在我的代码中的其他位置填充。添加或删除元素时，将更新 ListView。但是，有些时候我只是简单地更改 songInfo.Ext 或 songInfo.Location 等。我发现了一种复杂的方法来执行此操作并进行更新，但我不得不删除元素并重新添加它:

songInfo temp = songData[playing_song_index];
songData.RemoveAt(playing_song_index);
songData.Insert(playing_song_index, new songInfo()
{
    Title = temp.Title,
    Artist = temp.Artist,
    Album = temp.Album,
    Location = temp.Location,
    Ext = temp.Ext,
    isSongPlaying = true
});

这会将 isSongPlaying 更改为 true。

是否有更简单的方法来仅更新 GridView 的一个“列”？

Answer 1

您的songInfo 类需要实现INotifyPropertyChanged .

如果您正确实现此接口(interface)，则对类成员的更改将通过绑定(bind)自动反射(reflect)在用户界面中。