WPF ListBox网格列无法填充列表数据问题求助

问题场景 #

业余项目中为WPF ListBox填充数据，复制了另一款可正常显示列格式的ListBox的XAML与代码，但新ListBox无内容显示。移除网格列格式后可正常加载数据，说明数据源无问题，问题出在列格式绑定上。

原代码 #

Rounds类 #

namespace BettingPoker
{
internal class Rounds 
{
private string  RoundName { get; set; }
private int RoundNumber { get; set; }


public Rounds(string roundname,  int roundnumber)
{
    this.RoundName = roundname;
    this.RoundNumber = roundnumber;
  
}
    public static List<Rounds> roundList = new List<Rounds>();

    public void TilføjTilRound(string name, int number)
    {
        roundList.Add(new Rounds(name, number));
    }


    public override string ToString()
    {
        if (RoundName != null)
            return RoundName + "  " + RoundNumber;
        return "Problem";
    }
}
}

XAML代码 #

<ListBox x:Name="listBoxRunder" Height="135" Margin="478,244,170,0" 
VerticalAlignment="Top" ItemsSource="{Binding}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <Grid Margin="0,2">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="10"></ColumnDefinition>
                    <ColumnDefinition Width="30"></ColumnDefinition>
                    <ColumnDefinition Width="2"></ColumnDefinition>
                    <ColumnDefinition Width="30"></ColumnDefinition>
                    <ColumnDefinition Width="2"></ColumnDefinition>
                  
                </Grid.ColumnDefinitions>

                <TextBox Text="{Binding RoundName}" Grid.Column="1"></TextBox>
                <TextBox Text="{Binding RoundNumber}" Grid.Column="3"></TextBox>
                
            </Grid>
        </DataTemplate>
      </ListBox.ItemTemplate>
</ListBox>

后台绑定代码 #

Rounds runde = new Rounds("", 0);
runde.TilføjTilRound("Blinds", 0);
runde.TilføjTilRound("Preflop", 1);
runde.TilføjTilRound("Flop", 2);
runde.TilføjTilRound("Turn", 3);
runde.TilføjTilRound("River", 4);

listBoxRunder.ItemsSource = Rounds.roundList;

问题原因 #

核心问题是Rounds类的RoundName和RoundNumber属性是private访问修饰符，WPF的数据绑定机制无法访问类的私有成员，导致模板中的TextBox无法获取到数据，所以显示为空。而移除网格列格式后，ListBox默认调用你重写的ToString()方法显示内容，所以能正常看到数据。

修改方案 #

将Rounds类的属性改为public，绑定机制就能正常读取属性值：

namespace BettingPoker
{
internal class Rounds 
{
// 改为public属性
public string RoundName { get; set; }
public int RoundNumber { get; set; }


public Rounds(string roundname, int roundnumber)
{
    this.RoundName = roundname;
    this.RoundNumber = roundnumber;
  
}
    public static List<Rounds> roundList = new List<Rounds>();

    public void TilføjTilRound(string name, int number)
    {
        roundList.Add(new Rounds(name, number));
    }


    public override string ToString()
    {
        if (RoundName != null)
            return RoundName + "  " + RoundNumber;
        return "Problem";
    }
}
}

额外优化建议 #

如果后续需要动态添加/删除数据时自动更新UI，可以把List<Rounds>替换为ObservableCollection<Rounds>，它实现了INotifyCollectionChanged接口，数据变化时会自动通知UI刷新：

public static ObservableCollection<Rounds> roundList = new ObservableCollection<Rounds>();

内容的提问来源于stack exchange，提问作者Jens Barfred