Question

我有一个Foos列表，每个都有Name，ImageUrl和IsSelected属性。图像显示在按钮内，IsSelected为真的图像周围有红色边框。徘徊在其他人周围也显示红色边框。一切正常。

但是当我点击另一个项目时，它会将IsSelected值更改为true（对于旧项目为false）。

ViewModel然后说NotifyOfPropertyChange（（）=＆gt; Foos）;

但边界没有任何反应。我试图按照这个例子https://stackoverflow.com/a/19319456无济于事。如果你能发现错误，下面是我的xaml代码。

CREATE TABLE IF NOT EXISTS myTable

Answer 1

我认为您的类Foo应该实现INotifyPropertyChanged并在IsSelected属性更改时调用事件ProprtyChanged。例如：

public class Foo : INotifyPropertyChanged
{
    private string _fooName;
    private bool _isSelected;

    protected void OnNotifyPropertyChanged(string property)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(property));
    }
    public event PropertyChangedEventHandler PropertyChanged;
    public string FooName { get => _fooName; set { _fooName = value; OnNotifyPropertyChanged(nameof(FooName)); } }
    public bool IsSelected { get => _isSelected; set { _isSelected = value; OnNotifyPropertyChanged(nameof(IsSelected)); } }
}

然后是list和Button click方法的示例实现：

public partial class MainWindow : Window
{
    public ObservableCollection<Foo> Foos { get; set; } 
        = new ObservableCollection<Foo>() { new Foo() { FooName = "A1" }, new Foo { FooName = "A2" }, new Foo() { FooName = "A3" } };
    public MainWindow()
    {
        InitializeComponent();
        this.DataContext = this;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        foreach (var foo in Foos)
            foo.IsSelected = false;
        foreach (var foo in Foos)
            if (foo.FooName == (sender as Button)?.Tag as string)
                foo.IsSelected = true;
    }
}

与ItemsControl和DataTrigger绑定的WPF数据

1 个答案: