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我有一个列表控件，每个项目包含两个图像和文本。在单击每个项目时，我想在所选列表项上隐藏或显示所选图像。

这是 XAML 代码片段：

            <ListBox x:Name="list" SelectionChanged="list_SelectionChanged"  >
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <TextBlock Text="{Binding Name}"/>
                        <Image Source="{Binding ImagePath}" Stretch="None"/>
                        <Image Source="{Binding ImagePath}" Stretch="None"  
                               Visibility="{Binding ImageVisibility, 
                            Converter={StaticResource boolVisibilityConverter}}" />
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

C#代码：

 dataSource = new ObservableCollection<ImageData>() 
        { 
        new ImageData(){Name = "User1:", ImagePath="/Images/user1.png", ImageVisibility = false},
        new ImageData(){Name = "User1:", ImagePath="/Images/user1.png", ImageVisibility = true},
        new ImageData(){Name = "User1:", ImagePath="/Images/user1.png", ImageVisibility = true},
        new ImageData(){Name = "User2:", ImagePath="/Images/user2.png", ImageVisibility = true}
        };

列表选择更改事件：

        private void list_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        ((ImageData)(((object[])(e.AddedItems))[0])).ImageVisibility = false;
        list.UpdateLayout();
    }

图像数据类：

 public class ImageData
    {
        public string ImagePath { get; set; }
        public string Name { get; set; }
        public bool ImageVisibility { get; set; }
    }

图像可见性转换器：

public class BooleanToVisibilityConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        bool flag = false;
        if (value is bool)
        {
            flag = (bool)value;
        }
        else if (value is bool?)
        {
            bool? nullable = (bool?)value;
            flag = nullable.HasValue ? nullable.Value : false;
        }
        return (flag ? Visibility.Visible : Visibility.Collapsed);
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return ((value is Visibility) && (((Visibility)value) == Visibility.Visible));
    }

}

请帮我完成这样的功能。

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1 回答 1

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您需要使用 INotifyPropertyChanged 接口http://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged.aspx

例如这样：

public class ImageData : INotifyPropertyChanged
{
    private bool _imageVisibility;
    public string ImagePath { get; set; }
    public string Name { get; set; }
    public bool ImageVisibility
    {
        get
        {
            return _imageVisibility;
        }
        set
        {
            _imageVisibility = value;
            OnPropertyChanged("ImageVisibility");
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;

    [NotifyPropertyChangedInvocator]
    protected virtual void OnPropertyChanged(string propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
    }
}

您可以在此处查看根据您的任务进行的全部更改（保管箱）

于 2013-03-06T07:19:59.130 回答