Question

我在刷新listview数据时遇到问题。除非我致电：

，否则不会更新

List.ItemsSource = null;
List.ItemsSource = listviewSource;

这是有效但看起来不太好（屏幕闪烁）所以我想按照人们的建议使用INotifyPropertyChanged。

我的listviewSource是ObservableCollection＆lt;等级2＆GT; Class2实现Class1，Class1实现INotifyPropertyChanged。

public class Class1 : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    protected void NotifyPropertyChanged(string name)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(name));
        }
    }

    ...
}

public class Class2 : Class1
{

    private string ImgSource;

    public string imgSource
    {
        get { return this.ImgSource; }
        set
        {
            this.ImgSource = value;
            NotifyPropertyChanged("imgSource");
        }
    }

    ....
}

imgSource绑定到ListView但是当它发生变化时没有任何反应......我做错了什么？

XAML标记

<ListView x:Name="List" Width="400" HorizontalAlignment="Center" Loaded="List_Loaded">
        <ListView.ItemContainerStyle>
            <Style TargetType="ListViewItem">
                <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
                <Setter Property="VerticalContentAlignment" Value="Top"/>
                <Setter Property="HorizontalAlignment" Value="Stretch"/>
                <Setter Property="VerticalAlignment" Value="Top"/>
            </Style>
        </ListView.ItemContainerStyle>
        <ListView.ItemTemplate>
            <DataTemplate>
                <StackPanel Tag="{Binding number}" Background="#FF0E1D23" Margin="0,5" >
                        <Image Margin="339,10,23,13" Source="{Binding imgSource}"/>
                </StackPanel>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>

Answer 1

Image Source默认binding mode似乎是OneTime。

将其明确更改为OneWay：

Source="{Binding imgSource, Mode = OneWay}"

刷新ListView项目，将Image的Source绑定到属性

1 个答案: