Question

我需要使用listview

中的数据生成array

我的XAML是：

<Page.Resources>
        <DataTemplate x:Key="IconTextDataTemplate">
            <StackPanel Orientation="Horizontal" Width="220" Height="60">
                <Border Background="#66727272" Width="40" Height="40" Margin="10">
                    <Image Source="/SampleImage.png" Height="32" Width="32" Stretch="UniformToFill"/>
                </Border>
                <StackPanel Orientation="Vertical" VerticalAlignment="Center">
                    <TextBlock x:Name="Name" Margin="10,0,0,0" Width="170" Height="20" TextTrimming="WordEllipsis" Loaded="Name_Loaded"/>
                    <TextBlock x:Name="Description" Margin="10,0,0,0" Width="170" Height="20" TextTrimming="WordEllipsis" Loaded="Description_Loaded"/>
                </StackPanel>
            </StackPanel>
        </DataTemplate>
</Page.Resources>
<ListView x:Name="IconTextGrid" Height="400" ItemTemplate="{StaticResource IconTextDataTemplate}" Grid.Row="4" Margin="40,40,40,10" HorizontalAlignment="Stretch">
                    <ListView.ItemsPanel>
                        <ItemsPanelTemplate>
                            <ItemsWrapGrid MaximumRowsOrColumns="8"/>
                        </ItemsPanelTemplate>
                    </ListView.ItemsPanel>
                </ListView>

和C＃代码：

private async void SearchBox_QuerySubmitted(SearchBox sender, SearchBoxQuerySubmittedEventArgs args)
    {
        foreach (var item in results)
        {
            IconTextGrid.Items.Add("");
            nameStr = item.FirstName + " " + item.LastName;
            descriptionStr = item.Email;
        }
    }


    public T FindElementByName<T>(DependencyObject element, string sChildName) where T : FrameworkElement
    {
        T childElement = null;
        var nChildCount = VisualTreeHelper.GetChildrenCount(element);
        for (int i = 0; i < nChildCount; i++)
        {
            FrameworkElement child = VisualTreeHelper.GetChild(element, i) as FrameworkElement;

            if (child == null)
                continue;

            if (child is T && child.Name.Equals(sChildName))
            {
                childElement = (T)child;
                break;
            }

            childElement = FindElementByName<T>(child, sChildName);

            if (childElement != null)
                break;
        }
        return childElement;
    }

    private void Name_Loaded(object sender, RoutedEventArgs e)
    {
        TextBlock Name = FindElementByName<TextBlock>(this, "Name");
        Name.Text = nameStr;
    }

    private void Description_Loaded(object sender, RoutedEventArgs e)
    {
        TextBlock Description = FindElementByName<TextBlock>(this, "Description");
        Description.Text = descriptionStr;
    }

此代码应生成包含一些项目（在数组大小中）的列表视图，并将每个项目中的数据放入数组中。问题是，只有在一个项目中，我才能看到数组中的数据，而其他项目则没有。希望得到帮助，谢谢

Answer 1

您的代码失败的原因至少有一个：

    foreach (var item in results)
    {
        IconTextGrid.Items.Add("");
        nameStr = item.FirstName + " " + item.LastName;
        descriptionStr = item.Email;
    }

您似乎将nameStr和descriptionStr存储到字段中。但是您只存储结果中的最后一项。

好消息是，您可以一次性简化和修复代码。使用

    foreach (var item in results)
    {
        var nameStr = item.FirstName + " " + item.LastName;
        var descriptionStr = item.Email;
        IconTextGrid.Items.Add(new { Name = nameStr, Description = descriptionStr });
    }

这将为Name元素创建具有Description和ListView属性的匿名类型。然后您可以使用：

    <DataTemplate x:Key="IconTextDataTemplate">
        <StackPanel ...>
                <Image .../>
            </Border>
            <StackPanel ...>
                <TextBlock Text="{Binding Name}" Margin="10,0,0,0" Width="170" Height="20" TextTrimming="WordEllipsis"/>
                <TextBlock Text="{Binding Description} Margin="10,0,0,0" Width="170" Height="20" TextTrimming="WordEllipsis"/>
            </StackPanel>
        </StackPanel>
    </DataTemplate>

并移除您的FindElementByName，Name_Loaded和Description_Loaded方法。

在ListVIew中生成项目

1 个答案: