如何显示/隐藏 DataTemplates UWP

Question

我正在忙于 UWP 应用程序。我有一个网格视图，其中包含数据模板项。设置如下：

<GridView ItemsSource="{x:Bind location}">
 <GridView.ItemTemplate>
  <DataTemplate  x:Name="columnTemplate" x:DataType="data:Locations">
   <StackPanel x:Name="columnStack">
    <Image Width="100" Source="{x:Bind locationColumnImage}"/>
    <TextBlock FontSize ="16" Text ="{x:Bind numberOfBales}" 
    HorizontalAlignment="Center"/>                           
   </StackPanel>
  </DataTemplate>
 </GridView.ItemTemplate>
</GridView>

它是从我应用程序的 Models 文件夹中的 class 绑定的。 class 看起来像这样； public class 位置管理器

 {
    public  List<Locations> getLocations()
    {
        //represents db value of how many items in a particlar location
        var baleCol = buildColumnList(); 
        var location = new List<Locations>();
        location.Add(new Locations { locationColumn = "A", locationColumnImage = "Assets/A.jpg", numberOfBales = baleCol.Where(a => a != null && a.StartsWith("A")).Count() });
        location.Add(new Locations { locationColumn = "B", locationColumnImage = "Assets/B.jpg", numberOfBales = baleCol.Where(a => a != null && a.StartsWith("B")).Count() });
        location.Add(new Locations { locationColumn = "C", locationColumnImage = "Assets/c.jpg", numberOfBales = baleCol.Where(a => a != null && a.StartsWith("C")).Count() });
        location.Add(new Locations { locationColumn = "D", locationColumnImage = "Assets/D.jpg", numberOfBales = baleCol.Where(a => a != null && a.StartsWith("D")).Count() });
        location.Add(new Locations { locationColumn = "E", locationColumnImage = "Assets/E.jpg", numberOfBales = baleCol.Where(a => a != null && a.StartsWith("E")).Count() });
        location.Add(new Locations { locationColumn = "F", locationColumnImage = "Assets/F.jpg", numberOfBales = baleCol.Where(a => a != null && a.StartsWith("F")).Count() });
        location.Add(new Locations { locationColumn = "G", locationColumnImage = "Assets/G.jpg", numberOfBales = baleCol.Where(a => a != null && a.StartsWith("G")).Count() });
  return Locations;
  }
 }
}

它基本上是在一个网格中显示一个字母（a 到 G）的图像，然后在该字母下方显示一个数字（取决于有多少/如果有任何字母在其位置 A、B、C 中存储了一个项目。 ..)

我想知道的是，如果我不想显示图像下方带有 0 的项目（如果 G 中没有存储任何内容，则不显示它）我该怎么做？

Answer 1

在您的 return 语句中而不是

return location;

改为

return location.Where(a => a.numberOfBales > 0);

这样您将只会收到计数 > 0 的项目，并且只会显示那些项目。

如何显示/隐藏 DataTemplates UWP

How to show / hide DataTemplates UWP

c#

uwp

uwp-xaml

visual-studio-2017