Question

我正忙着使用UWP应用程序。我有一个带有数据模板项目的网格视图。它设置如下：

<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>

它绑定在我的应用程序的Models文件夹中的类中。那个班看起来像这样; 公共类locationManager

 {
    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图像一个字母（a到G），在该字母下面是一个数字（取决于有多少/如果任何一个字母有一个项目存储在它的位置A，B，C ... ）

我想知道的是，如果我不想显示图像下方有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return语句中而不是

android {
  compileSdkVersion 26
  buildToolsVersion '26.0.0-rc3'

  defaultConfig {
    targetSdkVersion 26
  }
  ...
}

dependencies {
  compile 'com.android.support:appcompat-v7:26.0.0-beta1'
}

// REQUIRED: Google's new Maven repo is required for the latest
// support library that is compatible with Android O
repositories {
    maven {
        url 'https://maven.google.com'
        // Alternative URL is 'https://dl.google.com/dl/android/maven2/'
    }
}

将其更改为

return location;

通过这种方式，您只会收到计数＆gt; 0并仅显示那些。

如何显示/隐藏DataTemplates UWP

1 个答案: