没有从StackPanel获得价值

Question

我一直有一个问题，从堆栈面板获取确切的价值。

XAML

<Page 
x:Class="MedicinesApp.MainPage" 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
xmlns:local="using:MedicinesApp" 
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
mc:Ignorable="d"> 
<Page.Resources> 
    <CollectionViewSource x:Name="MedicinesCollectionViewSource" IsSourceGrouped="True" /> 
</Page.Resources> 
<GridView 
    ItemsSource="{Binding Source={StaticResource MedicinesCollectionViewSource}}" 
    x:Name="MedicinesGridView" 
    Padding="30,20,40,0" 
    SelectionMode="Single" 
    IsSwipeEnabled="false" 
    IsItemClickEnabled="True" SelectionChanged="MedicinesGridView_SelectionChanged" 
    ItemClick="MedicinesGridView_ItemClick"> 
    <GridView.ItemTemplate> 
     <DataTemplate x:Name="templateTrending"> 
      <Grid HorizontalAlignment="Left" Width="250" Height="250" x:Name="wow"> 
       <Border Background="{ThemeResource ListViewItemPlaceholderBackgroundThemeBrush}"> 
       <Image Source="{Binding Path=DiseaseImageSource}" Stretch="UniformToFill" AutomationProperties.Name="{Binding Title}"/> 
       </Border> 
       <StackPanel VerticalAlignment="Bottom" Background="{ThemeResource ListViewItemOverlayBackgroundThemeBrush}"> 
        <StackPanel Orientation="Vertical"> 
         <TextBlock Text="Disease Name" Foreground="{ThemeResource ListViewItemOverlayForegroundThemeBrush}" Style="{StaticResource TitleTextBlockStyle}" Height="30" Margin="15,0,15,0"/> 
         <TextBlock x:Name="DiseaseNameBro" Text="{Binding Path=DiseaseName, Mode=TwoWay}" Style="{StaticResource TitleTextBlockStyle}" Height="30" Margin="15,0,15,0"/> 
        </StackPanel> 
        <StackPanel Orientation="Vertical"> 
         <TextBlock Text="Category of Disease" Foreground="{ThemeResource ListViewItemOverlaySecondaryForegroundThemeBrush}" Style="{StaticResource CaptionTextBlockStyle}" TextWrapping="NoWrap" Margin="15,0,87,10"/> 
         <TextBlock Text="{Binding Path=CategoryOfDisease}" Foreground="{ThemeResource ListViewItemOverlaySecondaryForegroundThemeBrush}" Style="{StaticResource CaptionTextBlockStyle}" TextWrapping="NoWrap" Margin="15,0,15,10"/> 
        </StackPanel> 
       </StackPanel> 
      </Grid> 
     </DataTemplate> 
    </GridView.ItemTemplate> 
    <GridView.GroupStyle> 
     <GroupStyle> 
      <GroupStyle.HeaderTemplate> 
       <DataTemplate> 
        <TextBlock Text='{Binding Key}' Foreground="Gray" Margin="5" FontSize="30" FontFamily="Segoe UI Light" /> 
       </DataTemplate> 
      </GroupStyle.HeaderTemplate> 
      <GroupStyle.Panel> 
       <ItemsPanelTemplate> 
        <VariableSizedWrapGrid MaximumRowsOrColumns="2" Orientation="Horizontal" /> 
       </ItemsPanelTemplate> 
      </GroupStyle.Panel> 
     </GroupStyle> 
    </GridView.GroupStyle> 
    <GridView.ItemsPanel> 
     <ItemsPanelTemplate> 
      <ItemsWrapGrid GroupPadding="0,0,70,0" /> 
     </ItemsPanelTemplate> 
    </GridView.ItemsPanel> 
</GridView> 

C＃

using System.Collections.Generic; 
using System.Collections.ObjectModel; 
using System.Linq; 
using Windows.UI.Xaml.Controls; 

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238 

namespace MedicinesApp 
{ 
    /// <summary> 
    /// An empty page that can be used on its own or navigated to within a Frame. 
    /// </summary> 
    public sealed partial class MainPage : Page 
    { 
     public string getMedicinesName; 
     public ObservableCollection<Disease> diseaseList = new ObservableCollection<Disease>(); 
     public MainPage() 
     { 
      this.InitializeComponent(); 
      diseaseList.Add(new Disease { DiseaseName = "Malaria", DiseaseImageSource = "/Assets/133px-Malaria.jpg", CategoryOfDisease = "Blood" }); 
      diseaseList.Add(new Disease { DiseaseName = "Typhod", DiseaseImageSource = "../Assets/apple.jpg", CategoryOfDisease = "Thorat" }); 
      diseaseList.Add(new Disease { DiseaseName = "Cancer", DiseaseImageSource = "../Assets/orange.jpg", CategoryOfDisease = "Body" }); 
      diseaseList.Add(new Disease { DiseaseName = "Headache", DiseaseImageSource = "../Assets/bilberry.jpg", CategoryOfDisease = "Brain" }); 
      //diseaseList = new ObservableCollection<Disease>(diseaseList.OrderBy(c => c.DiseaseName)); 
      MedicinesCollectionViewSource.Source = GetGroupsByLetter(); 
     } 
     internal List<GroupInfoList<object>> GetGroupsByLetter() 
     { 
      var groups = new List<GroupInfoList<object>>(); 
      var query = from item in diseaseList 
         orderby item.DiseaseName 
         group item by item.DiseaseName[0] into g 
         select new { GroupName = g.Key, Items = g }; 
      foreach (var g in query) 
      { 
       var info = new GroupInfoList<object>(); 
       info.Key = g.GroupName; 
       foreach (var item in g.Items) 
       { 
        info.Add(item); 
       } 

       groups.Add(info); 
      } 
      return groups; 
     } 
     public class GroupInfoList<T> : List<object> 
     { 
      public object Key { get; set; } 

      public new IEnumerator<object> GetEnumerator() 
      { 
       return base.GetEnumerator(); 
      } 
     } 
     public class Disease 
     { 
      public string DiseaseName { get; set; } 
      public string DiseaseImageSource { get; set; } 
      public string CategoryOfDisease { get; set; } 
     } 
     private void MedicinesGridView_SelectionChanged(object sender, SelectionChangedEventArgs e) 
     { 
      getMedicinesName = ((Disease)MedicinesGridView.SelectedItem).DiseaseName; 
     } 
     private void MedicinesGridView_ItemClick(object sender, ItemClickEventArgs e) 
     { 
      this.Frame.Navigate(typeof(malaria), getMedicinesName); 
     } 
    } 

的问题是每当我点击疟疾， 它转到其他页面，显示癌症，这是第一个价值在列表中。 我怎样才能得到我点击的物品的价值而不是第一件物品的价值。我附上了截图，以便您更好地了解事物。

Answer 1

我看着你的代码，有一件事我不明白。 你为什么使用2个事件进行导航。只有一个人会完成这项工作。

private void MedicinesGridView_ItemClick(object sender, ItemClickEventArgs e) 
    { 
     var selectedDisease = e.ClickedItem as Disease; 
     this.Frame.Navigate(typeof(malaria), selectedDisease); 
    } 

您也不需要getMedicinesName。

不要忘记从你后面的代码和XAML中删除SelectionChanged事件。