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我試圖在LongListSelector中獲取所選項目的值。 lls的內容是使用循環從xml文件寫入的。 但是，當我使用listFavs.SelectedItem.ToString();時，它不會返回所選項目中的文本。我究竟做錯了什麼？在longlistselector中獲取selected_item的值
C＃代碼：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System.Windows.Media;
using System.Collections.ObjectModel;
using System.Xml;
using PhoneApp2.Resources;
using System.Xml.Linq;
using System.IO;
using System.IO.IsolatedStorage;
using System.Windows.Resources;
namespace PhoneApp2
{
public class Favs
{
private string drank;
public string Name
{
get { return drank; }
set { drank = value; }
}
public Favs(string addition)
{
this.Name = addition;
}
}
public partial class Favorites : PhoneApplicationPage
{
ObservableCollection<Favs> Favlist = new ObservableCollection<Favs>();
public Favorites()
{
InitializeComponent();
if (ThemeUsed.DarkTheme == 1)
{
ImageBrush SettingsLite = new ImageBrush();
SettingsLite.ImageSource = new System.Windows.Media.Imaging.BitmapImage(new Uri(@"resources/dark theme/feature.settings.png", UriKind.Relative));
SettingsLite.Stretch = Stretch.Fill;
btnSettings.Background = SettingsLite;
}
else
{
ImageBrush SettingsDark = new ImageBrush();
SettingsDark.ImageSource = new System.Windows.Media.Imaging.BitmapImage(new Uri(@"resources/light theme/feature.settings.png", UriKind.Relative));
SettingsDark.Stretch = Stretch.Fill;
btnSettings.Background = SettingsDark;
}
//Menu (App bar)
ApplicationBar = new ApplicationBar();
ApplicationBar.Mode = ApplicationBarMode.Default;
ApplicationBar.Opacity = 0.5;
ApplicationBar.IsVisible = false;
ApplicationBar.IsMenuEnabled = true;
ApplicationBarIconButton btnAdd = new ApplicationBarIconButton();
btnAdd.IconUri = new Uri("resources/dark theme/add.png", UriKind.Relative);
btnAdd.Text = "Add to bar";
ApplicationBar.Buttons.Add(btnAdd);
btnAdd.Click += new EventHandler(btnAdd_Click);
ApplicationBarIconButton btnSortaz = new ApplicationBarIconButton();
btnSortaz.IconUri = new Uri("resources/dark theme/refresh.png", UriKind.Relative);
btnSortaz.Text = "Sort A/Z Z/A";
ApplicationBar.Buttons.Add(btnSortaz);
btnSortaz.Click += new EventHandler(btnSortaz_Click);
ApplicationBarIconButton btnSortdate = new ApplicationBarIconButton();
btnSortdate.IconUri = new Uri("resources/dark theme/feature.calendar.png", UriKind.Relative);
btnSortdate.Text = "Sort by date";
ApplicationBar.Buttons.Add(btnSortdate);
btnSortdate.Click += new EventHandler(btnSortdate_Click);
//Populate LLL listBar
listFavs.ItemsSource = Favlist;
try
{
// copy the xml file to isolated storage
using (IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication())
{
if (!file.FileExists("favorites.xml"))
{
StreamResourceInfo sr_en = Application.GetResourceStream(new Uri("Resources\\favorites.xml", UriKind.Relative));
using (BinaryReader br_en = new BinaryReader(sr_en.Stream))
{
byte[] data = br_en.ReadBytes((int)sr_en.Stream.Length);
//Write the file.
using (BinaryWriter bw = new BinaryWriter(file.CreateFile("favorites.xml")))
{
bw.Write(data);
bw.Close();
}
}
}
// work with file at isolatedstorage
using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream("favorites.xml", FileMode.Open, file))
{
XDocument xDoc = XDocument.Load(stream, LoadOptions.None);
var names = xDoc.Descendants("name").Select(n => n.Value).ToList();
foreach (string name in names)
{
Favlist.Add(new Favs(name));
}
}
}
}
catch (Exception myExc)
{
Console.WriteLine(myExc.Message);
}
}
private void btnSettings_Click(object sender, RoutedEventArgs e)
{
//Open/Close menu(app bar)
if (ApplicationBar.IsVisible == false)
{
ApplicationBar.IsVisible = true;
}
else
{
ApplicationBar.IsVisible = false;
}
}
private void btnSortaz_Click(object sender, EventArgs e)
{
//sort AZ ZA function here
ApplicationBar.IsVisible = false;
}
private void btnAdd_Click(object sender, EventArgs e)
{
//Add cocktail to bar function here
ApplicationBar.IsVisible = false;
}
private void btnSortdate_Click(object sender, EventArgs e)
{
//Sort by date function here
ApplicationBar.IsVisible = false;
}
private void listFavs_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
string text = listFavs.SelectedItem.ToString();
MessageBox.Show(text);
}
}
}
XAML代碼：
<phone:PhoneApplicationPage
x:Class="PhoneApp2.Favorites"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
mc:Ignorable="d"
shell:SystemTray.IsVisible="True">
<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot">
<Grid.Background>
<ImageBrush Stretch="Fill" ImageSource="/Assets/AlignmentGrid.png"/>
</Grid.Background>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!--TitlePanel contains the name of the application and page title-->
<!--ContentPanel - place additional content here-->
<!--ContentPanel - place additional content here-->
<!--ContentPanel - place additional content here-->
<Grid x:Name="Header" Grid.Row="0" Margin="12,17,0,616" Grid.RowSpan="2">
<TextBlock Text="Cocktail" Style="{StaticResource PhoneTextNormalStyle}" Margin="12,0,242,46"/>
<TextBlock Text="Favorites" Style="{StaticResource PhoneTextTitle1Style}" Margin="10,50,101,0" FontWeight="Bold"/>
<Button x:Name="btnSettings" Content="" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="367,60,0,-50" Height="86" Width="91" Click="btnSettings_Click">
<Button.Foreground>
<ImageBrush Stretch="Fill"/>
</Button.Foreground>
<!--<Button.Background>
<ImageBrush Stretch="Fill" ImageSource="feature.settings.png"/>
</Button.Background>-->
</Button>
</Grid>
<!--ContentPanel - place additional content here-->
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,157,12,0">
<phone:LongListSelector x:Name="listFavs" HorizontalAlignment="Left" Height="601" VerticalAlignment="Top" Width="456" SelectionChanged="listFavs_SelectionChanged">
<phone:LongListSelector.ItemTemplate>
<DataTemplate>
<Button Content="{Binding Name}" FontSize="36" HorizontalContentAlignment="left" HorizontalAlignment="Left" Height="82" Margin="0,-11,0,0" VerticalAlignment="Top" Width="456" Padding="0,0,0,0" BorderThickness="0">
</Button>
</DataTemplate>
</phone:LongListSelector.ItemTemplate>
</phone:LongListSelector>
</Grid>
</Grid>
</phone:PhoneApplicationPage>
看看你的DataTemplate =>你會得到一個按鈕，IL你會得到selectedItem var tb = selectedItem as Button; string cName = tb.Content; 。 – MatDev8