我有一个长列表选择器的问题...我正在通过json webservice填充列表，当一个集合IsGroupingEnabled =＆＃34; true＆＃34;列表没有显示...如果我改为IsGroupingEnabled =＆＃34; false＆＃34;列表显示正确但不会出现分组的字母......
这是我的代码
XAML
<phone:PhoneApplicationPage
x:Class="PhoneApp4.MainPage"
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"
mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
SupportedOrientations="Portrait" Orientation="Portrait"
shell:SystemTray.IsVisible="True">
<phone:PhoneApplicationPage.Resources>
<DataTemplate x:Key="ListTemplate">
<StackPanel VerticalAlignment="Top" Orientation="Horizontal">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="300" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<Image Width="150"
Height="150"
Grid.RowSpan="2"
Grid.Column="0"
Source="{Binding foto1}"
Margin="10"
VerticalAlignment="Top">
</Image>
<TextBlock FontWeight="Bold"
Foreground="{StaticResource PhoneAccentBrush}"
FontSize="20"
Text="{Binding nome}"
Grid.Row="1"
Grid.Column="1"
TextWrapping="Wrap" />
<Button x:Name="gps"
Grid.Row="1"
Grid.Column="2"
Height="75"
Content="GPS"
Click="gps_Click"
Margin="90"/>
</Grid>
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="ListGroupHeaderTemplate">
<Border Padding="5">
<Border BorderBrush="{StaticResource PhoneAccentBrush}" BorderThickness="2" Width="62"
Height="62" Margin="0,0,18,0" HorizontalAlignment="Left">
<TextBlock Text="{Binding Key}" Foreground="{StaticResource PhoneForegroundBrush}" FontSize="48" Padding="6"
FontFamily="{StaticResource PhoneFontFamilySemiLight}" HorizontalAlignment="Left" VerticalAlignment="Center"/>
</Border>
</Border>
</DataTemplate>
<phone:JumpListItemBackgroundConverter x:Key="BackgroundConverter"/>
<phone:JumpListItemForegroundConverter x:Key="ForegroundConverter"/>
<Style x:Key="ListJumpListStyle" TargetType="phone:LongListSelector">
<Setter Property="GridCellSize" Value="113,113"/>
<Setter Property="LayoutMode" Value="Grid" />
<Setter Property="ItemTemplate">
<Setter.Value>
<DataTemplate>
<Border Width="113" Height="113" Margin="6" >
<TextBlock Text="{Binding Key}" FontFamily="{StaticResource PhoneFontFamilySemiBold}" FontSize="48" Padding="6"
Foreground="{Binding Converter={StaticResource ForegroundConverter}}" VerticalAlignment="Center"/>
</Border>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>
</phone:PhoneApplicationPage.Resources>
<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot">
<Grid.RowDefinitions>
<RowDefinition Height="80"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!--header-->
<StackPanel Grid.Row="0" Background="Red" Orientation="Horizontal">
<TextBlock Text="Teste" Margin="0,0,0,0" VerticalAlignment="Center" FontFamily="Segoe WP SemiLight" FontSize="36"/>
</StackPanel>
<!--LongListSelecttor binding with friends informations-->
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="5,0,0,0">
<phone:LongListSelector
ItemsSource="{Binding listaws}"
x:Name="lbResultado"
JumpListStyle="{StaticResource ListJumpListStyle}"
GroupHeaderTemplate="{StaticResource ListGroupHeaderTemplate}"
ItemTemplate="{StaticResource ListTemplate}"
LayoutMode="List"
IsGroupingEnabled="True"
HideEmptyGroups ="False"
/>
</Grid>
</Grid>
MAINPAGE.XAML.C $
using Microsoft.Phone.Controls;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Net;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Input;
using PhoneApp4;
using System.Threading;
using Newtonsoft.Json;
namespace PhoneApp4
{
public partial class MainPage : PhoneApplicationPage
{
List<Wsempresa> ListaWs = new List<Wsempresa>();
private const string DRIVING_PROTOCOL = "ms-drive-to";
// Constructor
public MainPage()
{
InitializeComponent();
// myButton.Click += new RoutedEventHandler(myButton_Click);
SortingListAZ();
string URL = "http://qualamelhormarca.com.br/novapasta/wsempresas.php";
this.Loaded += MainPage_Loaded;
WebClient client = new WebClient();
client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
client.OpenReadAsync(new Uri(URL, UriKind.Absolute));
//LayoutRoot.Opacity = 0.5;
lbResultado.IsEnabled = false;
}
private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
//List<Wsempresa> listaws = new List<Wsempresa>();
//List<AlphaKeyGroup<Wsempresa>> list = AlphaKeyGroup<Wsempresa>.CreateGroups(listaws, Thread.CurrentThread.CurrentUICulture, c => c.nome, true);
//lbResultado.ItemsSource = list;
}
//void myButton_Click(object sender, RoutedEventArgs e)
//{
// string URL = "http://192.168.1.4/QualAMelhorMarca/Divulguefranca/controller/wsempresas.php";
// WebClient client = new WebClient();
// client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
// client.OpenReadAsync(new Uri(URL, UriKind.Absolute));
// LayoutRoot.Opacity = 0.5;
// lbResultado.IsEnabled = false;
// // busca.Visibility = System.Windows.Visibility.Visible;
// myButton.Visibility = System.Windows.Visibility.Collapsed;
// //txtbusca.Visibility = System.Windows.Visibility.Visible;
// // pesquisar.Visibility = System.Windows.Visibility.Visible;
//}
private void SortingListAZ()
{
List<AlphaKeyGroup<Wsempresa>> DataSource = AlphaKeyGroup<Wsempresa>.CreateGroups(ListaWs,
System.Threading.Thread.CurrentThread.CurrentUICulture,
(Wsempresa s) => { return s.nome; }, true);
lbResultado.ItemsSource = DataSource;
}
void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
{
DataContractJsonSerializer json =
new DataContractJsonSerializer(typeof(Wsempresa));
Wsempresa lista = (Wsempresa)json.ReadObject(e.Result);
ObservableCollection<Wsempresa> wsempresa = new ObservableCollection<Wsempresa>();
try
{
// var root = JsonConvert.DeserializeObject<Wsempresa>(e.Result);
Wsempresa root = (Wsempresa)json.ReadObject(e.Result);
if (wsempresa.Count != 0)
{
wsempresa.Clear();
}
foreach (Wsempresa wsempresas in root.wsempresas)
{
Wsempresa list = wsempresas;
wsempresa.Add(list);
}
}
catch (Exception ex)
{
}
this.lbResultado.ItemsSource = wsempresa;
// lbResultado.ItemsSource = wsempresa;
// lbResultado.ItemsSource = lista.wsempresas;
// LayoutRoot.Opacity = 1;
lbResultado.IsEnabled = true;
}
[DataContract(Name = "wsempresa")]
public class Wsempresa
{
[DataMember(Name = "nome")]
public string nome { get; set; }
[DataMember(Name = "foto1")]
public string foto1 { get; set; }
[DataMember(Name = "telefone_comercial")]
public string telefone_comercial { get; set; }
[DataMember(Name = "latitude")]
public string latitude { get; set; }
[DataMember(Name = "longitude")]
public string longitude { get; set; }
[DataMember(Name = "wsempresas")]
public Wsempresa[] wsempresas { get; set; }
}
public class RootObject
{
public List<Wsempresa> wsempresas { get; set; }
}
void gps_Click(object sender, RoutedEventArgs e)
{
Wsempresa wsempresa = (Wsempresa)((Button)sender).DataContext;
string latitude = wsempresa.latitude;
string longitude = wsempresa.longitude;
string nome = wsempresa.nome;
string uriProtocol = null;
string uri;
// Driving or walking directions?
string buttonClicked = ((Button)sender).Name;
switch (buttonClicked)
{
case "gps":
uriProtocol = DRIVING_PROTOCOL;
break;
default:
uriProtocol = DRIVING_PROTOCOL;
break;
}
// Assemble the Uri for the request.
uri = uriProtocol + ":?" +
"destination.latitude=" + latitude + "&" +
"destination.longitude=" + longitude + "&" +
"destination.name=" + nome;
// Make the request.
RequestDirections(uri);
}
async void RequestDirections(string uri)
{
// Make the request.
var success = await Windows.System.Launcher.LaunchUriAsync(new Uri(uri));
if (success)
{
// Request succeeded.
}
else
{
// Request failed.
}
}
}
}
AlphaKeyGroup.c $
using Microsoft.Phone.Globalization;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace PhoneApp4
{
public class AlphaKeyGroup<T> : List<T>
{
/// <summary>
/// O delegate que é usado para obter a informação da chave
/// </summary>
/// <param name="item">Um objeto do tipo T</param>
/// <returns>O valor da chave usado para esse objeto</returns>
public delegate string GetKeyDelegate(T item);
/// <summary>
/// A chave deste grupo
/// </summary>
public string Key { get; private set; }
/// <summary>
/// Construtor público
/// </summary>
/// <param name="key"></param>
public AlphaKeyGroup(string key)
{
Key = key;
}
/// <summary>
/// Cria uma lista de AlphaKeyGroup<T> com chaves "setadas" por um SortedLocaleGrouping
/// </summary>
/// <param name="slg"></param>
/// <returns>Fonte de dados para o LongListSelector</returns>
private static List<AlphaKeyGroup<T>> CreateGroups(SortedLocaleGrouping slg)
{
List<AlphaKeyGroup<T>> list = new List<AlphaKeyGroup<T>>();
foreach (string key in slg.GroupDisplayNames)
{
list.Add(new AlphaKeyGroup<T>(key));
}
return list;
}
/// <summary>
/// Cria uma lista de AlphaGroup<T> com as chaves "setadas" por um SortedLocaleGrouping
/// </summary>
/// <param name="items">Os itens a serem colocados em grupo</param>
/// <param name="ci">A CultureInfo para ordenar e agrupar</param>
/// <param name="getKey">Um delegate para pegar a chave de um item</param>
/// <param name="sort">Irá ordenar os dados se for "true"</param>
/// <returns>Uma fonte de dados para o LongListSelector</returns>
public static List<AlphaKeyGroup<T>> CreateGroups(IEnumerable<T> items, CultureInfo ci, GetKeyDelegate getKey, bool sort)
{
SortedLocaleGrouping slg = new SortedLocaleGrouping(ci);
List<AlphaKeyGroup<T>> list = CreateGroups(slg);
foreach (T item in items)
{
int index = 0;
if (slg.SupportsPhonetics)
{
//index = slg.GetGroupIndex(getKey(Yomiof(item)));
}
else
{
index = slg.GetGroupIndex(getKey(item));
}
if (index >= 0 && index < list.Count)
{
list[index].Add(item);
}
}
if (sort)
{
foreach (AlphaKeyGroup<T> group in list)
{
group.Sort((c0, c1) => { return ci.CompareInfo.Compare(getKey(c0), getKey(c1)); });
}
}
return list;
}
}
}
注意：我在msdn论坛上提出了这个问题，答案是我的json没有从你的JSON调用中返回数据。 但是我发送了一些我的手机屏幕，显示我的json正在使用IsGroupingEnabled =＆＃34; False＆＃34 ;,如果我改为true，列表不会出现。 sreenshot在这里http://social.msdn.microsoft.com/Forums/en-US/b3074356-7924-42b4-bdd0-c2d5a8861d77/longlistselector-not-working-with-isgroupingenabledtrue?forum=wpdevelop&prof=required
答案 0 :(得分：0)
似乎问题在于client_OpenReadCompleted。
在您的代码中有
this.lbResultado.ItemsSource = wsempresa;
等等。
而不是你应该设置
ListaWs = wsempresa;
SortingListAZ();