[英]Binding data to ListBox in xaml getting data from webservice
我有以下代碼：
using System;
using System.Collections.Generic;
using System.linq;
using System.Text;
using System.Threading.Tasks;
using System.Component-model;
namespace MEO.MODELS
{
public class Claims :INotifyPropertyChanged
{
public Claims()
{
}
private string description;
private string expenseHeaderId;
private string assginedTo;
private bool submitted;
private bool approved;
private bool authorised;
private DateTime updatedDate;
private DateTime createdDate;
private DateTime claimDate;
private DateTime lastModifiedDate;
private string expenseFormType;
public bool Approved
{
get
{
return this.approved;
}
set
{
if (value != this.approved)
{
this.approved = value;
this.NotfiyProperty("Approved");
}
}
}
public string AssignedTo
{
get
{
return this.assginedTo;
}
set
{
if (value != this.assginedTo)
{
this.assginedTo = value;
this.NotfiyProperty("AssignedTo");
}
}
}
public bool Authorised
{
get
{
return this.authorised;
}
set
{
if (value != authorised)
{
this.authorised = value;
this.NotfiyProperty("Authorised");
}
}
}
public bool Submitted
{
get
{
return this.submitted;
}
set
{
if (value != submitted)
{
this.submitted = value;
this.NotfiyProperty("Submitted");
}
}
}
public DateTime ClaimDate
{
get
{
return this.claimDate;
}
set
{
if (value != claimDate)
{
this.claimDate = value;
this.NotfiyProperty("ClaimDate");
}
}
}
public DateTime CreatedDate
{
get
{
return this.createdDate;
}
set
{
if (value != createdDate)
{
this.createdDate = value;
this.NotfiyProperty("CreatedDate");
}
}
}
public DateTime LastModifiedDate
{
get
{
return this.lastModifiedDate;
}
set
{
if (value != lastModifiedDate)
{
this.lastModifiedDate = value;
this.NotfiyProperty("LastModifiedDate");
}
}
}
public DateTime UpdatedDate
{
get
{
return this.updatedDate;
}
set
{
if (value != updatedDate)
{
this.updatedDate = value;
this.NotfiyProperty("UpdatedDate");
}
}
}
public string Description
{
get
{
return this.description;
}
set
{
if (value != this.description)
{
this.description = value;
this.NotfiyProperty("Description");
}
}
}
public string ExpenseFormType
{
get
{
return this.expenseFormType;
}
set
{
if (value != this.expenseFormType)
{
this.expenseFormType = value;
this.NotfiyProperty("ExpenseFormType");
}
}
}
public string ExpenseHeaderId
{
get
{
return this.expenseHeaderId;
}
set
{
if (value != this.expenseHeaderId)
{
this.expenseHeaderId = value;
this.NotfiyProperty("ExpenseHeaderId");
}
}
}
private void NotfiyProperty(string propertyName)
{
PropertyChangedEventHandler propertyChangedEventHandler = this.PropertyChanged;
if (propertyChangedEventHandler != null)
{
propertyChangedEventHandler.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
}
以下是包含一個Listbox的XAML。我必須綁定從Web服務獲取的數據，該數據通過在加載頁面時傳遞參數來調用稱為GetFullClaimLinesAsync的方法。
<phone:PhoneApplicationPage
x:Class="MEO.Views.Result"
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" Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" Margin="12,17,0,28" Grid.ColumnSpan="2">
<Button Content="My Expenses On line" Background="#00ccff" Grid.Row="5" FontWeight="Bold" Name="head" Margin="-23,0,-13,-98" Foreground="White" BorderThickness="0"/>
</StackPanel>
<!--ContentPanel - place additional content here-->
<Grid x:Name="ContentPanel" Margin="0,35,24,10" Grid.ColumnSpan="2"/>
<!--<Button Content="Get Full Claims" Background="#00ccff" FontWeight="Bold" x:Name="claim" Click="claim_Click" Margin="67,105,97,-203" Foreground="White" BorderThickness="0" Grid.Row="1" RenderTransformOrigin="0.676,0.469"/>-->
<Grid Margin="0,203,10,-713" Grid.Row="1" >
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="0*"/>
</Grid.ColumnDefinitions>
<ListBox HorizontalAlignment="Left" Name="listbox1" ItemsSource="{Binding}" VerticalAlignment="Top" Height="500" Width="0">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel>
<Grid Margin="10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="50">
</ColumnDefinition>
<ColumnDefinition Width="50">
</ColumnDefinition>
</Grid.ColumnDefinitions>
<TextBlock Text="{Binding Description}" Margin="=3" Grid.Column="0"></TextBlock>
<TextBlock Text="{Binding ExpenseHeaderId}" Margin="=3" Grid.Column="1"></TextBlock>
</Grid>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
</Grid>
</Grid>
</phone:PhoneApplicationPage>
以下是文件（Result.xaml.cs）后面的代碼：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using System.Xml.Linq;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System.IO;
using System.Net.NetworkInformation;
using System.Text;
using System.ComponentModel;
using System.Collections.ObjectModel;
using MEO.MODELS;
namespace MEO.Views
{
public partial class Result : PhoneApplicationPage
{
//public Guid rid = new Guid(NavigationContext.QueryString["id"]);
//public string rpswd = NavigationContext.QueryString["password"];
//public DateTime headerFromDate = DateTime.Today;
//public DateTime detaiFromDate = DateTime.Today;
ObservableCollection<Claims> oc = new ObservableCollection<Claims>();
public Result()
{
InitializeComponent();
Guid rid = new Guid("0525466131154515");
string rpswd = "hchdj455mjchdjkch7dc1njj";
DateTime headerFromDate = Convert.ToDateTime("555525545");
DateTime detaiFromDate = Convert.ToDateTime("38635");
LoginService.DXDataMobileSoapClient client = new LoginService.DXDataMobileSoapClient();
client.GetFullClaimLinesCompleted+=client_GetFullClaimLinesCompleted;
client.GetFullClaimLinesAsync(rid, rpswd, "", headerFromDate, detaiFromDate, rid);
}
private void client_GetFullClaimLinesCompleted(object sender, LoginService.GetFullClaimLinesCompletedEventArgs e)
{
try
{
if (e.Error == null)
{
XElement[] array = Enumerable.ToArray<XElement>(e.Result.ReturnedDataTable.Any1.Descendants("ClaimHeadersDT"));
if (Enumerable.Count<XElement>(array) > 0)
{
//ObservableCollection<Claims> oc = new ObservableCollection<Claims>();
for (int i = 0; i < Enumerable.Count<XElement>(array); i++)
{
oc.Add(new Claims()
{
Description = (string)array[i].Element("h_description"),
ExpenseHeaderId =(string)array[i].Element("h_expense_headerID"),
});
}
listbox1.ItemsSource = oc;
}
}
}
catch(Exception ex)
{
throw ex;
}
}
}
}
我的問題是我從Web服務（即從XML）獲取數據，並將數據添加到我的集合（即ObservableCollection oc）中。 但是我無法將oc數據綁定到列表框。 我在App.xaml遇到錯誤，如未處理的異常。 我的catch塊中未捕獲該錯誤。 但是， Listbox.Itemssource具有包含603個項目的數據。
我認為您遇到了這個問題，因為列表框使用“模型作為數據模板”，您從網絡服務器上獲取的是xml數據並轉為字符串，我之前做過類似的事情，並且還做了類似的事情……
private void client_GetFullClaimLinesCompleted(class.......)
{
oc.ItemsSource = e.Result;
}
如您所說，您將獲得603個結果，但它們無法在DataTemplate模型上識別
在WPF中的XAML中，將數據從XmlDataProvider綁定到ListBox失敗
[英]Binding data from XmlDataProvider to a ListBox fails in XAML in WPF
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