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基於此示例，我在MSDN處創建了一個「非泛型自定義集合類，它從ObservableCollection派生，並將其限制爲特定類型。這用作ListView控件的ItemsSource屬性。這一切都很完美，xaml設計視圖顯示我加載到自定義集合類中的示例數據。xaml中未知類型錯誤，派生自ObservableCollection的類
當我嘗試構建項目時會出現問題;我得到這個錯誤：「錯誤1在XML命名空間'clr-namespace：Messaging_2._0;程序集=消息傳遞2.0.WindowsPhone，版本= 1.0.0.0，文化=中立，PublicKeyToken = null'未知類型'ThreadCollection'C：\ Users \韋斯利\源\回購\信使2.0 \消息2.0 \消息2.0 \消息2.0.WindowsPhone \ 2.0.WindowsPhone。MainPage.xaml中14 10短信
此錯誤從下面的XAML代碼的行<c:ThreadCollection x:Key="MainThreadCollection"/>起源。
<Page
x:Class="Messaging_2._0.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Messaging_2._0"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:c="clr-namespace:Messaging_2._0"
mc:Ignorable="d"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<Page.Resources>
<c:ThreadCollection x:Key="MainThreadCollection"/>
</Page.Resources>
<The code for the listview control is here, I haven't included it because it works as I expect.>
下面是C＃代碼由XAML後面引用：
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using System.Collections.ObjectModel;
// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238
namespace Messaging_2._0
{
/// <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 ThreadCollection MainThreadCollection = new ThreadCollection();
public MainPage()
{
this.InitializeComponent();
this.NavigationCacheMode = NavigationCacheMode.Required;
this.DataContext = this;
}
/// <summary>
/// Invoked when this page is about to be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached.
/// This parameter is typically used to configure the page.</param>
protected override void OnNavigatedTo(NavigationEventArgs e)
{
// TODO: Prepare page for display here.
// TODO: If your application contains multiple pages, ensure that you are
// handling the hardware Back button by registering for the
// Windows.Phone.UI.Input.HardwareButtons.BackPressed event.
// If you are using the NavigationHelper provided by some templates,
// this event is handled for you.
}
private void AddThread(object sender, RoutedEventArgs e)
{
MainThreadCollection.Add(new ThreadViewItem() { Name = "Tom Riddle", LatestMessage = "It worked!" });
}
}
public class ThreadCollection : ObservableCollection<ThreadViewItem>
{
public ThreadCollection()
: base()
{
Add(new ThreadViewItem() { Name = "Harry Potter", LatestMessage = "What's up?" });
}
}
public class ThreadViewItem
{
public String Name
{
get;
set;
}
public String LatestMessage
{
get;
set;
}
}
}
由於設計視圖正確預覽了哈利波特的信息，我認爲這個問題相對較小，我無法弄清楚它到底是什麼。