WP7：將UIElements動態添加到LongListSelector項目

Question

我試圖以編程方式將UIElement s添加到LongListSelector項目。我創建模板頁眉，頁腳，項目等

現在我做這樣的事情（列表項模板）：

<DataTemplate x:Key="listItemTemplate"> 
    <ContentPresenter Content="{Binding ItemContent}"></ContentPresenter> 
</DataTemplate> 

模型裏面，我assisgn的ItemContent到一個網格，我添加了不同的UI元素。我真的不知道這是否是這樣做的，或者如果這甚至可能在LongListSelector上，但是當滾動列表時，我會得到一個「該參數不正確。」異常（起初，一切似乎沒問題，所有添加的元素看起來都很好）。我嘗試了不同的方法，但都沒有工作，我覺得我只是隨機嘗試解決方案而沒有一定的想法。有沒有人設法通過使用LongListSelector做到這一點（任何建議將不勝感激）？

調用堆棧：

LongListSelectorPOC.dll!LongListSelectorPOC.App.Application_UnhandledException(object sender, System.Windows.ApplicationUnhandledExceptionEventArgs e) Line 102 + 0x5 bytes C# System.Windows.dll!MS.Internal.Error.CallApplicationUEHandler(System.Exception e) + 0x30 bytes
System.Windows.dll!MS.Internal.Error.GetXresultForUserException(System.Exception ex) + 0x4d bytes
System.Windows.dll!MS.Internal.FrameworkCallbacks.ManagedPeerTreeUpdate(System.IntPtr oldParentElement, System.IntPtr parentElement, System.IntPtr childElement, byte bIsParentAlive, byte bKeepReferenceToParent, byte bCanCreateParent) + 0x6b bytes
[External Code] System.Windows.dll!MS.Internal.XcpImports.MeasureOverrideNative(System.IntPtr element, float inWidth, float inHeight, out float outWidth, out float outHeight)
System.Windows.dll!MS.Internal.XcpImports.FrameworkElement_MeasureOverride(System.Windows.FrameworkElement element, System.Windows.Size availableSize) + 0x26 bytes System.Windows.dll!System.Windows.FrameworkElement.MeasureOverride(System.Windows.Size availableSize) + 0x7 bytes
System.Windows.dll!System.Windows.FrameworkElement.MeasureOverride(System.IntPtr nativeTarget, double inWidth, double inHeight, out double outWidth, out double outHeight) + 0x43 bytes [External Code] System.Windows.dll!MS.Internal.XcpImports.Measure_WithDesiredSizeNative(System.IntPtr element, float inWidth, float inHeight, out float outWidth, out float outHeight)
System.Windows.dll!MS.Internal.XcpImports.UIElement_Measure_WithDesiredSize(System.Windows.UIElement element, System.Windows.Size availableSize) + 0x26 bytes
System.Windows.dll!System.Windows.UIElement.Measure_WithDesiredSize(System.Windows.Size availableSize) + 0x39 bytes System.Windows.dll!System.Windows.Controls.VirtualizingStackPanel.MeasureChild(System.Windows.UIElement child, System.Windows.Size layoutSlotSize) + 0x42 bytes System.Windows.dll!System.Windows.Controls.VirtualizingStackPanel.GeneratePreviousChild(int childIndex, System.Windows.Size layoutSlotSize) + 0x6f bytes
System.Windows.dll!System.Windows.Controls.VirtualizingStackPanel.GeneratePreviousItems(ref double logicalVisibleSpace, ref System.Windows.Size stackDesiredSize, System.Windows.Size layoutSlotSize, bool isHorizontal, bool adjustPositions) + 0x138 bytes
System.Windows.dll!System.Windows.Controls.VirtualizingStackPanel.MeasureOverride(System.Windows.Size constraint) + 0x4e1 bytes System.Windows.dll!System.Windows.FrameworkElement.MeasureOverride(System.IntPtr nativeTarget, double inWidth, double inHeight, out double outWidth, out double outHeight) + 0x43 bytes [External Code]

Answer 1

您應該使用DataTemplateSelector方法。

定義，例如，與場Grid，Border，StackPanel和枚舉的ItemType然後DataTemplateSelector類選擇模板使用該枚舉。

對於DataTemplateSelector，請看看下面的文章：http://www.windowsphonegeek.com/articles/Implementing-Windows-Phone-7-DataTemplateSelector-and-CustomDataTemplateSelector

Answer 2

使用ObservableCollection爲ItemContent。