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POWP7: Dynamically adding UIElements to a LongListSelector item
 

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  1. POWP7: Dynamically adding UIElements to a LongListSelector item
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    <p>I'm trying to add <code>UIElement</code>s to a <code>LongListSelector</code> item programmatically. I've created templates for the header, footer, items etc.</p> <p>Right now I'm doing something like this (the list item template):</p> <pre><code>&lt;DataTemplate x:Key="listItemTemplate"&gt; &lt;ContentPresenter Content="{Binding ItemContent}"&gt;&lt;/ContentPresenter&gt; &lt;/DataTemplate&gt; </code></pre> <p>Inside the model, I assisgn the ItemContent to a Grid, on which I'm adding different UI elements. I don't really know if this is the way to do it or if this is even possible on the LongListSelector but when scrolling the list I get a "The parameter is incorrect." exception (at first, everything seems ok and all the elements added look fine). I tried different approaches but none worked and I feel that I'm just randomly trying solutions without a certain idea. Has anyone managed to do this by using a LongListSelector (any suggestions would be greatly appreciated)?</p> <p>The call stack:</p> <p><code> 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<br> System.Windows.dll!MS.Internal.Error.GetXresultForUserException(System.Exception ex) + 0x4d bytes<br> System.Windows.dll!MS.Internal.FrameworkCallbacks.ManagedPeerTreeUpdate(System.IntPtr oldParentElement, System.IntPtr parentElement, System.IntPtr childElement, byte bIsParentAlive, byte bKeepReferenceToParent, byte bCanCreateParent) + 0x6b bytes<br> [External Code] System.Windows.dll!MS.Internal.XcpImports.MeasureOverrideNative(System.IntPtr element, float inWidth, float inHeight, out float outWidth, out float outHeight)<br> 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<br> 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)<br> System.Windows.dll!MS.Internal.XcpImports.UIElement_Measure_WithDesiredSize(System.Windows.UIElement element, System.Windows.Size availableSize) + 0x26 bytes<br> 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<br> 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<br> 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] </code></p>
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    1. USDave Clemmer
    1. USSpiri
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    1. COWhat is inside ItemContent? what is it's type? @Spiri
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      1. POWP7: Dynamically adding UIElements to a LongListSelector item
      1. USAlex Sorokoletov
    2. COI tried it with a Grid, a StackPanel and even with a Border with a Grid child - still got the exception when I added many items inside the LongListSelector
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      1. POWP7: Dynamically adding UIElements to a LongListSelector item
      1. USSpiri
    3. CONo @Spiri. You are binding ContentPresenter's Content to ItemContent. What is kept in this Property (ItemContent)?
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      1. POWP7: Dynamically adding UIElements to a LongListSelector item
      1. USAlex Sorokoletov
 

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