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POXamlParseException: Attribute in custom control missing, but it's defined!
 

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    <p>I <em>sometimes</em> get the following exception for a custom control of mine:</p> <p><code>XamlParseException occurred</code> <code>Unknown attribute Points in element SectionClickableArea [Line: 10 Position 16]</code></p> <p>The stack trace:</p> <pre><code>{System.Windows.Markup.XamlParseException: Unknown attribute Points on element SectionClickableArea. [Line: 10 Position: 16] at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator) at SomeMainDialog.InitializeComponent() at SomeMainDialog..ctor()} </code></pre> <p>The element declaration where this happens looks like this (the <strong>event handler</strong> referenced here is defined, of course):</p> <pre><code>&lt;l:SectionClickableArea x:Name="SomeButton" Points="528,350, 508,265, 520,195, 515,190, 517,165, 530,120, 555,75, 570,61, 580,60, 600,66, 615,80, 617,335, 588,395, 550,385, 540,390, 525,393, 520,385" Click="SomeButton_Click"/&gt; </code></pre> <p>This is part of the code of <code>SectionClickableArea</code>:</p> <pre><code>public partial class SectionClickableArea : Button { public static readonly DependencyProperty PointsProperty = DependencyProperty.Register("Points", typeof(PointCollection), typeof(SectionClickableArea), new PropertyMetadata((s, e) =&gt; { SectionClickableArea area = (SectionClickableArea) s; area.areaInfo.Points = (PointCollection) e.NewValue; area.UpdateLabelPosition(); })); public PointCollection Points { get { return (PointCollection) GetValue(PointsProperty); } set { SetValue(PointsProperty, value); } } </code></pre> <p>I use this control for something like a polygon-shaped button. Therefore I'm inheriting from button. I've had similar problems (<code>E_AG_BAD_PROPERTY_VALUE</code> on another <code>DependencyProperty</code> of type string, according to the line and column given, etc) with this control for weeks, but I have absolutely no idea why.</p> <hr> <p>Another exception for the same control occurred this morning for another user (taken from a log and translated from German):</p> <pre><code>Type: System.InvalidCastException Message: The object of type System.Windows.Controls.ContentControl could not be converted to type [...]SectionClickableArea. at SomeOtherMainDialog.InitializeComponent() at SomeOtherMainDialog..ctor() </code></pre> <p>Inner exception:</p> <pre><code>Type: System.Exception Message: An HRESULT E_FAIL error was returned when calling COM component at MS.Internal.XcpImports.CheckHResult(UInt32 hr) at MS.Internal.XcpImports.SetValue(INativeCoreTypeWrapper obj, DependencyProperty property, DependencyObject doh) at MS.Internal.XcpImports.SetValue(INativeCoreTypeWrapper doh, DependencyProperty property, Object obj) at System.Windows.DependencyObject.SetObjectValueToCore(DependencyProperty dp, Object value) at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value, Boolean allowReadOnlySet, Boolean isSetByStyle, Boolean isSetByBuiltInStyle) at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value) at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value) at System.Windows.Controls.Control.set_DefaultStyleKey(Object value) at System.Windows.Controls.ContentControl..ctor() at System.Windows.CoreTypes.GetCoreWrapper(Int32 typeId) at MS.Internal.ManagedPeerTable.EnsureManagedPeer(IntPtr unmanagedPointer, Int32 typeIndex, Type type, Boolean preserveManagedObjectReference) at MS.Internal.ManagedPeerTable.EnsureManagedPeer(IntPtr unmanagedPointer, Int32 typeIndex, Type type) at MS.Internal.ManagedPeerTable.GetManagedPeer(IntPtr nativeObject) at MS.Internal.FrameworkCallbacks.SetPropertyAttribute(IntPtr nativeTarget, String attrName, String attrValue, String attachedDPOwnerNamespace, String attachedDPOwnerAssembly) </code></pre> <p>Any ideas what's wrong with the control, or what I can do to find the source of these exceptions? As I said, these problem occur only every few dozen times the control is instantiated.</p>
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    1. COSince this is now a popular question, I wanted to follow up: In this case, we never found the problem. It's been quite a while since I worked on this, but I think a team member "solved" it by calling the constructor for the object for the XAML Root Node in a loop, repeating until no exception is thrown.
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