我有时得到我的自定义控件以下异常:XamlParseException:自定义控件中的属性缺失,但已定义!
XamlParseException occurred
Unknown attribute Points in element SectionClickableArea [Line: 10 Position 16]
堆栈跟踪:
{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()}
元素声明,其中发生这种情况看起来像这样(的这里引用的事件处理程序当然是定义的):
<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"/>
这是SectionClickableArea
代码的一部分:
public partial class SectionClickableArea : Button {
public static readonly DependencyProperty PointsProperty
= DependencyProperty.Register("Points", typeof(PointCollection), typeof(SectionClickableArea),
new PropertyMetadata((s, e) => {
SectionClickableArea area = (SectionClickableArea) s;
area.areaInfo.Points = (PointCollection) e.NewValue;
area.UpdateLabelPosition();
}));
public PointCollection Points {
get { return (PointCollection) GetValue(PointsProperty); }
set { SetValue(PointsProperty, value); }
}
我使用这个控制类似的多边形形状的按钮。所以我从按钮继承。我有类似的问题(E_AG_BAD_PROPERTY_VALUE
在另一个DependencyProperty
类型的字符串,根据给定的行和列等)与这种控制数周,但我绝对不知道为什么。
另一个例外对于同一控制今天上午发生了其他用户(从日志截断并从德国翻译):
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()
内部异常:
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)
任何想法是什么控制权是否错误,或者我能做些什么来找到这些例外的来源?正如我所说的,这些问题只发生在控制实例化的每几十次。
由于这是一个受欢迎的问题,我想跟进:在这种情况下,我们从未发现问题。自从我开始工作已经有一段时间了,但我认为一个团队成员通过在循环中调用XAML根节点的对象的构造函数来“解决”它,直到没有抛出异常为止。 – 2010-09-19 11:22:34