我的自定义控件有时会出现以下异常:
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()}
发生这种情况的元素声明如下所示(当然,此处引用的事件处理程序已定义):
<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"/>
这是代码的一部分SectionClickableArea
:
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); }
}
我将此控件用于多边形按钮之类的东西。因此我从按钮继承。使用此控件数周以来,我遇到了类似的问题(E_AG_BAD_PROPERTY_VALUE
在另一个DependencyProperty
字符串类型上,根据给定的行和列等),但我完全不知道为什么。
今天早上另一个用户发生了相同控件的另一个异常(取自日志并翻译自德语):
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)
任何想法控件有什么问题,或者我可以做些什么来找到这些异常的来源?正如我所说,这些问题仅在控件实例化几十次时发生。