6

我正在尝试查找仅在发布模式下发生的问题，并且很可能是由某些属性的无效混淆引起的。我知道在初始化特定控件时会发生这种情况，但是这个控件很大。我花了一天时间浏览所有 XAML 和绑定，但仍然看不到导致此异常的原因。

有什么方法可以获取更多信息。要知道是什么导致了这个异常？

Exception : System.NullReferenceException
Message   : Object reference not set to an instance of an object.
Source    : PresentationFramework
Help      : 
Stack     :
   at System.Windows.Markup.WpfXamlLoader.TransformNodes(XamlReader xamlReader, XamlObjectWriter xamlWriter, Boolean onlyLoadOneNode, Boolean skipJournaledProperties, Boolean shouldPassLineNumberInfo, IXamlLineInfo xamlLineInfo, IXamlLineInfoConsumer xamlLineInfoConsumer, XamlContextStack`1 stack, IStyleConnector styleConnector)
   at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
   at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
   at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
   at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
   at MyClass.InitializeComponent()
4

2 回答 2

6

I don't know a way to get a more detailed exception message, but it might at least be useful to other people to know possible causes. I've just tracked a NullReferenceException in WpfXamlLoader.TransformNodes down to a DependencyProperty which was registered with DependencyProperty.Register(string, Type, Type). Changing

public static readonly DependencyProperty FooProperty = DependencyProperty.Register(
        nameof(Foo), typeof(object), typeof(Bar));

to

public static readonly DependencyProperty FooProperty = DependencyProperty.Register(
        nameof(Foo), typeof(object), typeof(Bar), new FrameworkPropertyMetadata(null));

fixed the problem.

于 2016-09-21T11:10:19.027 回答
2

似乎无法获得更详细的异常消息。将有问题的 XAML 分成更小的部分是可行的方法。

于 2012-08-02T02:55:43.290 回答