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POThe calling thread cannot access this object because a different thread owns it
 

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    <p>I am using a third party tool in which I get an InvalidOperationException (actually, in the end this occurs in PresentationFramework.dll):</p> <blockquote> <p>The calling thread cannot access this object because a different thread owns it.</p> </blockquote> <p>I tried any kind of variations using Invoke, including BeginInvoke, but nothing changes.</p> <blockquote> <p>Session session = new ThirdPartyTool.Session();<br> Application.Current.Dispatcher.Invoke(DispatcherPriority.Normal, (Action)(() => session.Open(view)));</p> </blockquote> <p>When using Google I only find "solutions" that suggest to use Invoke. Well, I do use Invoke.<br> Other questions and their respective answer here on stackoverflow didn't help either. </p> <p>What can I still do in order to track down the actual cause?</p> <hr> <p>Edit: I had another look into the thread window and the full call stack is in the main thread. AFAIK, this indicates the Invoke is superfluous.</p> <hr> <p>Edit2:<br> The error isn't raised directly on calling open. The ThirdPartyTool initializes a list box and when measuring this list box the error occurs in the presentation framework:</p> <p><img src="https://i.stack.imgur.com/p53uT.png" alt="enter image description here"></p> <p>The actual exception is wrapped into an XamlParseException. The full exception detail:</p> <pre><code>System.Windows.Markup.XamlParseException occurred HResult=-2146233087 Message=The calling thread cannot access this object because a different thread owns it. Source=PresentationFramework LineNumber=0 LinePosition=0 StackTrace: at System.Windows.FrameworkTemplate.LoadTemplateXaml(XamlReader templateReader, XamlObjectWriter currentWriter) InnerException: System.InvalidOperationException HResult=-2146233079 Message=The calling thread cannot access this object because a different thread owns it. Source=WindowsBase StackTrace: at System.Windows.Threading.Dispatcher.VerifyAccess() at System.Windows.Freezable.get_IsFrozen() at System.Windows.Controls.Image.UpdateBaseUri(DependencyObject d, ImageSource source) at System.Windows.Controls.Image.OnSourceChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e) at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e) at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args) at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry&amp; newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType) at System.Windows.FrameworkTemplate.ReceivePropertySet(Object targetObject, XamlMember member, Object value, DependencyObject templatedParent) at System.Windows.FrameworkTemplate.&lt;&gt;c__DisplayClass6.&lt;LoadOptimizedTemplateContent&gt;b__4(Object sender, XamlSetValueEventArgs setArgs) at System.Xaml.XamlObjectWriter.OnSetValue(Object eventSender, XamlMember member, Object value) at System.Xaml.XamlObjectWriter.Logic_ApplyPropertyValue(ObjectWriterContext ctx, XamlMember prop, Object value, Boolean onParent) at System.Xaml.XamlObjectWriter.Logic_DoAssignmentToParentProperty(ObjectWriterContext ctx) at System.Xaml.XamlObjectWriter.Logic_AssignProvidedValue(ObjectWriterContext ctx) at System.Xaml.XamlObjectWriter.WriteEndObject() at System.Xaml.XamlWriter.WriteNode(XamlReader reader) at System.Windows.FrameworkTemplate.LoadTemplateXaml(XamlReader templateReader, XamlObjectWriter currentWriter) InnerException: null </code></pre>
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    1. COIs your code running in a background thread already?
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    2. COHave you asked the ThirdPartyTool support?
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    3. CO@JeffRSon Not yet because I haven't been able to create a simple project which reproduces this error. In hope that someone of the broad audience here on SO has some good ideas, this is my first port of call.
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