Threading errors with Application.LoadComponent (key already exists)

Posted by Kellls on Stack Overflow See other posts from Stack Overflow or by Kellls
Published on 2010-03-17T16:03:03Z Indexed on 2010/03/17 16:11 UTC
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multithreading

MSDN says that public static members of System.Windows.Application are thread safe. But when I try to run my app with multiple threads I get the following exception:

ArgumentException: An entry with the same key already exists.

   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.SortedList`2.Add(TKey key, TValue value)
   at System.IO.Packaging.Package.AddIfNoPrefixCollisionDetected(ValidatedPartUri partUri,
        PackagePart part)
   at System.IO.Packaging.Package.GetPartHelper(Uri partUri)
   at System.IO.Packaging.Package.GetPart(Uri partUri)
   at System.Windows.Application.GetResourceOrContentPart(Uri uri)
   at System.Windows.Application.LoadComponent(Uri resourceLocator, Boolean 
bSkipJournaledProperties)
       at System.Windows.Application.LoadComponent(Uri resourceLocator)

The application works fine on a single thread and even on two or three. When I get up past 5 then I get the error every time. Am I doing something wrong? What can I do to fix this?

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