Coded UI test Single Thread Apartment (STA) error occurred while executing [ClassCleanup] method -


why sta error while class performing clean-up method in coded ui test seems concrete test methods works fine. code looks ff:

    [codeduitest]     public class concretecuit : testbase      {         [classinitialize]         public static void initialize(testcontext context)         {           //do init         }         [classcleanup]         public static void cleanup()         {           //do clean-up - sta error!!!         }         [testmethod]         public void concrete1crudtest()         {           //do ui test         }         [testmethod]         public void concrete2crudtest()         {           //do ui test         }     }

and got following error below:

class cleanup method samplecuit.cleanup failed. error message:microsoft.visualstudio.testtools.uitest.extension.uitestexception: coded ui test running in single thread apartment (sta) mode of com.  in mode, playback calls should happen testmethod thread , uitestcontrol should not shared across testmethods..  stack trace:    @ microsoft.visualstudio.testtools.uitest.playback.screenelement.throwexceptionifcrossthreadaccess(iscreenelement uielement)    @ microsoft.visualstudio.testtools.uitest.playback.screenelement.findallscreenelement(string queryid, int32 depth, boolean singlequeryid, boolean throwexception)    @ microsoft.visualstudio.testtools.uitest.playback.screenelement.findscreenelement(string queryid, int32 depth)    @ microsoft.visualstudio.testtools.uitesting.uitestcontrol.findfirstdescendant(string queryid, int32 maxdepth, int32& timeleft)    @ microsoft.visualstudio.testtools.uitesting.searchhelper.getelement(boolean usecache, isearchargument searcharg)    @ microsoft.visualstudio.testtools.uitesting.searchhelper.search(isearchargument searcharg)    @ microsoft.visualstudio.testtools.uitesting.uitestcontrol.findinternal()    @ microsoft.visualstudio.testtools.uitesting.uitestcontrol.findcontrolifnecessary()    @ microsoft.visualstudio.testtools.uitesting.uitestcontrol.click(mousebuttons button, modifierkeys modifierkeys, point relativecoordinates)    @ microsoft.visualstudio.testtools.uitesting.mouse.clickimplementation(uitestcontrol control, mousebuttons button, modifierkeys modifierkeys, point relativecoordinate)    @ microsoft.visualstudio.testtools.uitesting.mouse.clickimplementationwrapper(uitestcontrol control, mousebuttons button, modifierkeys modifierkeys, point relativecoordinate)    @ microsoft.visualstudio.testtools.uitesting.mouse.click(uitestcontrol control)

the top line of stack trace states problem: "... all playback calls should happen testmethod thread". later lines of stack trace show call of mouse.click cleanup routine.

do not call ui actions classcleanup method.


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