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01-10-2006
| #1 (permalink) |
| | Re: A Question on BackgroundWorker. Is there any solution for this problem? "Lei Jiang" <code@263.net.NO_SPAM> schrieb im Newsbeitrag news:%231ITs%23K7FHA.3048@TK2MSFTNGP10.phx.gbl... > > Thanks! Is there any other method that could solve my problem in my first > post? > > Thanks! > > > "Nick Kramer [MSFT]" <nkramer@ms.spam> дÈëÏûÏ¢ > news:OOKAS6K7FHA.2628@TK2MSFTNGP11.phx.gbl... >> To answer your original question, there's no way in WPF to great >> UIElements on one thread and send them to another. Freezable was >> specifically designed to be shared across the threads. Other subclasses >> of DispatcherObject are not, therefore they can't be shared across >> threads. From a platform point of view, being shared between threads and >> being created on one thread then handed off to another are nearly >> indistinguishable, so we don't distinguish. >> >> -Nick Kramer [MSFT] >> http://blogs.msdn.com/nickkramer >> >> --- >> This posting is provided "AS IS" with no warranties, and confers no >> rights. Use of included script samples are subject to the terms specified >> at http://www.microsoft.com/info/cpyright.htm >> >> >> "Lei Jiang" <code@263.net.NO_SPAM> wrote in message >> news:%23v8y8QB7FHA.1028@TK2MSFTNGP11.phx.gbl... >>> >>> As described in that thread, DispatcherObject.DetachFromDispatcher is >>> what needed in such situation, why this method is dropped? >>> >>> Thanks! >>> >>> "Lei Jiang" <code@263.net.NO_SPAM> дÈëÏûÏ¢ >>> news:etj8IOB7FHA.3136@TK2MSFTNGP09.phx.gbl... >>>> >>>> Thanks! I have read that thread, but it only works for Freezable. Other >>>> objects, such as Shapes, Canvas, cannot go through thread boundary. >>>> >>>> "Drew Marsh" <drub0y@hotmail.no.spamming.com> ???? >>>> news:b6983b4cc64cb8c7b9fd613d70c8@msnews.microsoft.com... >>>>> Lei Jiang wrote: >>>>> >>>>>> If I want to create new WPF objects in background thread and add them >>>>>> to main UI, how could I do it? For example, I have some data stored >>>>>> in >>>>>> database and want to load them in a background thread, then create >>>>>> WPF >>>>>> objects and add them into the main UI. If I do this, an >>>>>> ArgumentException will be thrown : "This API was accessed with >>>>>> arguments from the wrong context.". This exception is thrown as >>>>>> expected since this situation is forbidden and is clearly stated in >>>>>> document. The question is : how can I do such tasks? The data should >>>>>> be loaded in a background thread and only after the data are loaded >>>>>> could the WPF objects be created, and the UI thread is the main >>>>>> thread. How can I create the UI without long UI delay? >>>>> >>>>> While there used to be a way to do this, it no longer exists. Some of >>>>> the details in this[1] thread might be able to help you. >>>>> >>>>> HTH, >>>>> Drew >>>>> >>>>> [1] >>>>> http://msdn.microsoft.com/newsgroups...f-899706aae7bc >>>>> ___________________________________ >>>>> Drew Marsh >>>>> Chief Software Architect >>>>> Mimeo.com, Inc. - http://www.mimeo.com >>>>> Weblog - http://blog.hackedbrain.com/ >>>>> >>>>> >>>> >>>> >>> >>> >> >> > > |
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