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Bug Report T944899
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TdxCustomGalleryControl descendants - The "Invalid typecast" error occurs on creating a control's handle after removing a gallery item when this control still has no handle

created 4 years ago

Hello,
i've found a little bug in the latest DX version. It starts to appears in our application in version 2020-I. In the previous version (2019-II) the exception didn't appear.

I've made a sample project, where you can simulate it.

Run the sample project, click on the application button, so the backstage view appears. Then close the backstage view and click on the application button again. For this time the exception is raised.

WorkAround:

  1. The backstage view has to be placed on separate form (it relates with creating new handle when backstage view appears).
  2. On CloseUp event its items has to be cleared.
  3. It somehow relates with TdxGalleryControlViewInfo.ItemViewInfo items. In the TdxGalleryControlViewInfo.CalculateMaxItemTextAreaSizeLimitedByRowCount there are ViewInfoItems still linked to the original (cleared) group items that have already been destroyed.

Regards, Jaroslav

Show previous comments (1)
DevExpress Support Team 4 years ago

    Hello Jaroslav,

    Would you mind if we publish this ticket so that other customers could find this thread? We can protect the privacy of your data by removing your attachment.
    Just let us know if it must be removed.

    E E
    Enzone86 4 years ago

      Hello Mikhail,
      there's nothing that has to be removed. Feel free to publish this ticket.

      J

      DevExpress Support Team 4 years ago

        Thanks. Published.

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        Answers approved by DevExpress Support

        created 4 years ago

        We have addressed the issue described in this ticket and will include a fix in our next maintenance update. To apply this solution before official release, request a hotfix by clicking the appropriate version link.

        Note: Hotfixes may be unavailable for betas/updates set for release within a week.

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