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Editorial Team
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Asked: 2026-06-12T07:32:01+00:00

I have a Form with a TextBox in it. Every time the text changes

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I have a Form with a TextBox in it. Every time the text changes i use the TextChanged Event to create a PDF-file and load it to an AxAcroPDF-Object in the same Form. This works fine, but then the TextBox loses focus and for some reason the textBox.Focus() after loading the file doesn’t work.

Has anyone ideas how I can arrange that you can go on typing while refreshing the PDF?

EDIT:

i had another idea, i made a separate thread where i update the PDF and in the TextChanged-event i only set a flag. But now im getting a strange error

Unable to cast COM object of type 'System.__ComObject' to interface type 'AcroPDFLib.IAcroAXDocShim'.
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1 Answer

  1. Editorial Team

    Im so ashamed of myself, i found a really, really dirty hack, but it works…
    I did the following:

    When i write a text in the MessageBox i rewrite my PDF in the TextChange-Event. In the same method i store the Control that has focus (when calling the LoadFile on the PDF-Object this Control still loses focus). And now the dirty work comes: I implemented a Thread that constantly sets focus to the Control stored in the variable. In the Leave-Event of the TextBox i reset the variable so other controls wont be blocked.

    Its a really dirty hack i know, but now i can instantly “edit” a pdf with my own form, which is a nice eyecandy 😉

    Thanks for all the help!

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