问题
I am printing a details subreport that gets printed let's say 5 times on the overall report, for 5 query results. I compute some stuff for it with my code, and so I use BeforePrint event on an XRTable widget that I have in that subreport. So far so good.
What I don't like is that when the BeforePrint executes for that table for the first time and I change its cells' text to something, that this renders on all subsequent instances of this report and table being printed. Now, obviously, since BeforePrint gets called again, I get the opportunity to reset the text to what it should be. So this is not a show stopper.
Yet, this somehow fills wrong, and an invitation to bugs. Is there a way for me to explicitly access "the instance of the table/other widget being printed" rather than "the widget in general, with changes being rendered in all instances that it prints"?
回答1:
Indeed, you are right. If the formatting should be based on the earlier created data or summary, formatting rules won't work. A possible solution to this problem is to implement a special approach when a developer manually browses all printing system bricks and changes their content manually. You will find some examples on how this can be done at:
Implementing Page totals
subtotal on page bottom and on next page on top
来源：https://stackoverflow.com/questions/5651109/does-devexpress-xtrareports-have-an-easily-accessible-notion-of-current-detail