How know WPF DataGrid ItemsSource bind finish

When the DataGrid displays the data, the data loaded is finished. If the date loads to slow, then you need to figure out whether it takes you time to fetch data from the database or to render the DataGrid. If it's the latter, you can set the DataGrid property EnableColumnVirtualization and EnableRowVirtualization to make it a virtual loading to improve performance.

I just want to know how to trigger events when displaying data?

you say, the data loaded is finished. How to capture this state ?

WPF has no event to get the Itemsource binding completed status in official document. Could you give a description of your "trigger events when displaying data"?

I'm looking for a trigger now.