The SfDataGrid’s DetailsViewExpanding event helps you to load the data or set ItemsSource of a DetailsView dynamically. You can use the DetailsViewSource property in GridDetailsViewExpandingEventArgs to set the itemsource for the DetailsViewDatagrid.
When the Data to be loaded in the DetailsView is downloaded from an external source or being read from a file, you may get a time delay. In such case, the Expanding event can be executed before the I/O processes get completes.
In this case, you can use Async and await to load the data with a time delay and hold the event from executing before the data gets loaded from an external source gets completed.
The await keyword ensures that no operations happen before the asynchronous method execution is completed.
The SfGrid_DetailsViewExpanding method runs synchronously until it reaches its first await expression. After await is reached, it is suspended until the awaited task is complete.
The declaration of GetItems() method adding the DetailsViewItemsSource asynchronously until the items are assigned to the underlying_List.
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