I have a grid and I want to sum the number of true values in a boolean column. Is there a way to create a custom aggregate function to achieve this?
If I am not misunderstanding the scenario, you can use the Count aggregate function to get the number of items of the Boolean column that values true and false. Check the Demo we have here https://demos.telerik.com/aspnet-core/grid/aggregates
I hope this helps.
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I am not entirely sure I understand the scenario you have. Is it possible that the approach demonstrated in this article would be useful for you?