Hi,
I tested nested properties in data grid by following this doc https://docs.telerik.com/devtools/maui/controls/datagrid/columns/nested-properties. But got an error at the footer of City Column when I counting the cities by PropertyAggregateDescriptor for this column
So I am wondering is aggregate supported for nested properties?
Jamison
1 Answer, 1 is accepted
Hi Jia,
Thank you for the provided information.
I have tested the case and yes, the aggregates do not support nested property. I will need some additional time to discuss the case with the development team, and will send a reply in a day or two.
For now as a solution you can manually define the value for the footer text for the concrete column:
var column = this.grid.Columns[2];
var data = this.vm.Persons;
if (data != null)
{
var collection = new ObservableCollection<Person>();
foreach (var item in data)
{
if (item.Address.City != null)
{
collection.Add(item);
}
}
column.FooterText= "Total count: " + collection.Count.ToString();
}I have attached the solution to this ticket.
Thank you for the understanding.
Regards,
Didi
Progress Telerik
Rank 1
Iron
Hi Jia,
The feature request is logged here: https://feedback.telerik.com/maui/1627861-datagrid-support-for-nested-properties-in-the-propertyaggregate-descriptor Cast your vote and follow the item to track its progress.
FooterText approach displays the total count for the items which value is not null. You can remove the null check if the scenario you want to achieve is different and also want to count the null values.
You can use the Delegate aggregate descriptor for columns with nested properties. I have attached the files used. Again there is an approach with null check and without null check. based on your scenario. You may need to extend the logic to match the exact case you have.