Add item to new group

[Unknown]

Hello,

lets say i have a grouped and sorted SfListView, the data is grouped by date and sorted by time.

Now when i add a new item with an date that not existed previously in my bound ItemsSource a new group will be added with my item at the bottom of the SfListView instead of where it should be.

So if i have this:

• 24 Nov. 2021
  •   15:30
  •   16:30
• 26 Nov. 2021
  •   10:00

and i add a new item for the 25.11.2021 at 8:00

i get this:

• 24 Nov. 2021
  •   15:30
  •   16:30
• 26 Nov. 2021
  •   10:00
• 25 Nov. 2021
  •   08:00

What can i do to get list correctly sorted?

Regards,

   Kalle

[Lakshmi Natarajan]

Hi Kalle, 

 

Thank you for using Syncfusion support. 

 

We have checked the reported query “Add item to new group” from our side. We would like to let you know that you can achieve your requirement by using the GroupComparer to sort the groups based on custom logic. 

 

Please refer to our user guidance document regarding the same in the following link, 

UG link: https://help.syncfusion.com/xamarin/listview/grouping#custom-sorting-of-groups 

 

Please refer to the following code snippets to achieve your requirement, 

 

CustomGroupComparer 

public class CustomGroupComparer : IComparer<GroupResult> 

{ 

    public int Compare(GroupResult x, GroupResult y) 

    { 

        // Your compare logic here 

 

        return x.Key.ToString().CompareTo(y.Key.ToString()); 

    } 

} 

 

 

Set the CustomGroupComparer to the DataSource.GroupDescriptors. 

ListView.DataSource.GroupDescriptors.Add(new GroupDescriptor() 

{ 

    PropertyName = "ContactName", 

    KeySelector = (object obj1) => 

    { 

        var item = (obj1 as Contacts); 

        return item.ContactName[0].ToString(); 

    }, 

    Comparer = new CustomGroupComparer() 

}); 

 

 

You can also refer to our online documentation to sort the items with grouping from the following link, 

KB link: https://www.syncfusion.com/kb/8499/how-to-sort-the-items-by-datetime-property-along-with-grouping 

 

Please let us know if you need further assistance. 

 

Regards, 

Lakshmi Natarajan