How to add an item at a specific index in grouped .NET MAUI ListView (SfListView) ?

In .NET MAUI ListView (SfListView), you can add an item at a specific index in a specific group using the KeySelector property and the Key value of each group. Each group is identified by its Key, which holds the underlying data related to the group. When a new item is added at runtime, you need to determine which group the item belongs to by using PropertyInfoCollection, PropertyName, and KeySelector. After identifying the desired group’s GroupResult value, insert the item into a specified index.

C#

To add new data to the underlying collection in the ViewModel class,

var contact = new Contact();
contact.ContactName = "Adam";
contact.ContactNumber = "783-457-567";
contact.ContactImage ="image"+r.Next(0, 28)+".png";
//Adding data into underlying collection      
ViewModel.ContactItems.Add(contact);

To determine which group the newly added item belongs to using the KeySelector property and the Key value of the group, pass the underlying data to the parameter in the GetGroupResult method.

internal void GetGroupResult(object ItemData)
{
      var descriptor = listView.DataSource.GroupDescriptors[0];
      object key;
 
      if (descriptor.KeySelector == null)
      {
         var propertyInfoCollection = new PropertyInfoCollection(ItemData.GetType());
         key = propertyInfoCollection.GetValue(ItemData, descriptor.PropertyName);
      }
      else
         key = descriptor.KeySelector(ItemData);
 
    itemGroup = this.listView.DataSource.Groups.FirstOrDefault(x => x.Key == key);         
        descriptor = null;
        key = null;
}

To add the data into a specific group at a specific index,

internal void InsertItemInGroup(List<object> items, object Item, int InsertAt)  
{
     items.Remove(Item);
     items.Insert(InsertAt, Item);
}

Output

 Download the complete sample on GitHub.

Conclusion

I hope you enjoyed learning how to add an item at a specific index in a grouped .NET MAUI ListView (SfListView).

You can refer to our .NET MAUI ListView feature tour page to learn about its other groundbreaking feature representations and documentation, and how to quickly get started with configuration specifications. You can also explore our .NET MAUI ListView example to understand how to create and manipulate data.

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