add-item-to-group-in-specific-index-.net-maui-listview

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 by using the KeySelector property and the Key value of each group. Since, 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 find which group the item belongs to by using PropertyInfoCollection, PropertyName and KeySelectorand after getting the desired group’s GroupResult value, insert the particular 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);

You can determine which group does the newly added item belongs to by using the KeySelectorproperty and Key value of the group by passing the underlying data into 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 the specific group at the specific index,

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

Take a moment to peruse the documentation to learn more about grouping and its related operations in the SfListView with code examples.

SyncfusionExamples/add-item-to-group-in-specific-index-.net-maui-listview

add-item-to-group-in-specific-index-.net-maui-listview