Conditional grouping if value exists

[Joe]

I have CollectionView sometimes I want it to be a flat format without grouping and other times I want it grouped.  Basically depending on how the input data.  I have figured out ways to have the group display nothing, but there is still a space for where the group header would be.

How could I go about this type of setup.  

Basically something like:

if string.IsNullOrEmpty(GroupName)
   //Don't group
else
    //group

[Didi]

Hi Joe,

The grouping is per property name, if you want to have a conditional grouping, then you need to implement a custom logic whether to add or clear the group descriptors if the property is null or empty, here is an example:

private void Button_Clicked(object sender, EventArgs e)
{
	if(this.collectionView.BindingContext as ViewModel is null)
	{
		return;
	}

	if (this.vm.Locations.Any(item => string.IsNullOrEmpty(item.Country)))
	{
		this.collectionView.GroupDescriptors.Clear();
		return;
	}

	this.collectionView.GroupDescriptors.Add(new DelegateGroupDescriptor
	{
		DisplayContent = "Country",
		KeyLookup = new CustomIKeyLookup()
	});
}

and the example code is from here: https://www.telerik.com/maui-ui/documentation/controls/collectionview/grouping/delegate-group-descriptor . It is up to you whether to use the delegate or property group descriptor of the CollectionView.

Regards,
Didi
Progress Telerik

[Joe]

Thank you!