I am using a SfListView to group a collection and I would like to know if it is possible to Expand or Collapse a single group using a ViewModel. I would like to Expand the first group in my collection by default after the data is initially fetched from my database within the ViewModel command that executes this (if possible). Additionally, the DataSource that is binded to the SfListView will frequently be refreshed, so I would like to have a way to keep track of what groups are currently expanded and keep these groups open whenever the data is refreshed from my ViewModel. I'm sure that there are many people who would like to know if this can be done as well. The documentation doesn't mention anything about Expanding or Collapsing groups using MVVM.
SVSuja Venkatesan Syncfusion Team November 11, 2022 09:17 AM
The ExpandGroups and CollapseGroups methods in SfListView
allow you to programmatically expand and collapse the group. Accessing XAML
controls from ViewModel is not recommended because it violates the MVVM rule.
You can meet your requirements by using MessagingCenter in Xamarin.Forms.
Publish an expand message in which group you need to expand by
passing it as the third parameter in the Send method of MessagingCenter, as
shown in the code snippet below.