public partial class MainPage : ContentPage
{
    ViewModel vm;
    public MainPage()
    {
        InitializeComponent();
        this.vm = new ViewModel();
        this.BindingContext = this.vm;
       this.datagrid.DataBindingComplete += Datagrid_DataBindingComplete;
    }

    private void Datagrid_DataBindingComplete(object? sender, DataBindingCompleteEventArgs e)
    {
        var fType = e.GetType().GetProperty("ChangeFlags", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Public);
        if (fType != null)
        {
            var fValue = fType.GetValue(e);
            if (fValue != null)
            {
                Type enumType = fType.PropertyType;
                var pChange = Enum.Parse(enumType, "PropertyChanged");
                if (fValue.Equals(pChange))
                {
                   this.datagrid.RowBackgroundStyleSelector = new MyRowBackgroundStyleSelector()
                   {
                       RowBackgroundStyle = this.Resources["RowBackgroundStyle"] as Style,
                       AlternateRowBackgroundStyle = this.Resources["AlternateRowBackgroundStyle"] as Style,
                       RowDetailsBackgroundStyle = this.Resources["RowDetailsBackgroundStyle"] as Style,
                       AlternateRowDetailsBackgroundStyle = this.Resources["AlternateRowDetailsBackgroundStyle"] as Style,
                   };   
                }
            }
        }
    }
}