How to sort your binded collection of ViewModel in WPF DataGrid?

By default, In WPF DataGrid (SfDataGrid), will not sort the underlying collection when displayed in the grid. When you sort a column, internally datagrid will maintain the underlying collection and does a sort that reflects only in view. So, if you want to sort the underlying collection of view model, you can apply sorting by using SortColumnsChanged event.

this.datagrid.SortColumnsChanged += datagrid_SortColumnsChanged;

private void datagrid_SortColumnsChanged(object sender, GridSortColumnsChangedEventArgs e)
{
    var viewModel = this.DataContext as ViewModel;
 
    // view model collection taken
    IEnumerable<BusinessObjects> OrderedSource = viewModel.GDCSource;
 
    foreach (var sortColumn in datagrid.View.SortDescriptions)
    {
        // get property name of current sort column
        var columnName = sortColumn.PropertyName;
 
        if (sortColumn.Direction == ListSortDirection.Ascending)
        // make a sorting by ascending order
            OrderedSource = OrderedSource.OrderBy(b => OrderSource(b, columnName));
        else
        // make a sorting by descending order
            OrderedSource = OrderedSource.OrderByDescending(b => OrderSource(b, columnName));
    }
}
 
private object OrderSource(BusinessObjects b, string name)
{
    var propInfo = b.GetType().GetRuntimeProperty(name);
    if (propInfo != null)
        // get the current sort column value
        return propInfo.GetValue(b);
    return null;
}

private object OrderSource(OrderInfo b, string name)
{
    var propInfo = b.GetType().GetProperty(name);
    if (propInfo != null)
        // get the current sort column value
        return propInfo.GetValue(b, null);
    return null;
}

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WPF

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UWP