How to set custom column width while exporting to PDF in WPF DataGrid?

public class SfDataGridToPdfConverterExt : SfDataGridToPdfConverter
{ 
        public override PdfDocument ExportToPdf(SfDataGrid sfgrid)
        {
            return base.ExportToPdf(sfgrid);
        }
 
        public override PdfDocument ExportToPdf(SfDataGrid sfgrid, ICollectionViewAdv view, PdfExportingOptions pdfExportingOptions)
        {
            return base.ExportToPdf(sfgrid, view, pdfExportingOptions);
        }
 
        public override PdfDocument ExportToPdf(SfDataGrid sfgrid, PdfExportingOptions pdfExportingOptions)
        {
            return base.ExportToPdf(sfgrid, pdfExportingOptions);
        }
 
        private int startColIndex = 0;
 
        protected override void SetColumnWidth(SfDataGrid sfgrid, PdfGrid pdfGrid, PdfExportingOptions pdfExportingOptions)
        {
            var gridColumns = pdfExportingOptions.Columns;
 
            var groupColumnDescriptionsCount = (int)pdfExportingOptions.GetType().GetProperty("GroupColumnDescriptionsCount", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).GetValue(pdfExportingOptions);
            
            int columnIndex = groupColumnDescriptionsCount > 0 ? groupColumnDescriptionsCount : startColIndex;
            //After grouping while export to pdf by setting the Export group option as false, need to skip indent column count for setting the columns actual width of PDf grid.
            columnIndex = pdfExportingOptions.ExportGroups ? columnIndex : 0;
            foreach (var column in gridColumns)
            {
                var gridColumn = sfgrid.Columns[column];
 
                var actualWidth = (float)(gridColumn.ActualWidth / 1.5);
 
                //set the width for paritucular column while pdf Exporting
                pdfGrid.Columns[columnIndex].Width = 200;
                columnIndex++;
            }
        }
}