protected static IReadOnlyList<AbuseReportViewModel> GetReports()

public class AbuseController : AbuseBaseController
             {
                 const string cashKey = "__AbuseReports";
                 private readonly IMemoryCache _memory;
                 List<AbuseReportViewModel> _data;
            
                 public AbuseController(IMemoryCache memory,IFireWallConfig config )
                 {
                     _memory = memory;
                     if (!memory.TryGetValue<List<AbuseReportViewModel>>(cashKey, out var data))
                     {
            
                         data = new List<AbuseReportViewModel>( base.GetReports());
                         memory.Set<List<AbuseReportViewModel>>(cashKey, data,config.Cashing.UserSession);
                     }
                     _data = data;
            
                 }
            
                 public IActionResult Index()
                 {
                     return View(_data);
                 }
            
                 public IActionResult Download(string id)
                 {
                      //pass a string using index isp and index report avoiding the need to show file paths to users of the site
                     string[] values = id.Split('.');
                     if (values.Length == 2 && int.TryParse(values[0], out int isp) 
                         && isp>-1 
                         && int.TryParse(values[1], out int report) 
                         && report>-1 
                         && _data.Count > isp 
                         && _data[isp].Reports.Count > report 
                         && System.IO.File.Exists(_data[isp].Reports[report].Pdf) )
                     {
                         return File(System.IO.File.ReadAllBytes(_data[isp].Reports[report].Pdf),"application/pdf",System.IO.Path.GetFileName(_data[isp].Reports[report].Pdf));
                     }
            
                     return RedirectToAction(nameof(Index));
                 }
            
             }