How to render the drillthrough report in ASP.NET Core application

public partial class HomeController : Controller, IReportController
    {
        private IMemoryCache _cache;
        private IHostingEnvironment _hostingEnvironment;
 
        public HomeController(IMemoryCache memoryCache, IHostingEnvironment hostingEnvironment)
        {
            _cache = memoryCache;
            _hostingEnvironment = hostingEnvironment;
        }
 
        [HttpPost]
        public object PostReportAction([FromBody] Dictionary<string, object> jsonResult)
        {
            return ReportHelper.ProcessReport(jsonResult, this, this._cache);
        }
 
        [ActionName("GetResource")]
        [AcceptVerbs("GET")]
        public object GetResource(ReportResource resource)
        {
            return ReportHelper.GetResource(resource, this, _cache);
        }
 
        [HttpPost]
        public object PostFormReportAction()
        {
            return ReportHelper.ProcessReport(null, this, this._cache);
        }
 
        public void OnInitReportOptions(ReportViewerOptions reportOption)
        {
            reportOption.ReportModel.ReportServerUrl = "http://<No server>";
            reportOption.ReportModel.ReportServerCredential = new System.Net.NetworkCredential("<no user>", "<no password>");
 
            Reportserver reportserver = new Reportserver(_hostingEnvironment);
            reportOption.ReportModel.ReportingServer = reportserver;
        }
 
        public void OnReportLoaded(ReportViewerOptions reportOption)
        {
           
        }
    }
 
    public class Reportserver : ReportingServer
    {
        private IHostingEnvironment _hostingEnvironment;
 
        public Reportserver(IHostingEnvironment hostingEnvironment)
        {
            _hostingEnvironment = hostingEnvironment;
        }
 
        public override Stream GetReport()
        {
            string basePath = _hostingEnvironment.WebRootPath + "/ReportData/";
            FileStream inputStream = new FileStream(basePath+this.ReportPath+".rdl", FileMode.Open, FileAccess.Read);
            return inputStream;
        }
    }