Add custom font - Problem when exporting to PDF

Hi, I've been using the report tools for .net core and currently I'm trying to add a custom font (Arial) when the user export my reports as PDF. I'm using the following code in the reporting API for accomplishing this:

1. // Method will be called to initialize the report information to load the report with ReportHelper for processing.
2. public void OnInitReportOptions(ReportViewerOptions reportOption)
3. {
4. string basePath = _hostingEnvironment.WebRootPath;
5. 

6. // Here, we have loaded the sales-order-detail.rdl report from application the folder wwwroot\Resources. sales-order-detail.rdl should be there in wwwroot\Resources application folder.
7. FileStream reportStream = new FileStream(basePath + @"\reports\"
8. + reportOption.ReportModel.ReportPath, FileMode.Open, FileAccess.Read);
9. 

10. reportOption.ReportModel.Stream = reportStream;
11. 

12. IList customers = new List() { 
13. new Customer() { Name = "Name1", Age = 25},
14. new Customer() { Name = "Name2", Age = 22},
15. new Customer() { Name = "Name3", Age = 23}, 
16. new Customer() { Name = "Name4", Age = 26}
17. };
18. 

19. reportOption.ReportModel.DataSources.Add(new ReportDataSource { Name = "DSTCustomers", Value = customers });
20. 

21. string resourceName = "ReportTests.Resources.Arial.ttf";
22. 

23. if (reportOption.ReportModel.PDFOptions == null)
24. {
25. reportOption.ReportModel.PDFOptions = new Syncfusion.Reporting.Writer.PDFOptions();
26. }
27. 

28. if (reportOption.ReportModel.PDFOptions.Fonts == null)
29. {
30. reportOption.ReportModel.PDFOptions.Fonts =
31. 

32. new Dictionary(StringComparer.OrdinalIgnoreCase);
33. }
34. 

35. reportOption.ReportModel.PDFOptions.Fonts.Add("Arial",
36. Assembly.GetExecutingAssembly().GetManifestResourceStream(resourceName));
37. }

For tests, I wrapped the resource stream in a class that doesn't close the stream under any situation (something like "NonClosingStreamWrapper"). This way the problem doesn't seem to happen.

How can I fix this?

Regards, Wendell.