Custom code in a report allows to include new custom constants, variables, functions, or subroutines. As the VBCodeProvider is not available in .NET Core platform, report with custom codes requires additional settings to enable this feature. You can make use of the following solution using custom codes with Report Writer.
For RDL, built-in data source processing support is available only for SQL data source. For other datasources, you have to create a custom data extension for data processing.
.NET Core platform does not have a support to get font details from system environment to embed report fonts with PDF document. So, Report Writer will generate PDF documents only with TimesNewRoman font. You have to provide report font details as separate with PDF Options to get the PDF documents with expected font used in Report. Refer Add custom fonts to PDF document to resolve this problem.
Microsoft Excel has a limitation that you could not create a Excel document with more then 1,048,576 rows and 16,384 columns. So, as per limitation Report Writer does not support to create the Excel document from report above of 1,048,576 rows and 16,384 columns.
PNG and JPEG format images only supports in the ASP.NET Core Report Writer for PDF export. This limitation is from our Syncfusion.Pdf.Net.Core supports.