Unlike previous versions of OfficeWriter, v12 requires a license key to be directly added into the code of a project in order to take full advantage of .NET Core’s ability to target multiple operating systems.
The example below demonstrates how to add a license key to a project that uses ExcelWriter. Identical steps can also be taken for WordWriter and PowerPointWriter.
using Softartisans.OfficeWriter.ExcelWriter;
ExcelApplication xla = new ExcelApplication();
xla.licensekey = “your-license-key”;
This process for adding a license key is not unique to Excel Application objects and can also be used for all template objects as well.