Steps to upgrade your project to .NET Standard library
If you have previously used the Highcharts wrapper for .NET, some small adjustments need to be made to your code when upgrading to the .NET Standard version of Highcharts .NET, which uses Json.NET instead of JavaScriptSerializer.
Here are the steps required to upgrade your projects.
1. Uninstall .NET Framework wrapper from the your old project
2. Add Newtonsoft.Json v12 package from NuGet
3. Download library from NuGet. Choose Highsoft.Highcharts or Highsoft.Highstock package.
4. Add using directive to the view file
5. Remove the call to the GetHighcharts method
6. Create a Highcharts object with the following options
7. Assign the ID of the div render target using chartOptions.ID