Telerik Reporting relies heavily on the full .NET Framework and some of the APIs there are not available in .NET Core.
At the moment, the only option to target .NET Core as the framework of your ASP.NET Core 2.1 application and use Telerik Reporting is the following:
1. Add the HTML5 Report Viewer to the ASP.NET Core 2.1 (.NET Core) application.
2. Add the Reporting REST service which will feed the viewer with report documents to another application which targets the full .NET Framework. Note that ASP.NET Core 2.1 can also target the full .NET Framework.
This is the same scenario which we use in the Angular Report Viewer. The HTML5 viewer displays the report documents in the Angular application but the report documents are actually rendered by a remote REST service which runs under the full .NET Framework.
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