Occasionally it happens to me too that some project is not compiled or the assemblies in the bin are not updated. Try to clean the solution, delete bin and obj directories. Rebuild and make sure the assemblies in the executable project are updated.
Additionally, make sure that you don't have other ReportControllerBase implementations that may conflict with this one.
I see this issue still. I tried all the approach listed above but no luck.
answered on 02 Jan 2018, 11:55 AM
Check if ReportServiceConfiguration.ReportResolver property is set to an instance of the custom report resolver - example is provided in step 2 of How To: Implement a Custom Report Resolver help article.
In case the resolver is still not called, share the code of ReportsController and custom resolver so we can review it. You can also attach a sample project that reproduces the issue in a support ticket so we can test it locally.
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Thanks Katia. I figured it out. I was nothing to do with resolver. I was using ASP.NET core project example which did not have App.Config file but web.config. I added App.config which solved all the issues.