Basically, you can follow the steps given in How To: Use HTML5 Report Viewer in an ASP.NET Core 3+ application article. Note that due to some changes between .NET CORE 3 and .NET CORE 3.1, there is a little difference in step2 in Setting up the ConfigurationService in the Startup.cs file. The code has to look as follows:
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
this.services.AddTransient(ctx => new Controllers.ReportsController(new ConfigurationService(env)));
In the attached file you can find a sample project. Before starting the application you might need to run the Upgrade Wizard.
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