Hi Brian Smith,
Based on my research, Report Viewer control is an ASP.NET Web Forms control (there’s a Windows Forms version as well) for your existing apps. (Developing new web apps on ASP.NET Core/MVC and other web frameworks? Know that your scenario is on our radar as
well). We could look forward to its release. You can pay attention to SQL
Server Reporting Services Team Blog for the newest feature. Currently, you could try the workaround provided by the AlanJuden.
In addition, you also could submit the requirement at https://connect.microsoft.com/SQLServer/. Your feedback is valuable
for us to improve our products and increase the level of service provided.
Thanks for your understanding and support.
Best Regards,
Zoe Zhi
MSDN Community Support
Please remember to click "Mark as Answer" the responses that resolved your issue, and to click "Unmark as Answer" if not. This can be beneficial to other community members reading this thread. If you have any compliments or complaints to
MSDN Support, feel free to contact MSDNFSF@microsoft.com.