问题
Getting an error in IE console while loading Blazor application after updating Visual Studio 2019 Preview 1 to Preview 2
Error: Microsoft.JSInterop.JSException: iconRef is not defined ReferenceError: iconRef is not defined
回答1:
When deleting all the browsing data like cookies, cache extra the issue is resolved.
来源：https://stackoverflow.com/questions/57609202/error-after-updating-visual-studio-2019-preview