Update @inject to support keyed services #9286
Description
We added support for keyed services on the runtime as part of dotnet/aspnetcore#50561. We should consider what syntax we want to use when this is exposed through the @inject directive.
Some options are:
@inject Key Type PropertyName.@inject Type Key PropertyName.@inject Type(Key) PropertyName.
This would be for Blazor and Razor pages, since both added support for it.