"Empty" errors in MVC Controller

[ralfbalzer]

I upgraded my Project to .Net 7.0.
Since then, the debugger and building the solution, raises an error on assigning "Empty" to a string in an MVC Controller.

It raises the error "cannot convert source type to 'Microsoft.AsoNetCore.Mvc.EmptyResult' to target type 'string' "

Using "string.Empty" works fine.

[mkArtakMSFT]

Thanks for contacting us.
The error you're getting is valid, as there is no implicit conversation operator defined for the EmptyResult type. Please note, that the EmptyResult type is not related to the String type.
Based on your later comment, it looks like you did intend to use the String type here as you used String.Empty as an alternative which works.

[ralfbalzer]

The code worked in netcore 6. So something must have changed. In any casee, I have changed my code accordingly and all is working now.

[brunolins16]

@ralfbalzer I know that you already fixed your code but just to let you know that the change that cause issues for you is #40515. Since you defined a static using using static System.String you were able to just use Empty and it would reference magically 😂 to String.Empty, but, since the ControllerBase now has a Empty property it is not magically reference anymore.