HostBuilder enables ValidateOnBuild/ValidateScopes in development environment
Previously, no validation was enabled by default. Now, in the development environment, ValidateOnBuild and ValidateScopes are enabled.
Version introduced
.NET 9 Preview 7
Previous behavior
ValidateOnBuild and ValidateScopes defaulted to false and were only enabled when they were explicitly set by calling UseDefaultServiceProvider.
New behavior
In the development environment when options haven't been set with UseDefaultServiceProvider, ValidateOnBuild and ValidateScopes are set to true.
Type of breaking change
This change is a behavioral change.
Reason for change
Validation helps to catch problems early in application startup rather than later (or not at all) when the application interacts with its service provider.
Recommended action
No action necessary if your application validates successfully. If you do see a validation error when testing in development, first try to fix it. If you can't fix it, you can disable validation by calling UseDefaultServiceProvider.
