Use TryAddSingleton instead of AddSingleton for extension

[amerjusupovic]

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[Copilot]

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (2)

src/Microsoft.Extensions.Configuration.AzureAppConfiguration/AzureAppConfigurationRefresherProvider.cs:42

• The constructor calls DiscoverRefreshers() to initialize _refreshers but does not set _rediscoveredRefreshers to true, so the property getter may invoke DiscoverRefreshers() again. Consider setting _rediscoveredRefreshers to true in the constructor after the initial discovery if that behavior is not intended.

            _refreshers = DiscoverRefreshers();

src/Microsoft.Extensions.Configuration.AzureAppConfiguration/AzureAppConfigurationExtensions.cs:103

• [nitpick] Switching from AddSingleton to TryAddSingleton prevents duplicate registrations. Please confirm that this change aligns with the intended dependency injection behavior for scenarios where multiple registrations may occur.

                services.TryAddSingleton<IConfigurationRefresherProvider, AzureAppConfigurationRefresherProvider>();