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Yes.Application/Admins/Themes/UpdateThemeCommandHandler.cs

@@ -0,0 +1,30 @@
+namespace Yes.Application.Admins.Themes
+{
+    public record UpdateThemeCommand(
+        string Theme
+    ) : IRequest<Unit>;
+
+
+    public class UpdateThemeCommandHandler(
+        IOptionsMonitor<BlogSettings> options, 
+        IMapper mapper, 
+        IThemeService  themeService,
+		IConfigurationService configurationService
+	) : IRequestHandler<UpdateThemeCommand, Unit>
+    {
+        private readonly BlogSettings _settings = options.CurrentValue;
+        private readonly IMapper _mapper = mapper;
+        private readonly IThemeService _themeService = themeService;
+        private readonly IConfigurationService _configurationService = configurationService;
+        public async Task<Unit> Handle(UpdateThemeCommand request, CancellationToken cancellationToken)
+        {
+            _themeService.CheckThemeExists(request.Theme);
+
+            _mapper.Map(request, _settings);
+
+            await _configurationService.SaveConfiguration(_settings);
+
+            return new Unit();
+        }
+    }
+}