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Yes.Application/Admins/Themes/ThemeService.cs

@@ -0,0 +1,23 @@
+
+namespace Yes.Application.Admins.Themes
+{
+    public class ThemeService(IWebHostEnvironment env) : IThemeService
+    {
+        private readonly IWebHostEnvironment _env = env;
+
+
+        public void CheckThemeExists(string theme)
+        {
+            var themePath = Path.Combine(_env.ContentRootPath, "files", "themes");
+
+            var directories = Directory.GetDirectories(themePath);
+
+            var jsonPath = Path.Combine(themePath, theme, "config.json");
+
+            if (!File.Exists(jsonPath))
+            {
+                throw new ThemeNotExistsException(theme);
+            }
+        }
+    }
+}