make backend for my site

Utilities/AppDbContextUtilities.cs

@@ -0,0 +1,13 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace yawaflua.ru.Utilities
+{
+    public static class AppDbContextUtilities
+    {
+        public static bool TryGetValue<T>(this DbSet<T> set, Func<T, bool> predicate, out T? value) where T : class
+        {
+            value = set.FirstOrDefault(predicate);
+            return value != null;
+        }
+    }
+}