Add JSON function to models

DataAccess/EF_Demo/Data/MSSQL/EventsContext.Custom.cs

@@ -0,0 +1,14 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace EF_Demo.Data.MSSQL;
+
+public partial class EventsContext
+{
+  partial void OnModelCreatingPartial(ModelBuilder modelBuilder)
+  {
+    modelBuilder
+      .HasDbFunction(typeof(DbJson).GetMethod(nameof(DbJson.JsonValue))!)
+      .HasName("JSON_VALUE")
+      .IsBuiltIn();
+  }
+}