After upgrading the project from .NET 6 to .NET 8 and updating Entity Framework Core nuget-package from version 6 to version 8, I encountered the following error related to materialization of data while executing store-procedures:

Error #1. IRelationalValueBufferFactoryFactory could not be found (are you missing a using directive or an assembly reference?)

Error #2. LegacyTypeMaterializationInfo.Index: no suitable method found to override Cnhi.Common.EntityFramework (net8.0)

In EF Core 6, as per my analysis IRelationalValueBufferFactoryFactory instance was being used to materialize raw SQL data into DbSet objects while executing stored procedures. However, it seems that this interface is either removed or has undergone changes in EF Core 8. I couldn’t find any direct references to it in the new version from the below links:

https://learn.microsoft.com/en-us/ef/core/what-is-new/ef-core-8.0/breaking-changes

https://learn.microsoft.com/en-us/dotnet/api/microsoft.entityframeworkcore.storage.irelationalvaluebufferfactory?view=efcore-6.0

https://learn.microsoft.com/en-us/dotnet/api/microsoft.entityframeworkcore.storage?view=efcore-8.0

I attempted to substitute the logic with RelationalCommand to manually handle the SQL query results using FromSql() and ExecuteSqlRaw(), but I think they don’t fully address the need for materializing raw SQL results directly into entities as the application was doing earlier.

I don’t know much about what exactly the previous functionality was doing end to end, and changing the existing code might affect at other places. So, I’m looking for a way to substitute the logic that previously used IRelationalValueBufferFactoryFactory in EF Core 6.

        public class StoredProcedureExecutor
{
 private readonly IRelationalValueBufferFactoryFactory valueBufferFactoryFactory; // This is error #1
         public StoredProcedureExecutor(DbContext dbContext, string procName)
     {
         this.dbContext = dbContext;
         materializerSource = dbContext.GetService<IEntityMaterializerSource>();
         typeMappingSource = dbContext.GetService<IRelationalTypeMappingSource>();
         valueBufferFactoryFactory = dbContext.GetService<IRelationalValueBufferFactoryFactory>(); // This is error #1
    
         command = dbContext.Database.GetDbConnection().CreateCommand();
         command.CommandText = procName;
         command.CommandType = CommandType.StoredProcedure;
     }
        private async Task<IEnumerable<T>> ReadResultAsync<T>(DbDataReader reader, Type type)
        {
            var entityType = dbContext.Model.FindEntityType(type);
            var materialize = materializerSource.GetMaterializer(entityType);
    
            IDictionary<string, int> columnIndexes = Enumerable.Range(0, reader.FieldCount)
                .ToDictionary(reader.GetName, i => i);
    
            var typeMaterializationInfos = entityType.GetProperties()
                    .Select(
                        x =>
                        {
                            var columnIndex = columnIndexes[x.GetColumnName()];
    
                            return new LegacyTypeMaterializationInfo(x.PropertyInfo.PropertyType, x, typeMappingSource.GetMapping(x), columnIndex);
                        }
                    )
                    .ToArray();
    
            ICollection<T> entities = new List<T>();
            var valueBufferFactory = valueBufferFactoryFactory.Create(typeMaterializationInfos);
            while (await reader.ReadAsync())
            {
                var valueBuffer = valueBufferFactory.Create(reader);
                var entity = (T)materialize(new MaterializationContext(valueBuffer, dbContext));
                if (entityType.GetKeys().Any())
                {
                    stateManager.StartTrackingFromQuery(entityType, entity, valueBuffer);
                }
                entities.Add(entity);
            }
            return entities;
        }
        internal sealed class LegacyTypeMaterializationInfo : TypeMaterializationInfo
    {
        public LegacyTypeMaterializationInfo(Type modelClrType, IProperty property, RelationalTypeMapping mapping, int index, bool? nullable = null) : base(modelClrType, property, mapping, nullable)
        {
            Index = index;
        }
    
        public override int Index { get; } // This is error #2
    }
}