Fastest way to map result of SqlDataReader to object

Question

I\'m comparing materialize time between Dapper and ADO.NET and Dapper. Ultimately, Dapper tend to faster than ADO.NET, though the first time a given fetch query was executed

Answer 1

I took both pimbrouwers and HouseCat's answers and come up with me. In my scenario, the column name in database has snake case format.

public static T ConvertToObject(string query) where T : class, new()
    {
        using (var conn = new SqlConnection(AutoConfig.ConnectionString))
        {
            conn.Open();
            var cmd = new SqlCommand(query) {Connection = conn};
            var rd = cmd.ExecuteReader();
            var mappedObject = new T();

            if (!rd.HasRows) return mappedObject;
            var accessor = TypeAccessor.Create(typeof(T));
            var members = accessor.GetMembers();
            if (!rd.Read()) return mappedObject;
            for (var i = 0; i < rd.FieldCount; i++)
            {
                var columnNameFromDataTable = rd.GetName(i);
                var columnValueFromDataTable = rd.GetValue(i);

                var splits = columnNameFromDataTable.Split('_');
                var columnName = new StringBuilder("");
                foreach (var split in splits)
                {
                    columnName.Append(CultureInfo.InvariantCulture.TextInfo.ToTitleCase(split.ToLower()));
                }

                var mappedColumnName = members.FirstOrDefault(x =>
                    string.Equals(x.Name, columnName.ToString(), StringComparison.OrdinalIgnoreCase));

                if(mappedColumnName == null) continue;
                var columnType = mappedColumnName.Type;

                if (columnValueFromDataTable != DBNull.Value)
                {
                    accessor[mappedObject, columnName.ToString()] = Convert.ChangeType(columnValueFromDataTable, columnType);
                }
            }

            return mappedObject;
        }
    }