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

Modified @HouseCat's solution to be case insensitive:

    /// 

    /// Maps a SqlDataReader record to an object. Ignoring case.
    /// 
    /// 
    /// 
    /// 
    /// https://stackoverflow.com/a/52918088
    public static void MapDataToObject(this SqlDataReader dataReader, T newObject)
    {
        if (newObject == null) throw new ArgumentNullException(nameof(newObject));

        // Fast Member Usage
        var objectMemberAccessor = TypeAccessor.Create(newObject.GetType());
        var propertiesHashSet =
                objectMemberAccessor
                .GetMembers()
                .Select(mp => mp.Name)
                .ToHashSet(StringComparer.InvariantCultureIgnoreCase);

        for (int i = 0; i < dataReader.FieldCount; i++)
        {
            var name = propertiesHashSet.FirstOrDefault(a => a.Equals(dataReader.GetName(i), StringComparison.InvariantCultureIgnoreCase));
            if (!String.IsNullOrEmpty(name))
            {
                objectMemberAccessor[newObject, name]
                    = dataReader.IsDBNull(i) ? null : dataReader.GetValue(i);
            }
        }
    }

EDIT: This does not work for List or multiple tables in the results.

EDIT2: Changing the calling function to this works for lists. I am just going to return a list of objects no matter what and get the first index if I was expecting a single object. I haven't looked into multiple tables yet but I will.

    public async Task> ExecuteReaderAsync(string storedProcedureName, SqlParameter[] sqlParameters = null) where T : class, new()
    {
        var newListObject = new List();
        using (var conn = new SqlConnection(_connectionString))
        {
            conn.Open();
            SqlCommand sqlCommand = GetSqlCommand(conn, storedProcedureName, sqlParameters);
            using (var dataReader = await sqlCommand.ExecuteReaderAsync(CommandBehavior.Default))
            {
                if (dataReader.HasRows)
                {
                    while (await dataReader.ReadAsync())
                    {
                        var newObject = new T();
                        dataReader.MapDataToObject(newObject);
                        newListObject.Add(newObject);
                    }
                }
            }
        }
        return newListObject;
    }