net core 2.1 code first out parameters does´t work (no replies)

I have to try to call stored procedure, with out parameter and its imposible, doesnt works,

for example:

var numRes = new MySql.Data.MySqlClient.MySqlParameter
{
ParameterName = "numResults",
DbType = System.Data.DbType.Int32,
Direction = System.Data.ParameterDirection.Output
};

dbcontext.Entity.fromSql("call procedure(@p1, @numResults")", var, numRes).toList();

where @numResultsits a out parameter

somebody have a solution?

thanks