public QuoteCollection this[int year, int month]
{
get
{
ContractInfomation contract = new ContractInfomation(Commodity, year, month);
return(Group.ContainsKey(contract) ? Group[contract] : null);
}
}
public QuoteCollection(ContractInfomation contract, string source, RecordType type, List <Quote> quotes)
: this(contract.ToString(), source, type, quotes)
{
}