public UserPortfolio BuyShare(int portfolioId, int shareId, int quantity)
{
var userPortfolio = _userPortfolioService.Get(portfolioId);
var share = _shareService.Get(shareId);
var totalPrice = share.Price * quantity;
if (userPortfolio.Cash < totalPrice)
{
throw new NotEnoughCashException();
}
if (userPortfolio.Shares.ContainsKey(shareId))
{
userPortfolio.Shares[shareId] += quantity;
}
else
{
userPortfolio.Shares.Add(shareId, quantity);
}
userPortfolio.Cash -= totalPrice;
_userPortfolioService.Update(userPortfolio);
return(userPortfolio);
}
