public IActionResult Index(double FromAmount, string FromCurrency, string ToCurrency)
{
if (FromCurrency == ToCurrency)
{
ViewBag.Result = 0;
ViewBag.Rate = "";
ViewBag.FromAmount = FromAmount;
ViewBag.Error = "The currency you want to exchange is the same as the currency you want to receive.";
}
else
{
ViewBag.FromAmount = FromAmount;
double rate = HttpClientHandler.GetExchangeRateAsync(FromCurrency, ToCurrency);
ViewBag.Result = FromAmount * rate;
ViewBag.Rate = $"•1 {FromCurrency} = {rate} {ToCurrency}";
ExchangeHistory exchangeHistory = new ExchangeHistory();
exchangeHistory.Date = DateTime.UtcNow;
exchangeHistory.FromAmount = FromAmount;
exchangeHistory.FromCurrency = FromCurrency;
exchangeHistory.ToAmount = ViewBag.Result;
exchangeHistory.ToCurrency = ToCurrency;
dataManager.ExchangeHistory.SaveExchangeHistory(exchangeHistory);
}
return(View());
}