/// <summary>
/// Queries https://api.exchangeratesapi.io for the latest rates of a base currency.
/// </summary>
/// <param name="baseCurrency">The base currency we wish to know exchange rates for.</param>
/// <returns>Returns Task for the exchange rates, use '.Result' to get the actual Value.</returns>
public static async Task <ExchangeRates> GetExchangeRates(string baseCurrency)
{
ExchangeRates rates = new ExchangeRates();
try
{
HttpResponseMessage response = await client.GetAsync("https://api.exchangeratesapi.io/latest?base=" + baseCurrency);
if (response.IsSuccessStatusCode)
{
string data = await response.Content.ReadAsStringAsync();
rates.Base = data.Substring(data.IndexOf("base") + 7, data.IndexOf(',', data.IndexOf("base")) - data.IndexOf("base") - 8);
rates.Date = DateTime.Parse(data.Substring(data.IndexOf("date") + 7, data.IndexOf(',', data.IndexOf("date")) - data.IndexOf("date") - 8));
string[] ratePairs = data.Substring(data.IndexOf("rates") + 8).Split(',');
rates.Rates = new Dictionary <string, double>();
foreach (string ratePair in ratePairs)
{
string[] pair = ratePair.Split(':');
double n = new double();
if (double.TryParse(pair[1], NumberStyles.Any, CultureInfo.InvariantCulture, out n))
{
rates.Rates.Add(pair[0].Trim('"'), n);
}
}
}
}
catch
{
MessageBox.Show("Klarte ikke å få kontakt med WebAPI.");
}
return(rates);
}
/// <summary>
/// Constructor.
/// </summary>
public Exchanger()
{
InitializeComponent();
List <ComboboxItem> fromCurrencyComboboxItems = new List <ComboboxItem>();
List <ComboboxItem> toCurrencyComboboxItems = new List <ComboboxItem>();
foreach (string acceptedCurrency in Program.AcceptedCurrencies)
{
fromCurrencyComboboxItems.Add(new ComboboxItem {
Text = acceptedCurrency + " - " + Program.CurrencyDictionary[acceptedCurrency], Value = acceptedCurrency
});
toCurrencyComboboxItems.Add(new ComboboxItem {
Text = acceptedCurrency + " - " + Program.CurrencyDictionary[acceptedCurrency], Value = acceptedCurrency
});
}
fromCurrencyComboBox.DisplayMember = "Text";
fromCurrencyComboBox.ValueMember = "Value";
fromCurrencyComboBox.DataSource = fromCurrencyComboboxItems;
toCurrencyComboBox.DisplayMember = "Text";
toCurrencyComboBox.ValueMember = "Value";
toCurrencyComboBox.DataSource = toCurrencyComboboxItems;
rates = new ExchangeRates();
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="amount">Amount of base currency converted.</param>
/// <param name="from">Base currency converted from.</param>
/// <param name="to">Currency converted to.</param>
/// <param name="rates">Currency exchange rates of base currency.</param>
public Receipt(double amount, string from, string to, ExchangeRates rates)
{
InitializeComponent();
dateLabel2.Text = rates.Date.ToShortDateString();
amountLabel2.Text = Math.Round(amount, 2, MidpointRounding.AwayFromZero).ToString() + " " + from;
commisionLabel2.Text = Math.Round(Program.CommisionRate * amount, 2, MidpointRounding.AwayFromZero).ToString() + " " + from;
toPayLabel2.Text = Math.Round((1 - Program.CommisionRate) * amount * rates.Rates[to], 2, MidpointRounding.AwayFromZero).ToString() + " " + to;
exchangeRateLabel.Text = "1 " + from + " = " + rates.Rates[to].ToString() + " " + to;
}
/// <summary>
/// Queries API for Exchange rates of a base currency.
/// </summary>
private void GetExchangeRateButton_OnClick(object sender, EventArgs e)
{
if (amountTextBox.Text == "")
{
MessageBox.Show("Vennligst angi et beløp.");
}
else if (double.TryParse(amountTextBox.Text, out amount))
{
from = fromCurrencyComboBox.SelectedValue.ToString();
to = toCurrencyComboBox.SelectedValue.ToString();
rates = Task.Run(() => Program.GetExchangeRates(from)).Result;
toPayTextBox.Text = Math.Round(amount * (1 - Program.CommisionRate) * rates.Rates[to], 2, MidpointRounding.AwayFromZero).ToString();
toPayCurrencyLabel.Text = to;
}
else
{
MessageBox.Show("Vennligst sørg for at beløpet som er angitt er et tall.");
}
}
