/// <summary>
/// Use MNB Client to retrieve Available Currencies
/// </summary>
private void GetAndProcessAvailableCurrencies()
{
try
{
var currencyResponse = client.GetCurrencies(new GetCurrenciesRequestBody()).GetCurrenciesResult;
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(currencyResponse);
XmlNodeList nodes = xmlDoc.SelectNodes(MNB_CURRENCIES_PER_CURRENCIES_PER_CURR);
foreach (XmlNode node in nodes)
{
// Skip if node is null or empty
if (string.IsNullOrWhiteSpace(node.InnerText))
{
continue;
}
CurrencyWrapper currencyWrapper = new CurrencyWrapper()
{
CurrencyName = node.InnerText
};
bool currencyAlreadyPresent = CurrenciesRetrieved.Any(curr => curr.CurrencyName == node.InnerText);
if (!currencyAlreadyPresent)
{
CurrenciesRetrieved.Add(currencyWrapper);
}
}
}
catch (XmlException)
{
ShowErrorMessage("Could not parse the response from MNB while querying available currencies");
}
catch (System.Xml.XPath.XPathException e)
{
ShowErrorMessage($"XML structure is inconsistent with assumption. Could not retrieve structure of {MNB_CURRENCIES_PER_CURRENCIES_PER_CURR}");
}
catch (Exception e)
{
ShowErrorMessage(e.Message);
}
}
/// <summary>
/// Query the MNB Client to retrieve Exchange rates for given currencies
/// </summary>
/// <param name="start">DateTime: The start date to be used in the query</param>
/// <param name="end">DateTime: The end date to be used in the query</param>
/// <param name="currencyNames">IList<string>: The names of the currencies to be used in the query</param>
private void GetAndProcessExchangeRates(DateTime start, DateTime end, IList <string> currencyNames)
{
try
{
string startDate = start.ToString(DATE_REQUEST_FORMAT);
string endDate = end.ToString(DATE_REQUEST_FORMAT);
var currencies = string.Join(",", currencyNames);
GetExchangeRatesRequestBody requestBody = new GetExchangeRatesRequestBody()
{
startDate = startDate,
endDate = endDate,
currencyNames = currencies
};
GetExchangeRatesResponseBody exchangeRatesResponseBody = client.GetExchangeRates(requestBody);
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(exchangeRatesResponseBody.GetExchangeRatesResult);
XmlNodeList rawNodes = xmlDoc.SelectNodes(MNB_EXCHANGE_RATES_PER_DAY);
foreach (XmlNode rawNode in rawNodes)
{
// Retrieve the day of the FX rate and store it in variable: date
XmlNode rawDate = rawNode.Attributes.GetNamedItem(MNB_DATE_ATTRIBUTE_NAME);
DateTime.TryParse(rawDate.Value, out DateTime date);
// check if date is not included
var dateIsAlreadyAdded = CurrencySnapshotDate.Any(item => item.Date == date);
if (!dateIsAlreadyAdded)
{
var newFxDate = new FxDateWrapper()
{
Date = date,
};
CurrencySnapshotDate.Add(newFxDate);
}
// Iterate through child nodes and retrieve the unit and curr from attributes - and fx rate from innerText
foreach (XmlNode currencyRate in rawNode.ChildNodes)
{
// Find currency by name
XmlNode currAttrib = currencyRate.Attributes.GetNamedItem(MNB_CURRENCY_ATTRIBUTE_NAME);
var currencyWrapper = CurrenciesRetrieved.FirstOrDefault(currName => currName.CurrencyName.Equals(currAttrib.Value, StringComparison.InvariantCultureIgnoreCase));
if (currencyWrapper is null)
{
continue;
}
// feed currency unit to currencyWrapper
XmlNode unitAttrib = currencyRate.Attributes.GetNamedItem(MNB_UNIT_ATTRIBUTE_NAME);
if (Int32.TryParse(unitAttrib.Value, out int result))
{
currencyWrapper.RateUnit = result;
}
// Feed rate into currencyWrapper
currencyWrapper.CurrencyRates.Add(new Currency()
{
Date = date,
RawRate = currencyRate.InnerText
});
}
}
}
catch (Exception e)
{
string error = e.Message;
ShowErrorMessage(error);
}
}
/// <summary>
/// Query the MNB Client to retrieve Exchange rates for given currencies
/// </summary>
private void GetAndProcessExchangeRates()
{
GetAndProcessExchangeRates(startDate, endDate, CurrenciesRetrieved.Select(name => name.CurrencyName).ToList());
}
