} //getAllConversionRates
//get rates all currencies
private void threadAllConversionRates(ArrayList alCurrencyNames)
{
bool dbStatus = true;
foreach (CurrencyClass currencyFrom in alCurrencyNames)
{
foreach (CurrencyClass currencyTo in alCurrencyNames)
{
if (!currencyFrom.getShortName().Equals(currencyTo.getShortName()) && dbStatus)
{
RateClass rate = getSingleConversionRate(currencyFrom, currencyTo, false);
if (rate != null)
{
dbStatus = clsDB.saveRate(rate);
} //if
} //if
} //foreach
} //foreach
} //threadAllConversionRates
//Method used for saving rates into the database
public bool saveRate(RateClass rate)
{
bool Successful = false;
CurrencyClass ccFrom = rate.getFrom();
CurrencyClass ccTo = rate.getTo();
//If entry does not exist insert it
if (checkForDuplicate(rate) == false)
{
try
{
string insert = "INSERT INTO CurrencyConverter ([CurFromLong], [CurFromShort], [CurToLong], [CurToShort], [Rate], [DateTime]) VALUES (@CurFromLong, @CurFromShort, @CurToLong, @CurToShort, @Rate, @DateTime);";
OleDbCommand cmd = new OleDbCommand(insert, MyConn);
cmd.Parameters.AddWithValue("@CurFromLong", ccFrom.getLongName());
cmd.Parameters.AddWithValue("@CurFromShort", ccFrom.getShortName());
cmd.Parameters.AddWithValue("@CurToLong", ccTo.getLongName());
cmd.Parameters.AddWithValue("@CurToShort", ccTo.getShortName());
cmd.Parameters.AddWithValue("@Rate", rate.getRate().ToString());
cmd.Parameters.AddWithValue("@DateTime", rate.getTimeDate().ToString());
cmd.ExecuteNonQuery();
Successful = true;
} //endtry
catch {}
} //endif
//if entry does exist, update it
else
{
try
{
string update = "UPDATE CurrencyConverter SET [Rate]=@Rate, [DateTime]=@DateTime WHERE CurFromShort LIKE '" + ccFrom.getShortName() + "' AND CurToShort LIKE '" + ccTo.getShortName() + "'";
OleDbCommand cmd = new OleDbCommand(update, MyConn);
cmd.Parameters.AddWithValue("@Rate", rate.getRate().ToString());
cmd.Parameters.AddWithValue("@DateTime", rate.getTimeDate().ToString());
cmd.ExecuteNonQuery();
Successful = true;
}//endtry
catch
{
//returns false
} //endcatch
} //endelse
return(Successful);
} //Saverate
} //threadAllConversionRates
public RateClass getSingleConversionRate(CurrencyClass ccFrom, CurrencyClass ccTo, bool useDB)
{
RateClass rate = null;
try
{
//Regular expression to extract conversion rate from HTML
Regex regexRate = new Regex("bld>([0-9]*\\.?[0-9]*)");
WebRequest request = WebRequest.Create("https://www.google.com/finance/converter?a=1&from=" + ccFrom.getShortName() + "&to=" + ccTo.getShortName());
WebResponse response = request.GetResponse();
Stream data = response.GetResponseStream();
string html = String.Empty;
StreamReader reader = new StreamReader(data);
//Read one line of HTML at a time until criteria is met then extract rate
while (reader.Peek() >= 0)
{
html = reader.ReadLine();
if (html.Contains("span class=bld"))
{
Match matchRate = regexRate.Match(html);
if (matchRate.Success)
{
Debug.WriteLine("Rate from " + ccFrom.getShortName() + " to " + ccTo.getShortName() + " is " + matchRate.Groups[1].Value);
rate = new RateClass(ccFrom, ccTo, Convert.ToDouble(matchRate.Groups[1].Value), DateTime.Now);
} //if
} //if
} //while
} //try
catch { } //website not reachable
if (useDB)
{
if (rate == null)
{
rate = clsDB.getSingleConversionRate(ccFrom, ccTo);
}//if
else
{
clsDB.saveRate(rate);
} //else
} //if
return(rate);
} //getSingleConversionRate
} //OpenDatabaseConnection
//Checks to see if provided entry already exists in the Database
private bool checkForDuplicate(RateClass rate)
{
try
{
CurrencyClass ccFrom = rate.getFrom();
CurrencyClass ccTo = rate.getTo();
string CommandString = "Select * from CurrencyConverter where CurFromShort like '" + ccFrom.getShortName() + "' and CurToShort like '" + ccTo.getShortName() + "'";
OleDbCommand cmd = new OleDbCommand(CommandString, MyConn);
OleDbDataReader reader = cmd.ExecuteReader();
if (reader.HasRows)
{
return(true);
}
else
{
return(false);
}
}
catch
{
return(false);
}
} //checkForDuplicate
} //Saverate
//Gets single conversion rate from the database
public RateClass getSingleConversionRate(CurrencyClass ccFrom, CurrencyClass ccTo)
{
RateClass rate = null;
string CommandString = "Select * from CurrencyConverter where CurFromShort like '" + ccFrom.getShortName() + "' and CurToShort like '" + ccTo.getShortName() + "'";
OleDbCommand cmd = new OleDbCommand(CommandString, MyConn);
OleDbDataReader reader = cmd.ExecuteReader();
if (reader.RecordsAffected > 1)
{
//more then one record was returned
}//endif
else
{
double rateVal = 0;
DateTime dateAdded = DateTime.Now;
while (reader.Read())
{
rateVal = Convert.ToDouble(reader["Rate"].ToString());
dateAdded = Convert.ToDateTime(reader["DateTime"].ToString());
} //emdwhile
rate = new RateClass(ccFrom, ccTo, rateVal, dateAdded);
} //endelse
return(rate);
} //getSingleConversionRate
} //frmMain_Load
//Converts currencies when the button is clicked
private void btnConvert_Click(object sender, EventArgs e)
{
if (cmbFrom.SelectedItem == cmbTo.SelectedItem)
{
txtTo.Text = txtFrom.Text;
lblAsOf.Text = "As Of " + DateTime.Now;
}//if
else
{
CurrencyClass ccFrom = new CurrencyClass((string)((ComboboxItem)cmbFrom.SelectedItem).Value, ((ComboboxItem)cmbFrom.SelectedItem).Text);
CurrencyClass ccTo = new CurrencyClass((string)((ComboboxItem)cmbTo.SelectedItem).Value, ((ComboboxItem)cmbTo.SelectedItem).Text);
RateClass rate = webParser.getSingleConversionRate(ccFrom, ccTo, true);
Debug.WriteLine(rate.ToString());
if (rate != null)
{
txtTo.Text = "" + (Convert.ToDouble(txtFrom.Text) * rate.getRate());
lblAsOf.Text = "As Of " + rate.getTimeDate().ToString();
}//if
else
{
MessageBox.Show("Could not retrieve conversion rate for " + ccFrom.getShortName() + " to " + ccTo.getShortName() + " at this time!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
} //else
} //else
} //btnConvert_Click