/// <summary>
/// Method, that analyze the request and generate requested data
/// </summary>
/// <param name="ar">IAsyncResult</param>
public static void ReadCallback(IAsyncResult ar)
{
String content = String.Empty;
ClassWebService CWS = new ClassWebService();
DollarRates CDR = CWS.GetCurrencyFromOpenExchangeRate();
// Retrieve the state object and the handler socket
// from the asynchronous state object.
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.workSocket;
// Read data from the client socket.
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
// There might be more data, so store the data received so far.
state.sb.Append(Encoding.ASCII.GetString(
state.buffer, 0, bytesRead));
// Check for end-of-file tag. If it is not there, read
// more data.
content = state.sb.ToString();
if (content.IndexOf("<EOF>") > -1)
{
// All the data has been read from the
// client. Display it on the console.
Console.WriteLine("Read {0} bytes from socket. \n Data : {1}",
content.Length, content);
// Echo requested data back to the client.
if (content == "OE<EOF>")
{
string response = RateListToString(CDR);
Send(handler, response);
}
else if (content.IndexOf("<EOF>") == 3)
{
string country = content.Substring(0, 3);
string response = CDR.GetRateFromCountryCode(country);
Send(handler, response);
}
// Echo the data back to the client.
else
{
Send(handler, content);
}
}
else
{
// Not all data received. Get more.
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
new AsyncCallback(ReadCallback), state);
}
}
}
/// <summary>
/// Method, that converts a Rates Dicttionary into a Semicolon separated string
/// </summary>
/// <param name="CDR">DollarRates</param>
/// <returns>string</returns>
private static string RateListToString(DollarRates CDR)
{
string sdr = "";
foreach (var item in CDR.rates)
{
sdr += item.Key + ";" + item.Value.ToString() + ";";
}
string result = sdr.Remove(sdr.ToString().LastIndexOf(";"), 1);
return(result);
}