const string path = "customers.txt"; // located in bin/Debug folder
/// <summary>
/// ReadCustomers is called to read information stored in a file
/// </summary>
/// <returns> a list of customer entities</returns>
public static List <Customer> ReadCustomers()
{
//List<Customer> custList = new Customer();
List <Customer> custList = new List <Customer>();
string line; // next line from the file
string[] fields; // line broken into fields
using (FileStream fs = new FileStream(path, FileMode.OpenOrCreate,
FileAccess.Read))
{
using (StreamReader sr = new StreamReader(fs))
{
while (!sr.EndOfStream)// while there is still unread data
{
line = sr.ReadLine();
fields = line.Split(',');// split where the commas are
//Create corresponding Customer entity based on the 'Type'
if (Convert.ToChar(fields[2]) == 'R')
{
Residential c = new Residential();
c.Name = fields[0];
c.AccountType = Convert.ToChar(fields[2]);
c.ChargeAmount = Convert.ToDecimal(fields[3]);
c.AccountNumber = Convert.ToInt32(fields[1]);
custList.Add(c); // add it to the list
}
else if (Convert.ToChar(fields[2]) == 'C')
{
Commercial c = new Commercial();
c.Name = fields[0];
c.AccountNumber = Convert.ToInt32(fields[1]);
c.AccountType = Convert.ToChar(fields[2]);
c.ChargeAmount = Convert.ToDecimal(fields[3]);
custList.Add(c); // add it to the list
}
else if (Convert.ToChar(fields[2]) == 'I')
{
Industrial c = new Industrial();
c.Name = fields[0];
c.AccountNumber = Convert.ToInt32(fields[1]);
c.AccountType = Convert.ToChar(fields[2]);
c.ChargeAmount = Convert.ToDecimal(fields[3]);
custList.Add(c); // add it to the list
}
}
} // closes sr and recycles
} // closes fs and recycles
return(custList); // returns the list of customers read from disk
}
// Fires when the Calculate button is clicked, will test for valid data and
// set various Customer object (or derivatives)
private void btnCalculate_Click(object sender, EventArgs e)
{
// Create a Base Customer object that will hold the object info
// set a few varibles for later use
int hours = 0, opHours = 0;
string name;
// set default customer 'Type' to residential
char type = 'R';
// check if we have a client name
if (Validator.IsPresent(txtName, "Name"))
{
name = txtName.Text; // set the name variable
// Check txtInput for a valid integer, if false, display error icon
// and select data in field
if (Int32.TryParse(txtInput.Text, out int val))
{
// if the test passes, clear any previous errors and set the hours variable
errorProvider1.SetError(txtInput, "");
hours = Convert.ToInt32(txtInput.Text);
}
else
{
// if the test fails. flash the error icon, select bad data
// and set the focus on text field
errorProvider1.SetError(txtInput, "Invalid data");
txtInput.SelectAll();
txtInput.Focus();
}
if (radCommercial.Checked)
{
type = 'C'; // sets the 'Type' as Commercial;
// creates a new Commercial customer object
Commercial client = new Commercial();
client.Hours = hours; // set the usage hours
client.Name = name; // set name attribute
client.AccountType = type; // set the 'Type'
client.CalculateRate(); // calculate the payout
customers.Add(client); // add the customer to the List
}
else if (radIndustrial.Checked)
{
// sets the opHours variable to be passed into the method
// Check txtOffPeak for a valid integer, if false,
// display error icon and select data in field
if (Int32.TryParse(txtOffPeak.Text, out val))
{
// if the test passes, clear any previous errors and set the opHours variable
errorProvider1.SetError(txtOffPeak, "");
opHours = Convert.ToInt32(txtOffPeak.Text);
}
else
{
// if the test fails. flash the error icon, select bad data
// and set the focus on test field
errorProvider1.SetError(txtOffPeak, "Invalid data");
txtOffPeak.SelectAll();
txtOffPeak.Focus();
}
type = 'I'; // sets the type as Industrial
Industrial client = new Industrial(); // creates a new Industrial customer object
client.PeakHours = hours; // sets Peak usage
client.OffPeakHours = opHours; // set Off Peak usage
client.Name = name; // set name
client.AccountType = type; // set 'Type'
client.CalculateRate(); // Calculate the payout
customers.Add(client); // add the customer to the List
}
else
{
// type is (R)esidential by default
// create new Residential customer object
Residential client = new Residential();
client.Hours = hours; // sets usage hours
client.Name = name; // set Name
client.AccountType = type; // set 'Type'
client.CalculateRate(); // Calculate the Payout
customers.Add(client); // add the customer to the List
}
DisplayCustomers(); // update the ListView
}
}