/// <summary>
/// Method to add or insert customers to the list.
/// </summary>
/// <param name="pos">Index position for Customer List</param>
private void InsertCustomer(int pos)
{
int k; // Basic KWH used
int o; // Offpeak KWH used (in case of Industrial customer)
string n; // To hold customer name;
Customer c; // For new customer to be stored into
// First, let us validate the data that is supposed to be entered
if ((Validator.IsPresent(txtName) && Validator.WithinLength(txtName, 20) &&
Validator.IsNumberWithinRange(txtKWH1, 0, 999999)) == false)
{
// if the data entered cannot be validated, then exit here.
return;
}
// Grab the Customer name and KWH from the form.
n = txtName.Text;
k = Int32.Parse(txtKWH1.Text);
// Check which radio button is selected and create new Customer object accordingly
if (rbResidential.Checked == true)
{
c = new Residential(n, k);
}
else if (rbIndustrial.Checked == true)
{
// Let's validate the second KWH text box here because we need to grab the second KWH value.
if (Validator.IsNumberWithinRange(txtKWH2, 0, 999999) == false)
{
// if the data entered cannot be validated, then exit here.
return;
}
o = Int32.Parse(txtKWH2.Text);
c = new Industrial(n, k, o);
}
else // Obviously, this is a Commercial customer if neither of the first two radio buttons are clicked
{
c = new Commercial(n, k);
}
// Calculate the bill for the new customer, then insert customer to List
c.CalculateBill();
cust.Insert(pos, c);
// Display all of the customers into the listbox
lstCustomers.Items.Clear();
foreach (Customer d in cust)
{
lstCustomers.Items.Add(d.ToString());
}
// Clear the Name and the KWH entry boxes and select the Name text box (for convenience)
txtName.Text = "";
txtKWH1.Text = "";
txtKWH2.Text = "";
txtName.Select();
}
private void rbIndustrial_CheckedChanged(object sender, EventArgs e)
{
// When Industrial radio button is checked
// We ask that the user enter peak and off-peak hours
// Change the labels
lblKWH1.Text = "Peak kWh Used:";
lblKWH2.Text = "Off-Peak kWh Used:";
// Clear the two KWH entry boxes
txtKWH1.Text = "";
txtKWH2.Text = "";
// Set the tags for the KWH entry boxes
txtKWH1.Tag = "Peak kWh Used";
txtKWH2.Tag = "Off-Peak kWh Used";
// Enable _BOTH_ entry boxes here
txtKWH1.ReadOnly = false;
txtKWH2.ReadOnly = false;
// Provide the Industrial description in the rich text box
rtbCustDesc.Text = Industrial.CustomerDescription();
}
/// <summary>
/// Load data from the file to the arrays; returns boolean flag that indicates success
/// </summary>
/// <param name="cust">The customer list is passed.</param>
/// <returns>Whether the file was read successfully or not.</returns>
public static bool LoadData(List <Customer> cust)
{
// The following code was borrowed from an example that was demonstrated in Lecture #1 of ICT-711 (with some modifications)
FileStream fs;
StreamReader sr; // for file reading
string line; // one line from the file
string[] parts; // line will be split into multiple parts
Customer c; // Customer object
try
{
// open the file
fs = new FileStream(savePath, FileMode.Open, FileAccess.Read);
sr = new StreamReader(fs);
}
catch (FileNotFoundException ex)
{
MessageBox.Show(ex.Message);
return(false);
}
// file opened successfully
// read all lines, storing data in the cust List
try
{
while (!sr.EndOfStream)
{
line = sr.ReadLine(); // read next line
parts = line.Split(','); // split the line into parts using comma as delimiter
switch (parts[0]) // Verify the first item in the line, which determines the type of customer
{
// This is a Residential customer, and we read the next 2 items in the line to
// create the object, calculate it's bill and add it to the Customer List.
case "R":
c = new Residential(parts[1], Int32.Parse(parts[2]));
c.CalculateBill();
cust.Add(c);
break;
// This is an Industrial customer, and we read the next 3 items in the line to
// create the object, calculate it's bill and add it to the Customer List.
case "I":
c = new Industrial(parts[1], Int32.Parse(parts[2]), Int32.Parse(parts[3]));
c.CalculateBill();
cust.Add(c);
break;
// This is a Commercial customer, and we read the next 2 items in the line to
// create the object, calculate it's bill and add it to the Customer List.
case "C":
c = new Commercial(parts[1], Int32.Parse(parts[2]));
c.CalculateBill();
cust.Add(c);
break;
// If we get here, then obviously the line that was read is invalid, so we do nothing.
default:
break;
}
}
// If we get here, then the file was read successfully.
sr.Close();
return(true);
}
// Catch any exceptions to the attempts at file reading above.
catch (IOException ex)
{
MessageBox.Show("I/O error occurred while reading from the file: " +
ex.Message);
return(false);
}
catch (Exception ex)
{
MessageBox.Show("Unanticipated error occurred while reading from the file: " +
ex.Message);
return(false);
}
finally
{
sr.Close();
}
}