public void ReadFile(InvoiceCollection invoices)
{
StreamReader infile;
char delimiter = ',';
string line;
string[] fields = new string[4]; // unnecessary assignment of value
if (File.Exists("invoices.txt"))
{
MessageBox.Show("File 'invoices.txt' exists.\n");
}
{
infile = File.OpenText("invoices.txt");
while (!infile.EndOfStream)
{
line = infile.ReadLine();
fields = line.Split(delimiter);
Invoice anInvoice = new Invoice();
anInvoice.number = int.Parse(fields[0]);
anInvoice.custID = int.Parse(fields[1]);
anInvoice.date = DateTime.Parse(fields[2]);
anInvoice.salesAmount = double.Parse(fields[3]);
invoices.AddInvoice(anInvoice);
}
infile.Close();
}
}
private void BtnAddSave_Click(object sender, EventArgs e)
{
if (btnAddSave.Text == "Add")
{
ReadOnlyInputs(false);
dtpDate.Enabled = true;
btnAddSave.Text = "Save";
btnRemove.Text = "Cancel";
cboInvoice.Text = string.Empty;
txtCustID.Clear();
txtAmount.Clear();
cboInvoice.Focus();
}
else
{
try
{
btnRemove.Text = "Remove";
if (txtCustID.Text != string.Empty && txtAmount.Text != string.Empty &&
cboInvoice.Text != string.Empty && dtpDate.Text != string.Empty)
{
Invoice newInvoice = new Invoice();
newInvoice.number = int.Parse(cboInvoice.Text);
newInvoice.custID = int.Parse(txtCustID.Text);
newInvoice.date = dtpDate.Value;
newInvoice.salesAmount = double.Parse(txtAmount.Text);
anInvoiceCollection.AddInvoice(newInvoice);
FillCombo();
cboInvoice.Text = string.Empty;
txtCustID.Text = string.Empty;
txtAmount.Text = string.Empty;
ReadOnlyInputs(true);
dtpDate.Enabled = true;
btnAddSave.Text = "Add";
}
else
{
MessageBox.Show("Data missing", "Error");
btnAddSave.Text = "Save";
btnRemove.Text = "Cancel";
}
}
catch
{
MessageBox.Show("Duplicate number", "Error");
btnAddSave.Text = "Save";
btnRemove.Text = "Cancel";
}
}
}