private void enterButton_Click(object sender, EventArgs e)
{
// store TextBox values string array
string[] values = GetTextBoxValues();
// Record containing TextBox values to serialize
Record record = new Record();
// determine whether TextBox account field is empty
if (values[(int)TextBoxIndices.ACCOUNT] != "")
{
// store TextBox values in Record and serialize Record
try
{
// get account number value from TextBox
int accountNumber = Int32.Parse(
values[(int)TextBoxIndices.ACCOUNT]);
// determine whether accountNumber is valid
if (accountNumber > 0)
{
// store TextBox fields in Record
record.Account = accountNumber;
record.FirstName = values[(int)TextBoxIndices.FIRST];
record.LastName = values[(int)TextBoxIndices.LAST];
record.Balance = Decimal.Parse(
values[(int)TextBoxIndices.BALANCE]);
// write Record to file, fields separated by commas
fileWriter.WriteLine(
record.Account + "," + record.FirstName + "," +
record.LastName + "," + record.Balance);
} // end if
else
{
// notify user if invalid account number
MessageBox.Show("Invalid Account Number", "Error",
MessageBoxButtons.OK, MessageBoxIcon.Error);
} // end else
} // end try
// notify user if error occurs in serialization
catch (IOException)
{
MessageBox.Show("Error Writing to File", "Error",
MessageBoxButtons.OK, MessageBoxIcon.Error);
} // end catch
// notify user if error occurs regarding parameter format
catch (FormatException)
{
MessageBox.Show("Invalid Format", "Error",
MessageBoxButtons.OK, MessageBoxIcon.Error);
} // end catch
}
}
// invoked when user clicks credit balances,
// debit balances or zero balances button
private void getBalances_Click( object sender, System.EventArgs e )
{
// convert sender explicitly to object of type button
Button senderButton = ( Button ) sender;
// get text from clicked Button, which stores account type
string accountType = senderButton.Text;
// read and display file information
try
{
// go back to the beginning of the file
input.Seek( 0, SeekOrigin.Begin );
displayTextBox.Text = "The accounts are:\r\n";
// traverse file until end of file
while ( true )
{
string[] inputFields; // stores individual pieces of data
Record record; // store each Record as file is read
decimal balance; // store each Record's balance
// get next Record available in file
string inputRecord = fileReader.ReadLine();
// when at the end of file, exit method
if ( inputRecord == null )
return;
inputFields = inputRecord.Split( ',' ); // parse input
// create Record from input
record = new Record(
Convert.ToInt32( inputFields[ 0 ] ), inputFields[ 1 ],
inputFields[ 2 ], Convert.ToDecimal( inputFields[ 3 ] ) );
// store record's last field in balance
balance = record.Balance;
// determine whether to display balance
if ( ShouldDisplay( balance, accountType ) )
{
// display record
string output = record.Account + "\t" +
record.FirstName + "\t" + record.LastName + "\t";
// display balance with correct monetary format
output += String.Format( "{0:F}", balance ) + "\r\n";
// copy output to screen
displayTextBox.AppendText( output );
} // end if
} // end while
} // end try
// handle exception when file cannot be read
catch ( IOException )
{
MessageBox.Show( "Cannot Read File", "Error",
MessageBoxButtons.OK, MessageBoxIcon.Error );
} // end catch
}
/// <summary>
/// Cycles through all the records in the file and closes all open file
/// handles once the end has been reached.
/// </summary>
/// <param name="sender">The object sending the event</param>
/// <param name="e">The arguments being sent by the event</param>
private void nextButton_Click(object sender, EventArgs e)
{
try
{
// Get the next record
string inputRecord = fileReader.ReadLine();
string[] inputFields; // Stores each field of data
if (inputRecord != null)
{
// Split the string into records
inputFields = inputRecord.Split(',');
Record record = new Record(
Convert.ToInt32(inputFields[0]),
inputFields[1],
inputFields[2],
Convert.ToDecimal(inputFields[3]));
// Copy string array values to TextBox values
SetTextBoxValues(inputFields);
}
else
{
// Close StreamReader
fileReader.Close();
// Close FileStream if no Records in file
input.Close();
// Enable Open File button
openButton.Enabled = true;
// Disable Next Record button
nextButton.Enabled = false;
// Clear All TextBox Controls
this.ClearTextBoxes();
// Notify user if no Records in file
MessageBox.Show("There are no more records left in the file.", "End of Records",
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
catch (IOException err)
{
MessageBox.Show("Error Reading from File: " + err.Message, "Error",
MessageBoxButtons.OK, MessageBoxIcon.Error);
// Enable Open File button
openButton.Enabled = true;
// Disable Next Record button
nextButton.Enabled = false;
}
}