} // end tbInfix_Enter
/// <summary>
/// Attempts to convert text that is in infix expression text box to postfix expression
/// </summary>
/// <param name="sender">The generate postfix button</param>
/// <param name="e">The event instance containing information about the event</param>
private void btnGenerate_Click(object sender, EventArgs e)
{
string infix = tbInfix.Text;
Postfix newPostfix = new Postfix(infix);
tbPostfix.Text = newPostfix.PostfixExpression;
} // end btnGenerate_Click
} // end InfixToPostfixForm_Load
#endregion
#region Events
/// <summary>
/// Allows user to open a text file with infix expressions and convert to postfix notation
/// </summary>
/// <param name="sender">The open file menu option</param>
/// <param name="e">The event instance containing the event data</param>
private void openInfixDataFileToolStripMenuItem_Click(object sender, EventArgs e)
{
string path = string.Empty;
// Setup an open file dialog
OpenFileDialog dlg = new OpenFileDialog( );
dlg.Filter = "text files|*.txt;*.text|all files|*.*";
dlg.InitialDirectory = @"..\..\InfixFiles";
dlg.Title = "Select a Text File with Infix Expressions to Convert";
// Try to get the text file from the dialog
if (dlg.ShowDialog( ) == DialogResult.OK)
{
path = dlg.FileName;
}
else
{
MessageBox.Show(this, "No file selected. You must select a text file containing " +
"infix expressions to use the Infix to Postfix program.", "No File Selected",
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
StreamReader rdr = null;
string line = string.Empty;
try
{
rdr = new StreamReader(path);
// Read data until end of file
while (rdr.Peek( ) != -1)
{
line = rdr.ReadLine( );
// Create postfix expressions
Postfix newPostfix = new Postfix(line);
postfixes.Add(newPostfix);
}
}
catch (Exception)
{
MessageBox.Show(this, "File could not be opened. Please select a valid text " +
"file containing infix expressions.", "Error Opening File",
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
finally
{
if (rdr != null)
{
rdr.Close( );
}
}
// Update infix expression list box
foreach (Postfix pf in postfixes)
{
listBoxInfix.Items.Add(pf.InfixExpression);
}
listBoxInfix.Enabled = true;
listBoxInfix.SelectedIndex = 0;
} // end openInfixDataFileToolStripMenuItem_Click
