C# 5.0 Programmer's Reference

Chapter 14 ❘ 671
When the user clicks on an author, the following code displays that author’s book titles.
// Display the books by the selected author.
private void authorListBox_SelectedIndexChanged(object sender, EventArgs e)
{
string author = authorListBox.SelectedItem.ToString();
string value = Books[author];
string[] books = value.Split(',');
booksListBox.DataSource = books;
}
This code gets the selected author’s name and then uses it to get the value for that author.
It uses the Split method to split the value string into an array of book titles and sets the
books ListBox’s DataSource property to the resulting array.
4. The CarList example program does this. Download the example to see how it works.
5. The ReverseList example program uses the following code to create and reverse its list
of characters.
private void Form1_Load(object sender, EventArgs e)
{
// Make the original list.
List original = new List() { 'A', 'B', 'C', 'D', 'E' };
originalListTextBox.Text = new string(original.ToArray());
// LINQ.
var linq =
from char letter in original
orderby letter descending
select letter;
linqTextBox.Text = new string(linq.ToArray());
// Reverse.
List reversed = new List(original);
reversed.Reverse();
reverseTextBox.Text = new string(reversed.ToArray());
// Stack.
Stack stack = new Stack();
// Add the characters to the stack.
foreach (char ch in original) stack.Push(ch);
// Remove the characters from the stack.
List result = new List();
while (stack.Count > 0) result.Add(stack.Pop());
}
// Display the result.
stackTextBox.Text = new string(result.ToArray());
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