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Introducing Silverlight Book: Code Update

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If you're reading Introducing Silverlight and are having some trouble with the code in Chapter 8 for the tracking textblocks sample, there's a missing line of code that defines a global variable.

Here's the full C# code for the TextBlocks sample:

    1: using System;

    2: using System.Windows;

    3: using System.Windows.Controls;

    4: using System.Windows.Documents;

    5: using System.Windows.Ink;

    6: using System.Windows.Input;

    7: using System.Windows.Media;

    8: using System.Windows.Media.Animation;

    9: using System.Windows.Shapes;

   10:  

   11: namespace SilverlightProject2

   12: {

   13:     public partial class Page : Canvas

   14:     {

   15:         string strCurrentText;

   16:         public void Page_Loaded(object o, EventArgs e)

   17:         {

   18:             // Required to initialize variables

   19:             InitializeComponent();

   20:             foreach (TextBlock tt in this.Children)

   21:             {

   22:                 tt.MouseEnter += new MouseEventHandler(OnEnter);

   23:                 tt.MouseLeave += new EventHandler(OnLeave);

   24:             }

   25:         }

   26:         public void OnEnter(object sender, MouseEventArgs e)

   27:         {

   28:             TextBlock tt = sender as TextBlock;

   29:             strCurrentText = tt.Text;

   30:             tt.Text = "I am in : " + strCurrentText;

   31:         }

   32:         public void OnLeave(object sender, EventArgs e)

   33:         {

   34:             TextBlock tt = sender as TextBlock;

   35:             tt.Text = strCurrentText;

   36:         }

   37:     }

   38: }

 

And here's what the final result looks like:

image

Many thanks to Jeff Paries for catching this one! :)

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