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BOOK: Professional ASP.NET 3.5 : in C# and VB ISBN: 978-0-470-18757-9
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Old April 20th, 2011, 09:19 AM
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Default Including NameTable Optimization (page 513)


I don't know much about ASP.NET (yet), but I do know about polymorphism...
The code in listing 10-7 (and subsequent listings where the same technique is used), are not using the atomized strings...

From listing 10-7:

NameTable nt = new NameTable();
object book = nt.Add( "book" );
if ( ... && book.Equals( reader.LocalName ) )
The Add() method returns a string. So, the book variable, even though it's of type object, references a string object.
Since string overrides the Equals() method, the comparison will actually be a string comparison, and not an object reference comparison, as was intended. Polymorphism will cause the string override of Equals() to be called.

What the code should be in order to optimize it with the use of atomized strings is:
if ( ... && ReferenceEquals( book, reader.LocalName ) )
ReferenceEquals() is implemented by System.Object and compares the object references. book is a reference to the atomized string, so it will actually be compared to the atomized Reader.LocalName object reference.


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