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And since we ensure that we read exactly the same quantity from all the files for each chunk (either 1 KB, or however much is left when we get to the end of the file), all the streams advance in unison This code has a somewhat more complex structure than before The all-in-memory version in Example 11-39 had three loops the outer one advanced one byte at a time, and then the inner two worked through the various potential match combinations But because the outer loop in Example 11-44 advances one chunk at a time, we end up needing an extra inner loop to compare all the bytes in a chunk We could have simplified this by only ever reading a single byte at a time from the streams, but in fact, this chunking has delivered a significant performance improvement.

The following code executes the switch statement five times, with the value of x ranging from 1 to 5. From the output, you can tell which case section was executed on each cycle through the loop. for( int x=1; x<6; x++ ) { switch( x ) // Evaluate the value of variable x. { case 2: // If x equals 2 Console.WriteLine ("x is {0} -- In Case 2", x); break; // Go to end of switch. case 5: Console.WriteLine ("x is {0} -- In Case 5", x); break; default: // If x is neither 2 nor 5 Console.WriteLine ("x is {0} -- In Default case", x); break; // Go to end of switch. } } The output of the preceding code is the following: x x x x x is is is is is 1 2 3 4 5 -----In In In In In Default case Case 2 Default case Default case Case 5 // If x equals 5

Testing against a folder full of source code, media resources, and compilation output containing 4,500 files (totaling about 500 MB), the all-in-memory version took about 17 seconds to find all the duplicates, but the stream version took just 35 seconds! Profiling the code revealed that this performance improvement was entirely a result of the fact that we were comparing the bytes in chunks So for this particular application, the additional complexity was well worth it (Of course, you should always measure your own code against representative problems techniques that work well in one scenario don t necessarily perform well everywhere).

What if we wanted to step forward or backward in the file We can do that with the Seek method. Let s imagine we want to print out the first 100 bytes of each file that we reject, for debug purposes. We can add some code to our CompareBytes method to do that, as Example 11-45 shows.

For the employee lookup logic, create a simple class called HumanResources.cs, and copy the code in listing 1.7.

if (sourceFileContent[i] != otherFileContent[i]) { sourceFileEntry.Value.RemoveAt(otherIndex); otherIndex -= 1; if (sourceFileEntry.Value.Count == 0) { sourceFilesWithNoMatches.Add(sourceFileEntry.Key);

} #if DEBUG // Remember where we got to long currentPosition = sourceFileEntry.Key.Content.Position; // Seek to 0 bytes from the beginning sourceFileEntry.Key.Content.Seek(0, SeekOrigin.Begin); // Read 100 bytes from for (int index = 0; index < 100; ++index) { var val = sourceFileEntry.Key.Content.ReadByte(); if (val < 0) { break; } if (index != 0) { Console.Write(", "); } Console.Write(val); } Console.WriteLine(); // Put it back where we found it sourceFileEntry.Key.Content.Seek(currentPosition, SeekOrigin.Begin); #endif break; }

A switch statement can have any number of switch sections, including none. The default section is not required, as shown in the following example. It is, however, generally considered good practice to include it, since it can catch potential errors. For example, the switch statement in the following code has no default case. The switch statement is inside a for loop, which executes the statement five times, with the value of x starting at 1 and ending at 5. for( int x=1; x<6; x++ ) { switch( x ) { case 5: Console.WriteLine("x is {0} -- In Case 5", x); break; } } The output of this code is the following:

We start by getting hold of the current position within the stream using the Position property. We do this so that the code doesn t lose its place in the stream. (Even though we ve detected a mismatch here, remember we re comparing lots of files here perhaps this same file matches one of the other candidates. So we re not necessarily finished with it yet.) The first parameter of the Seek method tells us how far we are going to seek from our origin we re passing 0 here because we want to go to the beginning of the file. The second tells us what that origin is going to be. SeekOrigin.Begin means the beginning of the file, SeekOrigin.End means the end of the file (and so the offset counts backward you don t need to say 100, just 100). There s also SeekOrigin.Current which allows you to move relative to the current position. You could use this to read 10 bytes ahead, for example (maybe to work out what you were looking at in context), and then seek back to where you were by calling Seek(-10, SeekOrigin.Current).

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