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Figure 8-6 shows how the expression 14 << 3 would be evaluated in a byte. This operation causes the following: Each of the bits in the operand (14) is shifted three places to the left. The three bit positions vacated on the right end are filled with 0s. The resulting value is 112.

We re now only one method short of a sort-of-useful program, and that s the one that trawls through this information to find and display matches: DisplayMatches, which is shown in Example 11-9.

private static void DisplayMatches( IEnumerable<FileNameGroup> filesGroupedByName) { var groupsWithMoreThanOneFile = from nameGroup in filesGroupedByName where nameGroup.FilesWithThisName.Count > 1 select nameGroup; foreach (var fileNameGroup in groupsWithMoreThanOneFile) { // Group the matches by the file size, then select those // with more than 1 file of that size. var matchesBySize = from file in fileNameGroup.FilesWithThisName group file by file.FileSize into sizeGroup where sizeGroup.Count() > 1 select sizeGroup; foreach (var matchedBySize in matchesBySize) { string fileNameAndSize = string.Format("{0} ({1} bytes)", fileNameGroup.FileNameWithoutPath, matchedBySize.Key); WriteWithUnderlines(fileNameAndSize); // Show each of the directories containing this file foreach (var file in matchedBySize) { Console.WriteLine(Path.GetDirectoryName(file.FilePath)); } Console.WriteLine(); }

}

}

Figure 8-7. Bitwise shifts The following code implements the preceding examples: int a, b, x = 14; a = x << 3; b = x >> 3; // Shift left // Shift right

private static void WriteWithUnderlines(string text) { Console.WriteLine(text); Console.WriteLine(new string('-', text.Length)); }

We start with a LINQ query that looks for the filenames that crop up in more than one folder, because those are the only candidates for being duplicates. We iterate through

each such name with a foreach loop. Inside that loop, we run another LINQ query that groups the files of that name by size see the first emphasized lines in Example 11-9. If InspectDirectories discovered three files called Program.cs, for example, and two of them were 278 bytes long while the other was 894 bytes long, this group clause would separate those three files into two groups. The where clause in the same query removes any groups that contain only one file. So the matchesBySize variable refers to a query that returns a group for each set of two or more files that have the same size (and because we re inside a loop that iterates through the names, we already know they have the same name). Those are our duplicate candidates. We then write out the filename and size (and an underline separator of the same length). Finally, we write out each file location containing candidate matches using Path.GetDirectoryName. If we compile and run that lot, we ll see the following output:

The trivial component also defines a method called greet. This method displays a greeting message using the alert function. Its purpose is to demonstrate that you can declare methods in a component the same way as in a client class created with the Microsoft Ajax Library.

Find duplicate files ==================== Looks for possible duplicate files in one or more directories Usage: findduplicatefiles [/sub] DirectoryName [DirectoryName] ... /sub - recurse into subdirectories

Console.WriteLine("{0} << 3 = {1}", x, a); Console.WriteLine("{0} >> 3 = {1}", x, b); This code produces the following output: 14 << 3 = 112 14 >> 3 = 1

We haven t given it anywhere to look! How are we going to test our application Well, we could provide it with some command-line parameters. If you open the project properties and switch to the Debug tab, you ll see a place where you can add commandline arguments (see Figure 11-1).

However, we could do a bit better for test purposes. Example 11-10 shows a modified Main that supports a new /test command-line switch, which we can use to create test files and exercise the function.

static void Main(string[] args) { bool recurseIntoSubdirectories = false; if (args.Length < 1) { ShowUsage();

}

The assignment operators evaluate the expression on the right side of the operator and use that value to set the value of the variable-type expression on the left side of the operator. As in C and C++, the value assigned to the left-hand side can be modified if the operator is a compound assignment operator. The assignment operators are listed in Table 8-14. The assignment operators are binary and left-associative. Table 8-14. The Assignment Operators

return;

int firstDirectoryIndex = 0; IEnumerable<string> directoriesToSearch = null; bool testDirectoriesMade = false; try {

// Check to see if we are running in test mode if (args.Length == 1 && args[0] == "/test") { directoriesToSearch = MakeTestDirectories(); testDirectoriesMade = true; recurseIntoSubdirectories = true; } else { if (args.Length > 1) { // see if we're being asked to recurse if (args[0] == "/sub") { if (args.Length < 2) { ShowUsage(); return; } recurseIntoSubdirectories = true; firstDirectoryIndex = 1; } } // Get list of directories from command line. directoriesToSearch = args.Skip(firstDirectoryIndex);

}

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