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You begin working with the DirectoryInfo type by specifying a particular directory path as a constructor parameter. If you want to obtain access to the current application directory (i.e., the directory of the executing application), use the "." notation. Here are some examples: ' Bind to the current application directory. Dim dir1 As DirectoryInfo = New DirectoryInfo(".") ' Bind to C:\Windows. Dim dir2 As DirectoryInfo = New DirectoryInfo("C:\Windows") In the second example, you are making the assumption that the path passed into the constructor (C:\Windows) already exists on the physical machine. However, if you attempt to interact with a nonexistent directory, a System.IO.DirectoryNotFoundException is thrown. Thus, if you specify a directory that is not yet created, you will need to call the Create() method before proceeding: ' Bind to a nonexistent directory, then create it. Dim dir3 As DirectoryInfo = New DirectoryInfo("C:\Windows\Testing") dir3.Create() Once you have created a DirectoryInfo object, you can investigate the underlying directory contents using any of the properties inherited from FileSystemInfo. To illustrate, the following class creates a new DirectoryInfo object mapped to C:\Windows (adjust your path if need be) and displays a number of interesting statistics (see Figure 18-2 for the corresponding output): Imports System.IO Module Program Sub Main() Console.WriteLine("***** Fun with Directory(Info) *****") Console.WriteLine() ' Get basic info about C:\Windows Dim dir As DirectoryInfo = New DirectoryInfo("C:\Windows") Console.WriteLine("***** Directory Info *****") Console.WriteLine("FullName: {0}", dir.FullName) Console.WriteLine("Name: {0}", dir.Name) Console.WriteLine("Parent: {0}", dir.Parent) Console.WriteLine("Creation: {0}", dir.CreationTime) Console.WriteLine("Attributes: {0}", dir.Attributes) Console.WriteLine("Root: {0}", dir.Root) Console.WriteLine("**************************") Console.ReadLine() End Sub End Module

exe command-line tool to generate two outputs necessary for the example project: the client proxy source code file and the application configuration file These files are then merged into the client project The SvcUtilexe can generate both For this example, the following command (which should appear on a single line) produces both a proxy class and a configuration file: svcutil /config:newConfigconfig /out:"Example03cs" /n:*,WcfClientExample03 "http://localhost/WcfHelloWorld/Servicesvc wsdl" The command is fairly self-explanatory The /n switch indicates in which namespace the generated proxy class should fall The last parameter is the URL of the service endpoint where you can find schema information Note that you can replace wsdl with mex because SvcUtil exe supports both methods of discovery Further help is available by executing svcutilexe / from the command prompt The next step is to take the output files Example03cs and newConfig.

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The Attributes property exposed by FileSystemInfo provides various traits for the current directory or file, all of which are represented by the FileAttributes enumeration (enum). While the names of this enum are fairly self-describing (e.g., Temporary, Encrypted, etc.), some of the less obvious names are documented here (consult the .NET Framework 2.0 SDK documentation for full details): Enum FileAttributes ReadOnly Hidden ' The file is part of the operating system or is used ' exclusively by the operating system. System Directory Archive ' This name is reserved for future use. Device ' The file is 'normal' as it has no other attributes set. Normal Temporary ' Sparse files are typically large files whose data are mostly zeros. SparseFile ' A block of user-defined data associated with a file or a directory ReparsePoint Compressed Offline ' The file will not be indexed by the operating system's ' content indexing service. NotContentIndexed Encrypted End Enum

In addition to obtaining basic details of an existing directory, you can extend the current example to use some methods of the DirectoryInfo type. First, let s leverage the GetFiles() method to obtain information about all *.bmp files located under the C:\Windows directory. This method returns an array of FileInfo types, each of which exposes details of a particular file (full details of the FileInfo type are explored later in this chapter): Module Program Sub Main() Console.WriteLine("***** Fun with Directory(Info) *****") Console.WriteLine() ' Get basic info about C:\Windows Dim dir As DirectoryInfo = New DirectoryInfo("C:\Windows") ... ' Get info about all *.bmp files in the C:\Windows directory. Dim bitmapFiles As FileInfo() = dir.GetFiles("*.bmp") Console.WriteLine("Found {0} *.bmp files", bitmapFiles.Length) For Each f As FileInfo In bitmapFiles Console.WriteLine() Console.WriteLine("File name: {0}", f.Name) Console.WriteLine("File size: {0}", f.Length) Console.WriteLine("Creation: {0}", f.CreationTime) Console.WriteLine("Attributes: {0}", f.Attributes)

config and merge them into the project You can add the first file, Example03cs, directly to the project by choosing Add Existing Item from the Project menu in Visual Studio 2005 You need to add the second file as an application configuration (Appconfig) file in the project If the project does not already have an Appconfig file, you can add one by again choosing Add Existing Item from the Project menu If there is already an existing Appconfig, you need to merge the section systemserviceModel, ensuring you take all the appropriate child elements Client Code The client code in Example03, shown in Listing 4-7, is a simple call through the proxy class Here, you are leveraging a best practice of the using statement to ensure that the Dispose() method is called The other option is to wrap it in a try...

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