Advanced Topics in .NET framework

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Create a store for current user/assembly. Dim store As IsolatedStorageFile = IsolatedStorageFile.GetStore( _ IsolatedStorageScope.User Or IsolatedStorageScope.Assembly, Nothing, Nothing) Dim availableBytes As Long = Convert.ToInt64(store.MaximumSize) _ Convert.ToInt64(store.CurrentSize) Console.WriteLine( Available bytes = {0}", availableBytes)
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The IsolatedStorageFile class exposes both an instance version and a static version of the Remove method. The instance version removes a specific store, whereas the static version deletes all the stores for the current user:
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Create a store for current user/assembly.
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Dim store As IsolatedStorageFile = IsolatedStorageFile.GetStore( _
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IsolatedStorageScope.User Or IsolatedStorageScope.Assembly, Nothing, Nothing) Remove the store. store.Remove() Delete all the stores associated with the current user. IsolatedStorageFile.Remove(IsolatedStorageScope.User)
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You can create a directory inside a store by calling the CreateDirectory method. The argument you pass to this method can specify multiple directory levels; the command ensures that all intermediate directories are created if necessary. If the directory exists already, no exception is thrown. For example, look at the following code:
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Create a store for current user/assembly.
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Dim store As IsolatedStorageFile = IsolatedStorageFile.GetStore( _
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IsolatedStorageScope.User Or IsolatedStorageScope.Assembly, Nothing, Nothing) Create the AAA directory. store.CreateDirectory( AAA ) Create the BBB directory and the BBB\CCC directory. store.CreateDirectory( BBB\CCC ) Create a file in BBB\CCC directory. Dim st As New IsolatedStorageFileStream( BBB\CCC\Example.txt", FileMode.Create, store)
Enumerating directories and files in a store requires that you use the GetDirecto ryNames and GetFileNames instance methods of the IsolatedStorageFile object. Both methods take a search argument, which can include * and wildcards in the last por tion of the path for example, \AAA\* or \BBB\CCC\demo*.txt. Thanks to this fea ture, you can build a recursive routine that retrieves the directory tree in a store:
Function GetSubDirectories(ByVal store As IsolatedStorageFile, ByVal path As String) _ As ArrayList Dim res As New ArrayList Add all subdirectories to result. For Each dir As String In store.GetDirectoryNames(path & \* ) res.Add(path & \ & dir)
Recurse on this subdirectory.
res.AddRange(GetSubDirectories(store, path & \ & dir))
Next Return res End Function
34:
Programming for the Internet
Using this function to list all files and directories in a store is a trivial task:
For Each dir As String In GetSubDirectories(store, ) Console.WriteLine( Directory: {0}", dir) For Each file As String In store.GetFileNames(dir & \* ) Console.WriteLine( File: {0}", file) Next Next
You can delete an individual directory or file with the DeleteDirectory or DeleteFile method, respectively. These methods don t take wildcards and the DeleteDirectory method throws an exception if the directory isn t empty. However, you can solve both problems by using the GetFileNames method and the GetSubDirectories function. Here s a routine that deletes a subdirectory tree:
Sub DeleteDirectoryTree(ByVal store As IsolatedStorageFile, ByVal path As String) Delete all files in this directory. For Each file As String In store.GetFileNames(path & \* ) store.DeleteFile(path & \ & file) Next Delete all directory trees in this directory. For Each dir As String In GetSubDirectories(store, path) DeleteDirectoryTree(store, dir) Next Finally, delete the directory, if it isn t the root. If path.Length > 0 Then store.DeleteDirectory(path) End Sub
Common Tasks for Internet-Aware Applications
The .NET Framework includes many classes that let you add Internet-related function ality to your applications for example, to read Web pages or communicate over the TCP protocol. I ll cover some of these classes in this section. Notice that, unlike all the previous samples in this chapter, the code in this section is assumed to run in a trusted assembly.
Requesting a Web Page
Requesting a Web page is the most frequent operation you perform in many Internetrelated applications. You can post an HTTP request to a Web page with the WebClient class, or you can use the WebRequest and WebResponse types for more articulated requests. All these classes are in the System.Net namespace.
The WebClient Class
The simplest technique for posting an HTTP request to a Web page is by means of the WebClient class and its DownloadFile method.
Part VII:
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