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' Show the directory listing. lblCurrentDir.Text = "Currently showing " & path gridFileList.DataSource = files gridDirList.DataSource = dirs Page.DataBind() ' Clear any selection. gridFileList.SelectedIndex = -1 ' Keep track of the current path. ViewState("CurrentPath") = path End Sub When the page first loads, it calls this method to show the current application directory: Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) If (Not Page.IsPostBack) Then ShowDirectoryContents(Server.MapPath(".")) End If End Sub You ll notice that the ShowDirectoryContents() method stores the currently displayed directory in view state. That allows the Move Up button to direct the user to a directory that s one level above the current directory: Protected Sub cmdUp_Click(ByVal sender As Object, ByVal e As System.EventArgs) Dim strPath As String = CStr(ViewState("CurrentPath")) strPath = Path.Combine(strPath, "..") strPath = Path.GetFullPath(strPath) ShowDirectoryContents(strPath) End Sub To move down through the directory hierarchy, the user simply needs to click a directory link. This is raised as a SelectedIndexChanged event. The event handler then displays the new directory: Protected Sub gridDirList_SelectedIndexChanged( ByVal source As Object, ByVal e As EventArgs) ' Get the selected directory. Dim dir As String = CStr(gridDirList.DataKeys(gridDirList.SelectedIndex).Value) ' Now refresh the directory list to ' show the selected directory. ShowDirectoryContents(dir) End Sub But what happens if a user selects a file from the second GridView In this case, the code retrieves the full file path, creates a new FileInfo object, and binds it to a FormView control, which uses a template to display several pieces of information about the file. Figure 13-2 shows the result.

For example, if you execute this query: SELECT FirstName, LastName FROM Employees FOR XML AUTO you ll receive results like this: <Employees FirstName="Nancy" LastName="Davolio"/> <Employees FirstName="Andrew" LastName="Fuller"/> <Employees FirstName="Janet" LastName="Leverling"/> ... As you can see, each record is a separate element, with all the fields as attributes. The other easy option is FOR XML AUTO, ELEMENTS. Here s an example: SELECT FirstName, LastName FROM Employees FOR XML AUTO, ELEMENTS In this case, the data you ll receive uses separate elements for each row and each field, as shown here: <Employees> <FirstName>Nancy</FirstName> <LastName>Davolio</LastName> </Employees> <Employees> <FirstName>Andrew</FirstName> <LastName>Fuller</LastName> </Employees> <Employees> <FirstName>Janet</FirstName> <LastName>Leverling</LastName> </Employees>

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The problem here is that the FullName property never returns a trailing backslash For example, c:\temp\ becomes just c:\temp However, there s one exception the root directory c:\, which always includes a trailing backslash As a result, this seemingly logical code generates the nonsensical path c:\\testtxt and fails The proper solution is to use the SystemIOPath class, which provides static helper methods that perform common path manipulation tasks In this case, the Combine() method neatly solves the problem and works with any directory and file, as follows: DirectoryInfo dirInfo = new DirectoryInfo(@"c:\"); string file = "testtxt"; string path = PathCombine(dirInfoFullName, file); Minor hiccups like this are bothersome, but they aren t serious A more significant problem is the security risk of a canonicalization error.

You can also fine-tune the format in much more painstaking detail using the FOR XML EXPLICIT syntax. For example, this allows you to convert some fields to attributes and others to elements. Refer to the SQL Server Books Online for more information. Unfortunately, the FOR XML query syntax is specific to SQL Server and isn t supported by other database products.

Here s the code that binds the file information when a file is selected: Protected Sub gridFileList_SelectedIndexChanged( ByVal sender As Object, ByVal e As System.EventArgs) ' Get the selected file. Dim file As String = CStr(gridFileList.DataKeys(gridFileList.SelectedIndex).Value) ' The FormView shows a collection (or list) of items. ' To accommodate this model, you must add the file object ' to a collection of some sort. Dim files As ArrayList = New ArrayList() files.Add(New FileInfo(file)) ' Now show the selected file. formFileDetails.DataSource = files formFileDetails.DataBind() End Sub The FormView uses the following template: <asp:FormView id="formFileDetails" runat="server"> <ItemTemplate> <b>File: <%# DataBinder.Eval(Container.DataItem, "FullName") %></b><br> Created at <%# DataBinder.Eval(Container.DataItem, "CreationTime") %><br> Last updated at <%# DataBinder.Eval(Container.DataItem, "LastWriteTime") %><br> Last accessed at <%# DataBinder.Eval(Container.DataItem, "LastAccessTime") %><br> <i><%# DataBinder.Eval(Container.DataItem, "Attributes") %></i><br>

Canonicalization errors are a specific type of application error that can occur when your code assumes that user-supplied values will always be in a standardized form Canonicalization errors are low-tech but quite serious, and they usually have the result of allowing a user to perform an action that should be restricted One infamous type of canonicalization error is SQL injection, whereby a user submits incorrectly formatted values to trick your application into executing a modified SQL command ( 7 covered SQL injection in detail) Other forms of canonicalization problems can occur with file paths and URLs For example, consider the following method that returns file data from a fixed document directory: FileInfo file = new FileInfo(ServerMapPath("Documents\\" + txtBoxText)); // (Read the file and display it in another control) This code looks simple enough.

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