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Figure 13-1. Browsing the file system The directory listing is built using two separate GridView controls, one on top of the other. The topmost GridView shows the directories, and the GridView underneath shows files. The only visible differences to the user are that the directories don t display length information and have a folder icon next to their names. The ShowHeader property of the second GridView is set to false so that the two grids blend into each other fairly seamlessly. And because the GridView controls are stacked together, as the list of directories grows the list of files moves down the page to accommodate it. Technically, you could handle the directory and file listing using one GridView object. That s because all FileInfo and DirectoryInfo objects have a common parent the FileSystemInfo object. However, in this grid you want to show the size in bytes of each file, and you want to differentiate the appearance (in this case, through different icons). Because the DirectoryInfo object doesn t provide a Length property, trying to bind to it in a more generic list of FileSystemInfo objects would cause an error.

This problem has another, equally effective solution. You could create a single GridView but not bind directly to the FileInfo.Length property. Instead, you would bind to a method in the page class that examines the current data object and return either the length (for FileInfo objects) or a blank string (for DirectoryInfo objects). You could construct a similar method to hand out the correct icon URL.

By default, the markup used to display errors is specified by a special Python class called , which lives at . This behaves just like a standard Python list, except that it has some extra methods for outputting its values as HTML. In particular, it has two methods by default, and , which output errors as an unordered list or as unadorned text, respectively.

Here s the declaration for the GridView control that provides the file list, without the formattingspecific style properties:

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<asp:GridView ID="gridDirList" runat="server" AutoGenerateColumns="False" OnSelectedIndexChanged="gridDirList_SelectedIndexChanged" GridLines="None" CellPadding="0" CellSpacing="1" DataKeyNames="FullName"> <Columns> <asp:TemplateField> <ItemTemplate> <img src="folder.jpg" /> </ItemTemplate> </asp:TemplateField> <asp:ButtonField DataTextField="Name" CommandName="Select" HeaderText="Name" /> <asp:BoundField HeaderText="Size" /> <asp:BoundField DataField="LastWriteTime" HeaderText="Last Modified" /> </Columns> </asp:GridView> This grid binds to an array of DirectoryInfo objects and displays the Name, Size, and LastWriteTime properties. In addition, the FullName property is designated as a key field so that you can return the full path after the user clicks one of the directories. You ll also notice that one of the columns doesn t actually display any information that s the BoundColumn for length that displays header text, but it doesn t link to any data field. The GridView for the files follows immediately. Here s the slightly shortened control tag: <asp:GridView ID="gridFileList" runat="server" AutoGenerateColumns="False" OnSelectedIndexChanged="gridFileList_SelectedIndexChanged" GridLines="None" CellPadding="0" CellSpacing="1" DataKeyNames="FullName"> <SelectedRowStyle BackColor="#C0FFFF" /> <Columns> <asp:TemplateField> <ItemTemplate> <img src="file.jpg" /> </ItemTemplate> </asp:TemplateField> <asp:ButtonField DataTextField="Name" CommandName="Select" /> <asp:BoundField DataField="Length" /> <asp:BoundField DataField="LastWriteTime" /> </Columns> </asp:GridView> Note that the GridView for displaying files must define a SelectedRowStyle because it supports file selection. The next step is to write the code that fills these controls. The star of the show is a private method named ShowDirectoryContents(), which retrieves the contents of the current folder and binds the two GridView controls. Here s the complete code: private void ShowDirectoryContents(string path) { // Define the current directory. DirectoryInfo dir = new DirectoryInfo(path); // Get the DirectoryInfo and FileInfo objects. FileInfo[] files = dir.GetFiles(); DirectoryInfo[] dirs = dir.GetDirectories();

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