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The FileInfo and DirectoryInfo objects retrieve information from the file system the first time you query a property. They don t check for new information on subsequent use. This could lead to inconsistency if the file changes in the meantime. If you know or suspect that file system information has changed for the given object, you should call the Refresh() method to retrieve the latest information. The DirectoryInfo class doesn t provide any property for determining the total size information. However, you can calculate the size of all the files in a particular directory quite easily by totaling the FileInfo.Length contribution of each one. Before you take this step, you need to decide whether to include subdirectories in the total. The following method lets you use either approach: Private Shared Function GetDirectorySize(ByVal directory As DirectoryInfo, ByVal includeSubdirectories As Boolean) As Long Dim totalSize As Long = 0 ' Add up each file. Dim files As FileInfo() = directory.GetFiles() For Each file As FileInfo In files totalSize += file.Length Next ' Add up each subdirectory, if required. If includeSubdirectories Then Dim dirs As DirectoryInfo() = directory.GetDirectories() For Each dir As DirectoryInfo In dirs totalSize += CalculateDirectorySize(dir, True) Next End If Return totalSize End Function For information about free space, you need to use the DriveInfo class.

Delete() Exists() GetAttributes() and SetAttributes() GetCreationTime(), GetLastAccessTime(), and GetLastWriteTime() Move()

The simplest way to deal with the hierarchical nature of XML data is to ignore it. In other words, you can bind the XML data source directly to an ordinary grid control such as the GridView. The first step is to define the XML data source and point it to the file that has the content you want to use: <asp:XmlDataSource ID="sourceDVD" runat="server" DataFile="DvdList.xml" /> Now you can bind the GridView with automatically generated columns, in the same way you bind it to any other data source: <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="True" DataSourceID="sourceDVD">

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The DriveInfo class (new in .NET 2.0) allows you to retrieve information about a drive on your computer. Few pieces of information will interest you typically, the DriveInfo class is just used to retrieve the total amount of used and free space. Table 13-6 shows the DriveInfo members. Unlike the FileInfo and DriveInfo classes, there is no Drive class to provide instance versions of these methods. Table 13-6. DriveInfo Members

Create() and CreateText()

Remember, you don t need to use automatically generated columns. If you refresh the schema at design time, Visual Studio will read the DvdList.xml file, determine its structure, and define the corresponding GridView columns explicitly.

Gets the total size of the drive, in bytes. This includes allocated and free space. Gets the total amount of free space, in bytes. Gets the total amount of available free space, in bytes. Available space may be less than the total free space if you ve applied disk quotas limiting the space that the ASP.NET process can use. Returns the name of the file system used on the drive (such as NTFS or FAT32). Returns a value from the DriveType enumeration, which indicates whether the drive is a fixed, network, CD-ROM, RAM, or removable drive. (It returns Unknown if the drive s type cannot be determined.)

Open(), OpenRead(), OpenRead(), and OpenText() ReadAllText(), ReadLines(), and ReadBytes()

Now, when you run the page, the XmlDataSource will extract the data from the DvdList.xml file, provide it to the GridView as an XmlDocument object, and call DataBind(). Because the XmlDocument implements the IEnumerable interface, the GridView can walk through its structure in much the same way as it walks through a DataView. It traverses the XmlDocument.Nodes collection and gets all the attributes for each XmlNode.

Returns whether the drive is ready for reading or writing operations. Removable drives are considered not ready if they don t have any media. For example, if there s no CD in a CD drive, IsReady will return False. In this situation, it s not safe to query the other DriveInfo properties. Fixed drives are always read. Returns the drive letter name of the drive (such as C: or E:). Returns the descriptive volume label for the drive. In an NTFS-formatted drive, the volume label can be up to 32 characters. If not set, this property returns Nothing. Returns a DirectoryInfo object for the root directory in this drive. Retrieves an array of DriveInfo objects, representing all the logical drives on the current computer.

You can use the XmlDataSource programmatically. Call XmlDataSource.GetXmlDocument() to cause it to return the file s content as an XmlDocument object.

WriteAllText(), WriteLines(), and WriteBytes() GetAccessControl()

RootDirectory GetDrives()

However, this has a catch. As explained earlier, the XmlDocument.Nodes collection contains only the first level of nodes. Each of these nodes can contain nested nodes through its own XmlNode.Nodes collection. However, the IEnumerable implementation that the XmlDocument uses doesn t take this into account. It walks over only the upper level of XmlNode objects, and as a result you ll see only the top level of nodes, as shown in Figure 12-9.

The only feature that the File class lacks (and the FileInfo class provides) is the ability to retrieve the size of a specified file.

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