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} } private void CreateFileList() { // Retrieve the list of files, and display it in the page. // This code also disables the delete button, ensuring the // user must view the file information before deleting it. string[] fileList = Directory.GetFiles(ftpDirectory); lstFiles.DataSource = fileList; lstFiles.DataBind(); lblFileInfo.Text = ""; cmdDelete.Enabled = false; } protected void cmdRefresh_Click(Object sender, EventArgs e) { CreateFileList(); } protected void lstFiles_SelectedIndexChanged(Object sender, EventArgs e) { // Display the selected file information. // Use the StringBuilder for the fastest way to build the string. System.Text.StringBuilder displayText = new System.Text.StringBuilder(); string fileName = lstFiles.SelectedItem.Text; displayText.Append("<b>"); displayText.Append(fileName); displayText.Append("</b><br /><br />"); displayText.Append("Created: "); displayText.Append(File.GetCreationTime(fileName).ToString()); displayText.Append("<br />Last Accessed: "); displayText.Append(File.GetLastAccessTime(fileName).ToString()); displayText.Append("<br />"); // Show attribute information. GetAttributes() can return a combination // of enumerated values, so you need to evaluate it with the // bitwise and (&) operator. FileAttributes attributes = File.GetAttributes(fileName); if ((attributes & FileAttributes.Hidden) == FileAttributes.Hidden) { displayText.Append("This is a hidden file.<br />"); } if ((attributes & FileAttributes.ReadOnly) == FileAttributes.ReadOnly) { displayText.Append("This is a read-only file.<br />");

cmdDelete.Enabled = false; } else { cmdDelete.Enabled = true; } // Show the generated text in a label. lblFileInfo.Text = displayText.ToString(); } protected void cmdDelete_Click(Object sender, EventArgs e) { File.Delete(lstFiles.SelectedItem.Text); CreateFileList(); } }

If you ran this example, you would get these results:

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Every time the page loads, it sets the ftpDirectory string. The path is set to the FTP subfolder in the current web application directory (which is provided by the Request.PhysicalApplicationPath property). These two details (the current web application directory and the FTP subfolder) are fused together into one path string using the Combine() method of the Path class. The CreateFileList() procedure is easy to code, because it uses the data-binding feature of the ListBox. The array returned from the GetFiles() method can be placed in the list with just a couple of lines of code. The AutoPostBack property of the ListBox is set to true. That way, when the user chooses an item in the list, the ListBox posts the page back immediately so the code can read the file information and refresh the file details on the page. When evaluating the FileAttributes enumeration, you need to use the & operator to perform bitwise arithmetic. This is because the value returned from GetAttributes() can actually contain a combination of more than one attribute. Using bitwise arithmetic, you can pull out just the attribute that you re interested in, and then determine whether it s set. The code that gets the file information builds a long string of text, which is then displayed in a label. For optimum performance, this code uses the System.Text.StringBuilder class. Without the StringBuilder, you d need to use string concatenation to join the string together. This is much slower, because every time the code adds a piece of text to the string, .NET creates an entirely new string object behind the scenes.

The code that displays file information could benefit by switching to the FileInfo class (as shown in the next section). As it is, every method needs to specify the same file name. This is a bit tedious, and it s a bit slower because each method requires a separate security check. One ingredient this code lacks is error handling. When using any external resource, including files, it s essential that you defend yourself with a try/catch block. This way you can deal with unpredictable occurrences that are beyond your control for example, if the file isn t accessible because it s already open in another program, or the account running the code doesn t have the required permissions. The code in this example is easy to correct simply wrap all the file operations into a try/catch block. (You ll need three one for the code that reads the files in the current directory, one for the code that retrieves the information from the selected file, and one for the code that deletes the file.) To see the code with the added errorhandling logic, refer to the downloadable samples for this chapter.

<body> <h1>Dynamic Lists</h1> <ul id="groceries"> <li>Bread</li> </ul> <input type="text" id="newItem"/> <input type="button" value="Add Item" onclick="addItem();"/> </body> </html> You ll notice that we re taking advantage of a couple of features besides just the Insertion class. We re using $F() to get the value we want to add to the list, and then we use the Field class to clear out the input field. Obviously we ve hard-coded some of this for simplicity, but it wouldn t be hard to spiff this up. In the end, this gives us a page like Figure 3-4.

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