C# 4 and .NET 4

778 ❘ ChaPTer 29 mAnipulAtinG files And the reGistry
{
}
throw new FileNotFoundException("File not found: " + fileFullName);
}
textBoxFileName.Text = theFile.Name;
textBoxCreationTime.Text = theFile.CreationTime.ToLongTimeString();
textBoxLastAccessTime.Text = theFile.LastAccessTime.ToLongDateString();
textBoxLastWriteTime.Text = theFile.LastWriteTime.ToLongDateString();
textBoxFileSize.Text = theFile.Length.ToString() + " bytes";
code download FileProperties.sln
Note that you take the precaution of throwing an exception if there are any problems locating a file at the
specified location. The exception itself will be handled in the calling routine (one of the event handlers).
Finally, you define a method, DisplayFolderList(), which displays the contents of a given folder in the
two list boxes. The full pathname of the folder is passed in as a parameter to this method:
protected void DisplayFolderList(string folderFullName)
{
DirectoryInfo theFolder = new DirectoryInfo(folderFullName);
if (!theFolder.Exists)
{
throw new DirectoryNotFoundException("Folder not found: " + folderFullName);
}
ClearAllFields();
textBoxFolder.Text = theFolder.FullName;
currentFolderPath = theFolder.FullName;
// list all subfolders in folder
foreach(DirectoryInfo nextFolder in theFolder.GetDirectories())
listBoxFolders.Items.Add(nextFolder.Name);
}
// list all files in folder
foreach(FileInfo nextFile in theFolder.GetFiles())
listBoxFiles.Items.Add(nextFile.Name);
code download FileProperties.sln
Next, you examine the event handlers. The event handler that manages the event that is triggered when the
user clicks the Display button is the most complex because it needs to handle three different possibilities for
the text the user enters in the text box. For instance, it could be the pathname of a folder, the pathname of a
file, or neither of these:
protected void OnDisplayButtonClick(object sender, EventArgs e)
{
try
{
string folderPath = textBoxInput.Text;
DirectoryInfo theFolder = new DirectoryInfo(folderPath);
if (theFolder.Exists)
{
DisplayFolderList(theFolder.FullName);
return;
}
FileInfo theFile = new FileInfo(folderPath);
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