What's the fastest way to clear the isolatedstoragestore for a windows phone 7 application? - optimization

Question

I'm currently working on an application which writes data to the IsolatedStorageStore. As part of the app, I'd like to implement a "clear all data/reset" button, but enumerating through all the files that exist and all the folders that exist is taking quite a bit of time. Is there a magic "reset" method or something I can use, or should I instead focus on optimizing the manual deletion process?
Or can I get away with not providing such functionality, and leave it to the user to uninstall/reinstall the application for a reset?
My hideous delete-all-files method is below:
/// <summary>
/// deletes all files in specified folder
/// </summary>
/// <param name="sPath"></param>
public static void ClearFolder(String sPath, IsolatedStorageFile appStorage)
{
//delete all files
string[] filenames = GetFilenames(sPath);
if (filenames != null)
{
foreach (string sFile in filenames)
{
DeleteFile(System.IO.Path.Combine(sPath, sFile));
}
}
//delete all subfolders if directory still exists
try
{
foreach (string sDirectory in appStorage.GetDirectoryNames(sPath))
{
ClearFolder(System.IO.Path.Combine(sPath, sDirectory) + #"\", appStorage);
}
}
catch (DirectoryNotFoundException ex)
{
//current clearing folder was deleted / no longer exists - return
return;
}
//try to delete this folder
try
{
appStorage.DeleteDirectory(sPath);
}
catch (ArgumentException ex) { }
}
/// <summary>
/// Attempts to delete a file from isolated storage - if the directory will be empty, it is also removed.
/// </summary>
/// <param name="sPath"></param>
/// <returns></returns>
public static void DeleteFile(string sPath)
{
using (IsolatedStorageFile appStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
appStorage.DeleteFile(sPath);
String sDirectory = System.IO.Path.GetDirectoryName(sPath);
//if this was the last file inside this folder, remove the containing folder
if (appStorage.GetFileNames(sPath).Length == 0)
{
appStorage.DeleteDirectory(sDirectory);
}
}
}
/// <summary>
/// Returns an array of filenames in a given directory
/// </summary>
/// <param name="sHistoryFolder"></param>
/// <returns></returns>
public static string[] GetFilenames(string sDirectory)
{
using (IsolatedStorageFile appStorage = IsolatedStorageFile.GetUserStoreForApplication())
{
try
{
return appStorage.GetFileNames(sDirectory);
}
catch (DirectoryNotFoundException)
{
return null;
}
}
}

Answer 1

You're looking for the Remove() method.
Use it like this:
using (var store = IsolatedStorageFile.GetUserStoreForApplication())
{
store.Remove();
}