Mike Francis: My Mobile Home - Windows Phone 7 : Code Snippet: Enumerate Files in Isolated Storage

Friday, June 25, 2010

Windows Phone 7 : Code Snippet: Enumerate Files in Isolated Storage

This sample code uses the IsolatedStorageFile class to create a few test directories and populates them with files. Then it recursively enumerates the files and directories, displaying the output in the debug window.

 public void EnumerateIsolatedStorageFiles()
{
    try
    {
        // Get an isolated store for this applicaiton and put it into an
        // IsolatedStorageFile object.
 
        using (IsolatedStorageFile isoStore = 
            IsolatedStorageFile.GetUserStoreForApplication())
        {
            // Create sub directories and create files 
            // in them to test enumeration
            isoStore.CreateDirectory("A");
            IsolatedStorageFileStream streamA =
                new IsolatedStorageFileStream(@"A\TestFileA.Txt", FileMode.Create, isoStore);
 
            isoStore.CreateDirectory("B");
            IsolatedStorageFileStream streamB = 
                new IsolatedStorageFileStream(@"B\TestFileB.Txt", FileMode.Create, isoStore);
 
            isoStore.CreateDirectory("C");
            IsolatedStorageFileStream streamC = 
                new IsolatedStorageFileStream(@"C\TestFileC.Txt", FileMode.Create, isoStore);
 
            isoStore.CreateDirectory(@"C\1");
            IsolatedStorageFileStream streamC1 = 
                new IsolatedStorageFileStream(@"C\1\TestFileC1.Txt", FileMode.Create, isoStore);
 
            isoStore.CreateDirectory(@"D\1\2\3\4\5");
            IsolatedStorageFileStream streamD = 
                new IsolatedStorageFileStream(@"D\1\2\3\4\5\TestFileD.Txt", FileMode.Create, isoStore);
 
            streamA.Close();
            streamB.Close();
            streamC.Close();
            streamC1.Close();
            streamD.Close();
 
            // There might be a small delay between when the above code
            // executes and when the files are created in the store.
            // Closing and opening the store in this example ensures that
            // the common language runtime has finished creating the files.
        } // using
 
        using (IsolatedStorageFile isoStore = 
            IsolatedStorageFile.GetUserStoreForApplication())
        {
            // List files in root
            foreach (string file in isoStore.GetFileNames())
            {
                Debug.WriteLine(file);
            }
            // Recursively enumerate sub-directories and list contents
            GetFiles(isoStore, @"\");
        } // using
    }
    catch (IsolatedStorageException e)
    {
        Debug.WriteLine(e.Message);
    }
}
 
// Recursively enumerate sub-directories
void GetFiles(IsolatedStorageFile isoStore, string directory)
{
    string[] DirNames;
    if (directory == @"\") 
        DirNames = isoStore.GetDirectoryNames();
    else
        DirNames = isoStore.GetDirectoryNames(directory + @"\*");
 
    foreach (string dir in DirNames)
    {
        string mDir = 
            directory == @"\" ? directory + dir : directory + @"\" + dir;
        foreach (string file in isoStore.GetFileNames(mDir + @"\*.*"))
        {
            Debug.WriteLine(file);
        }
        GetFiles(isoStore, mDir);
    }
}
 