IsolatedStorageFile不写入文件

Question

I have to store the contents of a control between sessions. This is what I do:

    private void Window_Closing(object sender, CancelEventArgs e)
    {
        IsolatedStorageFile f = IsolatedStorageFile.GetUserStoreForAssembly();
        using(IsolatedStorageFileStream stream = new IsolatedStorageFileStream("somefilename", FileMode.Create, f))
        using(StreamWriter writer = new StreamWriter(stream))
        {
            foreach(string path in searchFoldersListView.Items)
            {
                writer.WriteLine(path);
            }
        }
    }

This is attached to the Closing event of the window. When debugging, the control goes through all the items, but when I run the program again, the control is empty. It turns out that when I navigate to the file, it's empty. When I change the code to save to a regular file by putting a File.AppendAllText() in the foreach loop, that file is saved just fine. Why is that?

EDIT: reading event handler:

    private void Window_Initialized(object sender, EventArgs e)
    {
        IsolatedStorageFile f = IsolatedStorageFile.GetUserStoreForAssembly();
        using(IsolatedStorageFileStream stream = new IsolatedStorageFileStream("somefilename", FileMode.OpenOrCreate, f))
        using(StreamReader reader = new StreamReader(stream))
        {
            string line = reader.ReadLine();
            while(line != null)
            {
                searchFoldersListView.Items.Add(line);
            }
        }
    }

Answer 1

There is a bug in your method that reads from the file. You only read the first line which is probably null . Try the following:

    using(StreamReader reader = new StreamReader(stream))
    {
        string line = reader.ReadLine();
        while(line != null)
        {
            searchFoldersListView.Items.Add(line);
            line = reader.ReadLine();
        }
    }