阅读从创建目录中的文件在isolatedstorage

Question

I am trying to read a written file in a created directory in the isolated storage.. The file is actually being created. but when it is being read it there is an exception "Operation not permitted on IsolatedStorageFileStream."...

using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
{
    if (!storage.DirectoryExists("CourseworkDirectory"))
        storage.CreateDirectory("CourseworkDirectory");

    XElement Coursework = new XElement(CourseworkID);
    XDocument  _doc = new XDocument(new XDeclaration("1.0", "utf-8", "yes"), Coursework);
    IsolatedStorageFileStream location = new IsolatedStorageFileStream("CourseworkDirectory\\"+CourseworkID, System.IO.FileMode.Create, storage);
    StreamWriter file = new StreamWriter(location);  

    _doc.Save(file);//saving the XML document as the file
    file.Close();
    file.Dispose();//disposing the file
    location.Dispose();
}

Reading the file....

using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
{
    string searchpath = System.IO.Path.Combine("CourseworkDirectory", "*.*");

    foreach (string filename in storage.GetFileNames(searchpath))
    {
        XElement _xml;
        IsolatedStorageFileStream location = new IsolatedStorageFileStream(filename, System.IO.FileMode.Open, storage);

It is actually getting the file name but there is an exception at this point.

Answer 1

You can achieve this by doing this---

using (IsolatedStorageFile storage = IsolatedStorageFile.GetUserStoreForApplication())
{
   IsolatedStorageFileStream fileStream = storage.OpenFile(app.getSettingsPath,FileMode.Open, FileAccess.Read);
   using (StreamReader reader = new StreamReader(fileStream ))
   {
      string line;
      while((line = reader.ReadLine()) != null)
      {
         // do your work here
      }
   }
}

Answer 2

Try this, it works for me: Hope it works for you too

        String sb;

        using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())
        {
            if (myIsolatedStorage.FileExists(fileName))
            {
                StreamReader reader = new StreamReader(new IsolatedStorageFileStream(fileName, FileMode.Open, myIsolatedStorage));

                sb = reader.ReadToEnd();

                reader.Close();
            }

            if(!String.IsNullOrEmpty(sb))
            {
                 MessageBox.Show(sb);
            }
        }

If this doesn't work, then maybe your file doesn't exist.