Question

I want to create a file, save data and then append some information to it (ex. the next time app will be started). I’m using this code:

       IsolatedStorageFile myStore = IsolatedStorageFile.GetUserStoreForApplication();
       using (var isoFileStream = new IsolatedStorageFileStream("history.dat", FileMode.Append, FileAccess.Write, myStore))
       {
            //Write the data
            using (var isoFileWriter = new StreamWriter(isoFileStream))
            {
                isoFileWriter.WriteLine(m.Author + "|" + m.Receiver + "|" + m.Text + "|" + m.Date + "\r\n");
            }
       }

But it doesn’t work :/ Only first line is saved – anything I want to add to the created file is going to nowhere o_O I also tried this approach:

            using (var isoFileStream = new IsolatedStorageFileStream("history.dat", FileMode.Open, myStore))
            {
                // Read the data.
                using (var isoFileReader = new StreamReader(isoFileStream))
                {
                    data = isoFileReader.ReadLine();
                }
            }

To verify the file I have used another class and IsoStoreSpy application.
Please help.

Answer 1

Appending works fine using your code. But for reading all lines you have to iterate them, otherwise you read just the first line:

while (!isoFileReader.EndOfStream)
{
    string line = isoFileReader.ReadLine();
    System.Diagnostics.Debug.WriteLine(line);
}

Tested and works. And you don’t need to append the new line (“\r\n”) when writing a line. WriteLine will do this for you.