Operation not permitted on IsolatedStorageFileStream for CreateFile in isolated storage

Question

I am trying to create a file in the Isolated storage using following code,

IsolatedStorageFile storageFile = IsolatedStorageFile.GetUserStoreForApplication();
storageFile.CreateFile("Html\\index.html");

but I am getting exception while doing the same.. which says.

System.IO.IsolatedStorage.IsolatedStorageException: Operation not permitted on IsolatedStorageFileStream

There are no operation performed apart from this operation.

Hypersonic

Have you created the Html folder first? Also, are you sure the index.html file doesn't already exist? – Selenaselenate

Answer 1

You probably need to create the Html directory first. As IsolatedStorageFile.CreateDirectory() will succeed if the directory already exists, you can just do

IsolatedStorageFile storageFile = IsolatedStorageFile.GetUserStoreForApplication();
storageFile.CreateDirectory("Html");
storageFile.CreateFile("Html\\index.html");

Cadelle

I am doing a "isf.FileExists()" check before creating the file, but I am still facing the problem. I also created the Html folder before creating the file. STill getting the same exception -- An exception of type 'System.IO.IsolatedStorage.IsolatedStorageException' occurred in mscorlib.ni.dll but was not handled in user code ---- – Hypersonic

Is there anything in the InnerException of the IsolatedStorageException? – Cadelle

Answer 2

I had the same problem and it was the directory path.

This code worked to write to a file.

IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication();
    var folder = ApplicationData.Current.LocalFolder;
    string folderfilename = folder.Path + "\\" + fileName;
    try
    {
        StreamWriter writeFile = new StreamWriter(new IsolatedStorageFileStream(folderfilename, FileMode.OpenOrCreate, myIsolatedStorage));
        writeFile.WriteAsync(content);
        writeFile.Close();
    }
    catch (Exception ex)
    {
    }

Soilasoilage