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.

Have you created the `Html` folder first? Also, are you sure the `index.html` file doesn't already exist? — Kevin Gosse, Dec 12 '12 at 14:08

score 3 · Answer 1 · answered Dec 12 '12 at 15:23

3

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");

answered Dec 12 '12 at 15:23

gregstoll

1,318
9
14

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 ---- – user1893772 Dec 13 '12 at 06:58
Is there anything in the InnerException of the IsolatedStorageException? – gregstoll Dec 14 '12 at 01:29

score 1 · Answer 2 · answered Jun 04 '13 at 20:15

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)
    {
    }

Operation not permitted on IsolatedStorageFileStream for CreateFile in isolated storage

2 Answers2