In DNN 7, I set up a SharePoint Online folder provider. I set the read-only option in the provider settings.

When I try to add a folder using this provider, I get the message in the dnn log:

DotNetNuke.Services.FileSystem.FolderProviderException: The underlying system threw an exception. The folder has not been added. ---> System.IO.IOException: The connection is read only

Why is this? I thought it was read-only on the SharePoint side only. Seems like it thinks the DNN folder system is read-only.

If I uncheck the read-only option on the provider, I can created the folder. But I don't want anything to be written to SharePoint. If I set the provider back to read-only the new folder disappears.

How can I get this to work?

I little more info:

When I have read-only unchecked, it looks like it tries to sync with SharePoint, but in the log file I get a bunch of messages like:

2016-02-28 19:50:17,071 [SchlarMaxW7x64][Thread:49][ERROR] DotNetNuke.Services.FileSystem.FolderManager - System.NotSupportedException: Specified method is not supported.
at Microsoft.SharePoint.Client.ClientQueryable`1.GetEnumerator()
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at Intelequia.DNNDrive.SharepointOnlineFolderProvider.GetFiles(IFolderInfo folder)
at DotNetNuke.Services.FileSystem.FolderManager.SynchronizeFiles(MergedTreeItem item, Int32 portalId)

First of all, sorry for the delay in this response.

Following your question, we have made a number of improvements in the module so that from now Read Only mode allows the creation of the root folder, but being at this way the creation of any other file or folder will be locked.

We have also solved this last mentioned issue in loading the folders without Read Only mode enabled.

To apply these changes you just download the new version 3.00.08 DNNDrive in our download section and install in your portal.