Create an internal subfolder of a task list

Question

Hi All, I have tried the following but I receive a "cannot create folder" error. SPFolder mysubFolder= web.Folders["Lists"].SubFolders["Tasks"]; SPSecurity.RunWithElevatedPrivileges(delegate() { mysubFolder.SubFolders.Add("FolderName"); mysubFolder.Update(); });

Answer 1

Hi All, I have tried the following but I receive a "cannot create folder" error. SPFolder mysubFolder= web.Folders["Lists"].SubFolders["Tasks"]; SPSecurity.RunWithElevatedPrivileges(delegate() { mysubFolder.SubFolders.Add("FolderName"); mysubFolder.Update(); });

Answer 2

Howdy,

Make sure you written your code like below. The key thing is you need to instantiate your SPSite object inside the RunWithElevatedProivillages.

Example:

SPSecurity.RunWithElevatedPrivileges(delegate()
{

    SPWeb web = new SPSite("http://SiteURL").OpenWeb();

    using (web)
    {
        SPList list = web.GetList(web.Url + "/Lists/Tasks");
        list.Folders.Add("MyFolder", SPFileSystemObjectType.Folder);
    }
});

Thanks,

---

Gopinath Devadass - http://techblooms.com

Answer 3

Is this question connected with Visual Studio Beta 2 ?

---

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Answer 4

Dseve


I'd try it this way

SPSecurity.RunWithElevatedPrivileges(delegate()
{
   using (SPSite site = new SPSite(SPContext.Current.Site.ID) {
     using (SPWeb modifyweb = site.AllWebs[websname])
     {
    SPList tasks = modfiyweb.Lists["Tasks"];
    SPListItem newFolder = tasks.Items.Add( "", SPFileSystemObjectType.Folder, folderName);
    newFolder.Update();

     }
   }

]);


using a web reference inside a delegate that has been created outside is a bad idea. And don't forget to call Update() on the new folder.

Answer 5

Hi Markus,

That may work, but - just to add my two cents - I usually suggest to get the site ID outside the elevation block, like this:

Guid siteID = SPContext.Current.Site.ID;
or if the code runs outside of SharePoint content and you have an SPSite reference in site variable:
Guid siteID = site.ID;

and then

SPSecurity.RunWithElevatedPrivileges(delegate()
{
   using (SPSite site = new SPSite(siteID) {
     using (SPWeb modifyweb = site.AllWebs[websname])
     {
       SPList tasks = modfiyweb.Lists["Tasks"];
       SPListItem newFolder = tasks.Items.Add( "", SPFileSystemObjectType.Folder, folderName);
       newFolder.Update();
     }
   }
]);

Peter

Answer 6

Hi Peter,

I would like to ask one question to you. What is the difference between open a site by ID and URL.

Do you know any article explain about SharePoint internals archicture, I mean what is internaly happening when we instantiate a SPSite object.


Thanks,

---

Gopinath Devadass - http://techblooms.com

Answer 7

Thanks is just fantastic guys. I actually learning something new. Do you think I can extend that to create a subfolder to the Attachment subfolder of the task list? Thanks

Answer 8

Hi Markus,

That may work, but - just to add my two cents - I usually suggest to get the site ID outside the elevation block, like this:

Guid siteID = SPContext.Current.Site.ID;
or if the code runs outside of SharePoint content and you have an SPSite reference in site variable:
Guid siteID = site.ID;



Peter

OK, Peter, I have to admit that I was lazy ;o)

using SPContent.Current.User inside the delegate is very, very dangerous as this context has bben changed but not so with the Site.ID.

But you are in danger of getting used to a bad habit (using SPContext inside the delegate), so I'm 100% with you.

Answer 9

Hi dioulos,

"Do you think I can extend that to create a subfolder to the Attachment subfolder of the task list?"
I don't recommend that. AFAIK the folder for the Attachment is NOT an SPFolder. It is a "real" folder. SPFolder is basically a list item having the specific Folder content type (or derived from that content type). For example, you won't get attachement folders when calling SPList.RootFolder.Folders on a list instance.

Why would you need that?

Gopinath,

I think there is not too much difference, but you can check it using Reflector. I'm sure that approach is better than any articles you can find on the web. I've started to look that, but there is a lot of calls between different constructor overloads and some obfuscated code as well. I may have time to play with that later...

Generally I use the constructor that accepts the URL as we usually knows the URL, but I think that might consume a bit more resource, as the URL must be first resolved to the Guid. It is usually not an issue, but you might have problems with that if you have alternate access mappings enabled, and call the constructor with a non-AAM URL.
See comment from Rodney Viana (MSFT) at http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.spsite.aspx

Peter

Answer 10

My real issue is that I am developing a WF (Windows Workflow) which create a Task (A). Then the user can edit that task (A) and attach a file to it and then submit. All the relevant metadata (like title, assignto, etc) would be use to create another task (B) with the attachment. However the issue is that the offered visual element (CreateTask Activity) does not create the task until it dehydrate (i.e the next activity is an OnChangeTask activity, a delay/OnTaskCreated) and thus I cannot attach a files on a task that does not exist yet! By playing around ,with the sharepoint designer, I notice that you can create a folder with the item id as its name and it will somehow associate the task to the folder. The Delay and OnTaskCreate activity have has bug and does not work correctly that why I cannot used them. So my only solution is to create the attachment folder myself, hence the question. I will put the code into a Code Activity.

Answer 11

Hi,

   Merge as the same thread.

Best Regards,
-Aaron