Content type ordering or making it default ct

Question

The following is updated code from Ton Stegeman and it works.

 private static void AddContentType(SPWeb web, SPList spList, string ctName)
    {
        if (web.AvailableContentTypes[(ctName)] != null)
        {                
            SPContentType ContentType = web.AvailableContentTypes[ctName];
            spList.ContentTypesEnabled = true;
            spList.Update();
            spList.ContentTypes.Add(ContentType);
            spList.Update();

            SPFolder rootFolder = spList.RootFolder;
            SPContentType ct = spList.ContentTypes[ctName];
            List<SPContentType> defaultCT = new List<SPContentType>();
            defaultCT.Add(ct);
            rootFolder.UniqueContentTypeOrder=defaultCT;
            rootFolder.Update();


        }
    }

Answer 1

Here's some utility code I use to reorder content types:

private void ReorderContentTypes(SPWeb web, string listName, string firstContentTypeName)
    {
        SPList list = web.Lists[listName];

        SPContentType cType = web.AvailableContentTypes[firstContentTypeName];

        List<SPContentType> oldCTypes = new List<SPContentType>();

        for (int i = list.ContentTypes.Count -1; i >= 0; i--)
        {
            if (!list.ContentTypes[i].Id.IsChildOf(cType.Id))
            {
                oldCTypes.Add(list.ContentTypes[i]);

                list.ContentTypes[i].Delete();
            }
        }

        foreach (SPContentType c in oldCTypes)
        {
            list.ContentTypes.Add(c);
        }

        list.Update();
    }

Answer 2

You can specify the order of the content types in the SPFolder.UniqueContentTypeOrder property of the root folder (SPList.RootFolder).

http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.spfolder.uniquecontenttypeorder.aspx

Answer 3

This might be of use:

http://www.novolocus.com/2009/05/26/control-the-content-types-in-the-new-menu-via-code/

I was trying to control what was shown in the menu, but I was also defining the order (in the solution I was building), and what was in the list, and then assigning it to the UniqueContentTypeOrder.

I found that when trying to set the UniqueContentTypeOrder, you need to use SPList.ContentTypes to get the content type to set in the UniqueContentTypeOrder list, and not use one from the SPWeb.ContentTypes collection. If you use the SPWeb one I found you got an ArgumentOutOfRangeException.