.Net新建Sharepoint文件夹方法

public static void AddSharepointFolder(ClientContext clientContext, string NewFolderName)
        {
            try
            {
                Web web = clientContext.Site.RootWeb;
                clientContext.Load(web);
                clientContext.Load(web.Lists);
                clientContext.Load(web, wb => wb.ServerRelativeUrl);
                clientContext.ExecuteQuery();

                List list = clientContext.Site.RootWeb.GetListByTitle(SPBackListName);
                clientContext.Load(list);
                clientContext.ExecuteQuery();

                Folder folder = null;
                if (SPBackListFolderName == "")
                {
                    folder = web.GetFolderByServerRelativeUrl(web.ServerRelativeUrl + "/" + SPBackListWebName + "/");
                }
                else
                {
                    folder = web.GetFolderByServerRelativeUrl(web.ServerRelativeUrl + "/" + SPBackListWebName + "/" + SPBackListFolderName + "/");
                }

                clientContext.Load(folder);
                clientContext.ExecuteQuery();

                if (folder != null)
                {
                    ListItemCreationInformation creation = new ListItemCreationInformation();
                    creation.FolderUrl = folder.ServerRelativeUrl;
                    creation.UnderlyingObjectType = FileSystemObjectType.Folder;
                    creation.LeafName = NewFolderName;

                    ListItem SubFolder = list.AddItem(creation);
                    SubFolder.Update();

                    clientContext.ExecuteQuery();
                }
            }
            catch (Exception ex)
            {

            }
        }

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