Check folder

判断文件夹是否存在

 public bool FolderExists(string library, string name) {

        using (var ctx = new ClientContext("http://sp2013")) {

            List sharedDocs = ctx.Web.Lists.GetByTitle(library);

            var query = ctx.LoadQuery(sharedDocs.RootFolder.Folders.Where(fd => fd.Name == name));

            ctx.ExecuteQuery();

            Folder f = query.SingleOrDefault();

            return f != null;

        }

    }