It's quite like this question. But there is a little bit difference.

In my situation, all files and folders in the Desktop were disappeared. And when I right clicked on the desktop, the drop-down box didn't appear. Whatever operation I did, nothing happened.

But when I opened the home folder, and access the desktop folder from it, files and folders were there. And I could operate the files as usual.

So I wonder how to get my files and folders back to the Desktop.