The documentation for FileName should help.它说：

FileName: The name of the client’s file,including the directory path.

在以下代码中,postingFile.FileName将根据浏览器而有所不同.因此,始终只提取文件名很重要,您也可能会很幸运并获得clientPath.

public ActionResult UploadFile(HttpPostedFile postedFile) {
    var clientPath = IO.Path.GetDirectoryName(postedFile.FileName);
    var filename = IO.Path.GetFileName(postedFile.FileName);
    ... Save the file,etc ...
}