According to batch download file Url, via the Url. GetContentLength back length is around 6000, batch download are more than tens of thousands of other length.
The front desk before download package of length 6000 PDF files byte 0, for tens of thousands of other length, all can normal open, also no error, can run normally, pass by the bosses to give directions, very try so hard, the problems for a long time, ask for help! For help! For help!