c # get and post requests (b) At present only data

Logical data file download

https://www.cnblogs.com/zjbky/p/5026477.html

Analog http get request transmission or post

https://www.cnblogs.com/xssxss/archive/2012/07/03/2574554.html

Information received files

https://www.cnblogs.com/y114113/p/7785033.html