如果应用程序在c＃winforms中意外关闭，则更新数据库

Question

I am developing desktop based winform in c#. The application may closed unexpectedly (power failure or debug mode off). In any closing condition i need to update my database . ie I need to change the online status from 1 to 0 how to do this?

Answer 1

The best way to know whether an application has died is not to try to think of a way to update the database when the application closes; but rather, you could create a "session" record whenever the application is opened; then "ping" the record (ie there's a LastPingUTC column) every minute.

If the application closes for whatever reason, the LastPingUTC value will be over 1 minute ago and therefore you can assume the application / session is dead.

Actually, I'd assume a given session is dead after 5 minutes as updating a column may be delayed.