How to monitor postgresql database table for any changes via c#

Question

I have a windows service running which reads configurations from a table from PostgreSQL. These settings are read only once at the time of service startup and for any change in them, the service needs to be restarted. I am looking for a mechanism in C# to monitor any changes on database. So that I would then fetch back the settings on database change.

One approach I was looking for, is to write/modify a text file from PostgreSQL trigger and then use FileWatcher to update the settings. But no success there either.

Answer 1

First, I created a perpetual listening connection with command listen <channel_name> by referring npgsql documentation

Then I wrote a trigger that would fire command

PERFORM pg_notify('<channel_name>', format('Changed: %s ', NEW.column_name));

So any change on the particular database's table was captured by the trigger, which in turn sent the notification to the channel and the c# code listened and processed it