如何在计算机重新启动后保持 Windows 服务运行？

Question

I have this Windows Service (using SqlDependency ) that sends me an e-mail everytime it is started and everytime a new row is inserted on my Sales table (the database has Service Broker enabled). I also write a log file to register when the service is started, the data is inserted to the table, if the e-mail was successfully sent and when the service is stoped.

• When I started the service manually, it worked just fine.
• Then I turned my PC off and on again and inserted data on my table in the database, but nothing happened (no e-mail sent and no register in my log file).
• I restarted the service manually and it worked fine again.
• Turned the PC off and on again and nothing heppened again.
• I made some research and changed the initialization type to Automatic and tried again. And nothing happened again.
• I changed the initialization type to Automatic Delayed and tried again. But it didn't work too, even 1 hour after I turned the PC on.
• Now I manually restarted the service and the log file registered that the service stoped and started, I received the email that the service started and, after I inserted data in my database table, both log register and email message worked just fine.

Everytime it didn't work, I checked the services manager in Windows and it was marked as "Running".

I don't know if I need to configure something different in my code or in my service properties. Has anybody ever had this issue?

EDIT

I modified my service and included a timer, so every minute passed it writes the time in my log text file. After I restarted my PC, the log file continued to register the time every minute, but did not register the insert I made in my database table.

My guess is that the service might be losing the database connection when the PC is restarted, so the SqlDependency cannot detect the changes. Does it make any sense?

Answer 1

Your service depends on SQL Server, but your service is probably starting before SQL Server has been started, or finished starting. This may be causing your SqlDependency to fail.

You can mark your service as being dependent on SQL Server, which means:

• Windows won't attempt to start your service until SQL Server has started and is ready, and
• Starting your service will cause Windows to start SQL Server before it starts your service

This can be achieved on the command-line with the sc command (which will need to be run at an administrative command prompt). If your SQL Server instance is named MSSQLSERVER and your service is named MyService the command would look like this:

sc config MyService depend= MSSQLSERVER

Note: The space after = and before MSSQLSERVER matters. The detailed syntax can be found on docs.microsoft.com .

Once this command has run successfully, this is what you'll see when looking at the properties of your service in Control Panel > Administrative Tools > Services: