在表格插入时显示Windows气球提示

Question

I am developing a windows application using C# . I want to show a balloon notification when a new row is inserted into a specific table. The application will be installed on many computers and will share a common database through LAN. Currently I am achieving this using polling. That is the application will query the database table each second to check if a new row is inserted.Please let me know whether this is the correct method or is there a better method for this? I know that using trigger we can execute queries in SQL server for table inserts, but is it possible to send a message back to the particular application from SQL server that has inserted the new row into the table? Please help

Answer 1

I think you can accomplish this with a combination of a SQL CLR Trigger and a Win32 API Function. Using the CLR Trigger will help avoid polling.

Here's an MSDN article on writing the CLR Trigger.

The sample code shown is logging to some audit table. Swap that part to make a call to the Shell_NotifyIcon Win32 API function. Here's a sample from MSDN on using the Shell_NotifyIcon to display the balloon notification.

The actual sample code is on this page (search for notificationicon.zip) and written in C++, but you should be able to modify it for C# once you do the DLL Import and use PInvoke. See this SO thread for more on that.