问题
I am building a multiuser WPF application (requirement is a desktop app), database SQL Server 2008.
There are two types of users.
The first type user will enter a record which would be stored in a table.
The second type user initially will be presented with a listbox with the records from the table. The requirement is that the listbox must be updated live (i.e. if a new record is entered by the first user the listbox must be updated).
Currently I have not yet implemented the Database functionality. I am currently working with ObservableCollection and simulating this scenario.
I would like to know the best approach for achieving this. Should i use a timer and keep querying the table? Is there a more efficient way? Is this even possible (should I switch to ASP.NET?) ?
I would appreciate any suggestions and tips that you may have.
回答1:
Try using SqlDependency, since it can raise an event (OnChange) in your code when the results of a query would change on the server (as the result of an INSERT or UPDATE from another user or process, for example)
An example of its use on CodeProject for a simple live chat application:
http://www.codeproject.com/KB/database/chatter.aspx
来源：https://stackoverflow.com/questions/5009036/wpf-live-update-from-database