如何通知客户列表已被修改

Question

I need answer for following question, suppose the application is ASP.NET application or WPF application.

you have two screens live on two different machines one having an employee list and one having add employee screen what can be done when employee gets added the screen displaying the employee list gets a message that an employee has been added.

Please advise,

Answer 1

ASP.NET server can't notify client about changes. You have to use some external library like SignalR (http://signalr.net/) to force client to remain in connection with server permanently and to make a possibility to notify clients about changes.

Answer 2

如果使用ObservableCollection ，则可以侦听CollectionChanged事件并检查参数是否已添加项目。

Answer 3

You can use WCF service to mediate between clients. When employee gets added first client send information to service. Then WCF service send callback to second client. See WCF callbacks