Wcf - using duplex - callbacks

Question

我正在使用 mvvm 设计模式创建一个带有 wpf 客户端的 wcf 项目，我需要在哪里实现 ICallback 接口以便我能够更新窗口。

Answer 1

The callback contract should be implemented on the client-side. Likewise, the service contract should be implemented on the server-side, with which the server can send data to the client-side by the callback contract.
Please refer to my example of the previous post.
TimeOut exception in WCF while implementing duplex
the client sends a parameter to the server by using the service interface, subsequently, the server sends the handled result to the client with the callback contract so that the client application gets the updated.
Feel free to let me know if there is anything I can help with.