C# 服务器和客户端应用程序之间的推送通知机制
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Push Notification mechanism between a server and a client app
提问by Tolga Evcimen
I am developping a desktop application using C#, which communicates with a server over a WCF Web Service. It is supposed to be a kind of synchronization application. Meaning that when I make some changes on client app I should immediately update the server too(this is easy using service calls), but also this mechanism should be provided vice versa, a change on server must immediately be applied on several clients. I know I can make polling to my server but this doesn't look neat to me, and also I've heard of duplex services, but I'm not sure if I can use it to implement this mechanism.
我正在使用 C# 开发桌面应用程序，它通过 WCF Web 服务与服务器进行通信。它应该是一种同步应用程序。这意味着当我对客户端应用程序进行一些更改时，我也应该立即更新服务器（这很容易使用服务调用），但也应该提供这种机制，反之亦然，服务器上的更改必须立即应用于多个客户端。我知道我可以对我的服务器进行轮询，但这对我来说并不整洁，而且我也听说过双工服务，但我不确定是否可以使用它来实现这种机制。
I am asking for some suggestions over this issue. Thanks in advance.
我正在就这个问题征求一些建议。提前致谢。
采纳答案by Brice2Paris
You need to implement a publish and subscribe design. In WCF you could use net-tcp protocol to connect in duplex clients and server.
您需要实现发布和订阅设计。在 WCF 中，您可以使用 net-tcp 协议连接双工客户端和服务器。
You could download a quite good implementation on http://www.idesign.net/Downloads/GetDownload/2032
你可以在http://www.idesign.net/Downloads/GetDownload/2032上下载一个很好的实现
And you will find a good article here.
你会在这里找到一篇好文章。
Regards
问候
回答by Serkan Polat
tolga, you can use winforms with signalR, server side can be asp.net or a standalone windows application..
tolga，你可以使用带有signalR的winforms，服务器端可以是asp.net或一个独立的windows应用程序..
回答by marifrahman
回答by Nitin Suryawanshi
var webAddr = "https://fcm.googleapis.com/fcm/send";
var httpWebRequest = (HttpWebRequest)WebRequest.Create(webAddr);
httpWebRequest.ContentType = "application/json";
httpWebRequest.Headers.Add("Authorization:key=YOUR_SERVER_KEY");
httpWebRequest.Method = "POST";
using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
string json = "{\"to\": \"/topics/news\",\"notification\": {\"body\": \"New news added in application!\",\"title\":\"" + Your_Notif_Title+ "\",}}";
streamWriter.Write(json);
streamWriter.Flush();
}
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
{
result = streamReader.ReadToEnd();
}
