C#客户端到客户端消息传递 [英] C# Client to Client Messaging

问题描述

我将尽力解释我首先要实现的目标.

I will try and explain exactly what I want to achieve first.

想象有两个用户正在使用Windows窗体应用程序，当用户A打开一个特定的窗体时，会将锁应用于该窗体下的数据记录，以便当时只有该用户可以进行更改.

Imagine two users are using a windows forms application, when User A opens a particular form a lock is applied to the data record underlying the form so that only that user can make changes at that time.

用户B具有所有记录的列表(在网格中)，其中包括对用户A已打开的记录的引用.我们要做的是在用户A打开记录时更新用户B的记录列表在该行旁边显示一个锁定图标，以指示该记录正在使用中.

User B has a list of all records (in a grid) which among others contains a reference to the record already opened by User A. What we want to do is when User A opens the records User B's list of records is updated to show a lock icon next to the row to indicate the record is in use.

这是我们处理消息传递的一个简单例子，但是您知道了，用户A做了用户B需要了解的事情.

This is a trivial example of what we do with messaging but you get the idea, User A does something User B needs to knows about it.

我已经使用C#和OpenFire Jabber服务器的Jabber-net实现了一个系统.基本上，当要发送消息时，将在数据库的消息表中插入新行.服务客户端使用SqlDependancy对象监视messages表，以便在准备好新消息时，服务会构建相关消息，并通过Jabber和OpenFire服务器将其发送到所需的客户端.

I have implemented a system using Jabber-net for C# and an OpenFire Jabber Server. Basically when a message is to be sent, a new row gets inserted on a messages table in the database. The messages table is watched by a service client using the SqlDependancy object, so that when a new message is ready the service builds the relevant message and sends it to the desired client via Jabber and the OpenFire server.

这可以正常工作，但是OpenFire的开箱即用功能是为了支持即时消息传递，这显然不是我要实现的目标.我遇到的问题是，如果用户登录到两个应用程序上下文(即测试和实时)，则OpenFire不知道将消息发送给哪个应用程序上下文，因为user @ server/resource的JID结构不会注意到该资源.

This works OK, however OpenFire's out of the box functionality is for supporting Instant Messaging which obviously isn't what I'm trying to achieve . The problem I have is that if a user is logged in to two Application Contexts (i.e. Test and Live) OpenFire does not know which one to send a message to because the JID structure of user@server/resource takes no notice of the resource.

基本上，我目前使用OpenFire和Jabber-net的方式不太正确.

Basically the way I'm currently using OpenFire and Jabber-net isn't quite right.

是否有一种模式可以用来实现我想要实现的目标，即向客户端发送一条消息，告诉它执行某项操作，同时还可以指定您也向哪个客户端发送消息. XMPP似乎是答案，因为我可以构造自己的要解析的消息类型.

Is there a pattern I can use for achieving what I want to achieve i.e. send a message to a client telling it do something, whilst being able to specify which client you are sending the message too. XMPP seemed like the answer because I can construct my own messages types to be parsed.

我的应用程序是Windows Forms .NET 3.5 C#应用程序.

My application is a Windows Forms, .NET 3.5 C# application.

推荐答案

我将添加更多数据以指示受影响的应用程序上下文，并让其他客户端决定是否需要处理消息.

I'd just add some more data to indicate which Application Context is affected and have the other clients decide whether they need to handle the message or not.

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