ASP。使用Web服务进行实时更新

I'm trying to find examples on how to get real time updates using a web service in ASP.NET MVC (Version doesn't matter) and posting it back to a specific user's browser window.

我正在寻找如何使用ASP中的web服务获得实时更新的示例。NET MVC(版本无关紧要)并将其发布到特定用户的浏览器窗口。

A perfect example would be a type of chat system like that of facebooks' where responses are send to the appropriate browser(client) whenever a message has been posted instead of creating a javascript timer on the page that checks for new messages every 5 seconds. I've heard tons of times about types of sync programs out there, but i'm looking for this in code, not using a third party software.

一个完美的例子是类似于facebooks的聊天系统，每当消息被发布时，响应就被发送到适当的浏览器(客户端)，而不是在页面上创建一个javascript计时器，每5秒检查一次新消息。我已经听过很多次关于同步程序的类型，但是我在代码中寻找，而不是使用第三方软件。

What i'm looking to do specifically:

我特别想做的是:

I'm trying to create a web browser chat client that is SQL and Web Service based in ASP.NET MVC. When you have 2-4 different usernames logged into the system they chat and send messages to each other that is saved in an SQL database, then when there has been a new entry (or someone sent a new message) the Web Service see's this change and then shows the receiving user the new updated message. E.G Full Chat Synced Chat using a Web Service.

我正在尝试创建一个web浏览器聊天客户机，它是基于ASP的SQL和web服务。净MVC。有2 - 4不同的用户名登录到系统时他们互相聊天和发送消息,保存在一个SQL数据库,当有一个新条目(或某人发送新消息)Web服务看到这种变化,然后展示了新的更新消息接收用户。E。使用Web服务进行同步聊天。

The thing that really stomps me in general is I have no idea how to detect if something new is added to an SQL table, and also I have no idea how to send information from SQL to a specific user's web browser. So if there are people userA, userB, userC all on the website, i don't know how to only show a message to userC if they are all under the username "guest". I would love to know hot to do this feature not only for what i'm trying to create now, but for future projects as well.

我通常不知道如何检测SQL表中是否添加了新内容，也不知道如何从SQL发送信息到特定用户的web浏览器。如果网站上有用户userA userB userC，我不知道如何只显示一条消息给userC如果他们都在"guest"下。我很想知道hot做这个功能不仅是为了我现在正在尝试的，也是为了将来的项目。

Can anyone point me into the right direction please? I know SQL pretty well, and web services i'm intermediate with.

谁能告诉我正确的方向吗?我对SQL非常了解，对web服务也很了解。

1 个解决方案

#1

You can use SignalR for this task.

您可以使用SignalR执行此任务。

Via Scott Hanselman:

通过Scott Hanselman:

Create Asp.net mvc empty application

创建Asp.net mvc空白应用程序。
install nuget package of SignalR

安装SignalR的nuget包。
Add new Controller (as example HomeController):

添加新控制器(例如HomeController):

public class HomeController : Controller { public ActionResult Index() { return View(); } }

公共类HomeController:控制器{public ActionResult Index() {return View();} }

Create view Index with javascript references: @Url.Content("~/Scripts/jquery-1.6.4.min.js")" "@Url.Content("~/Scripts/jquery.signalR.js")" and function:

使用javascript引用创建视图索引:@Url.Content(“~/Scripts/jquery-1.6.4.min.js”)“.content”(“~ /脚本/ jquery.signalR.js”)和功能:

$(function () {
    var hub = $.connection.chatHub;
    hub.AddMessage = function (msg) {
        $('#messages').append('<li>' + msg + '</li>');
    };
    $.connection.hub.start().done(function() {
        $('#send').click(function() {
            hub.send($('#msg').val());
        });
    });
});

Create class ChatHub:

创建类ChatHub:

public class ChatHub:Hub { public void Send(string message) { Clients.AddMessage(message); } }

公共类ChatHub:Hub {public void Send(string message) {client . addmessage (message);} }

#1