从Windows Service C＃调用JavaScript函数

Question

I need to call a javascript function inside a chrome-window from a windows service written in c#.

The browser is entirely at my disposal so I can configuration is no problem.

For example, the windows service is a file checker, when a certain file is changed there has to popup a js alert.

-EDIT-

The following works fine for client to client communication (server-side code). So when a specific event happens on the server I can display this on the client (I hoped commented would do that)

using System;
using System.Threading.Tasks;
using Microsoft.AspNet.SignalR.Client;
using SignalR.Hosting.Self;
using SignalR.Hubs;

namespace Net.SignalR.SelfHost
{

    class Program
    {
        static void Main(string[] args)
        {
            string url = "http://localhost:8081/";

            var server = new Server(url);
            server.MapHubs();

            server.Start();
            Console.WriteLine("SignalR server started at " + url);


            Console.ReadLine();

           // Clients[collection].flush("bericht: " + message + collection);

        }

        //public void PushMessage(string bericht)
        //{
        //    var hubConnection = new HubConnection("http://localhost:8081/");
        //    var serverHub = hubConnection.CreateProxy("CollectionHub");

        //    serverHub.On("flush", message => System.Console.WriteLine(message));
        //    hubConnection.Start().Wait();
        //    serverHub.Invoke("Subscribe", "Product");
        //    string line = null;
        //    while ((line = bericht) != null)
        //    {
        //        serverHub.Invoke("Publish", line, "Product").Wait();
        //    }

        //    System.Console.Read();
        //}



        public class CollectionHub : Hub
        {

            public void Subscribe(string collectionName)
            {
                Groups.Add(Context.ConnectionId, collectionName);
                Console.WriteLine("Subscribed to: " + collectionName);
                //serverHub.Invoke("Publish", "dit is een eerste test", "Product").Wait();



            }

            public Task Unsubscribe(string collectionName)
            {
                return Clients[collectionName].leave(Context.ConnectionId);
            }

            public void Publish(string message, string collection)
            {
                Clients[collection].flush("bericht: " + message + collection);
            }
        }

    }
}

Answer 1

Sounds like you are describing SignalR .

What is ASP.NET SignalR?

ASP.NET SignalR is a new library for ASP.NET developers that makes it incredibly simple to add real-time web functionality to your applications. What is "real-time web" functionality? It's the ability to have your server-side code push content to the connected clients as it happens, in real-time.

You may have heard of WebSockets, a new HTML5 API that enables bi-directional communication between the browser and server. SignalR will use WebSockets under the covers when it's available, and gracefully fallback to other techniques and technologies when it isn't, while your application code stays the same.

SignalR also provides a very simple, high-level API for doing server to client RPC (call JavaScript functions in your clients' browsers from server-side .NET code) in your ASP.NET application, as well as adding useful hooks for connection management, eg connect/disconnect events, grouping connections, authorization.

What can you do with ASP.NET SignalR?

SignalR can be used to add any sort of "real-time" web functionality to your ASP.NET application. While chat is often used as an example, you can do a whole lot more. Any time a user refreshes a web page to see new data, or the page implements Ajax long polling to retrieve new data, is candidate for using SignalR.

What it basicly does, is giving you access to the client AND server side functions in both directions, a simple example of it's usage can be found on the asp.net website which will give you a good idea on how to use it and what it's capable of doing.

Answer 2

You want to be using something like signal IR to do that, its what its designed for, essentially you are describing real time functionality;

Signal IR can be found here and has a great section on javascript in its wiki

In particular you probably want to take a look at Hubs