.net MVC前后端通信—SingleR,文件监控FileSystemWatcher

在这里介绍一个通过文件监视FileSystemWatcher和SingleR实现对文件的监控提示。

1、首先利用Nuget安装SingleR，

2、安装完SingleR之后，在项目中会多出来SingleR的dll文件和两个JS文件

3、修改Startup类，（若项目中没有Startup类，通过搜索Startup添加）

4、添加chatHub类：

public class ChatHub : Hub    {        private string filePath = AppDomain.CurrentDomain.BaseDirectory;        /// <summary>        /// 发送信息给所有用户        /// </summary>        /// <param name="message"></param>        public void Hello(string message)        {            Clients.All.hello(message);        }        public void watcherTxt()        {            WatcherStrat(filePath, "file.txt");        }        private void WatcherStrat(string path, string filter)//监控文件        {            FileSystemWatcher watcher = new FileSystemWatcher();            watcher.Path = path;            watcher.Filter = filter;            watcher.Changed += new FileSystemEventHandler(OnProcess);            watcher.Created += new FileSystemEventHandler(OnProcess);            watcher.Deleted += new FileSystemEventHandler(OnProcess);            watcher.Renamed += new RenamedEventHandler(OnRenamed);            watcher.EnableRaisingEvents = true;            watcher.NotifyFilter = NotifyFilters.Attributes | NotifyFilters.CreationTime | NotifyFilters.DirectoryName | NotifyFilters.FileName | NotifyFilters.LastAccess                                   | NotifyFilters.LastWrite | NotifyFilters.Security | NotifyFilters.Size;            watcher.IncludeSubdirectories = true;        }        public void OnProcess(object source, FileSystemEventArgs e)        {            if (e.ChangeType == WatcherChangeTypes.Created)            {                                Clients.All.hello("Created");            }            else if (e.ChangeType == WatcherChangeTypes.Changed)            {                Clients.All.hello("Changed");             }            else if (e.ChangeType == WatcherChangeTypes.Deleted)            {Clients.All.hello("Deleted");  } } private void OnRenamed(object source, RenamedEventArgs e) {Clients.All.hello("Renamed");  }}

5、修改view页面，实现前后交互：

<script src="~/Scripts/jquery.signalR-2.2.2.min.js"></script>      <script src="~/signalr/js"></script>            $(function () {                //创建一个hub服务                var hub = $.connection.chatHub;                $.connection.hub.start()                    .done(function () {                        hub.server.watcherTxt();//进入后台方法                    })                    .fail(function () {                        alert("连接失败!");                    });                hub.client.hello = function (name) {//前台hello方法                    alert(name);                };                $("#sayHello").click(function () {                    hub.server.hello("Jack");//向后台发送数据                })            });