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项目中 signalr 目录下创建 persistentconnection.cs 文件
using system; using system.collections.generic; using system.threading.tasks; using signalr; namespace signaltutorial.signalr { public class myconnection : persistentconnection { protected override task onconnectedasync(irequest request, string connectionid) { return connection.broadcast("connection " + connectionid + " connected"); } protected override task onreconnectedasync(irequest request, ienumerable groups, string clientid) { return connection.broadcast("client " + clientid + " re-connected"); } protected override task onreceivedasync(irequest request, string connectionid, string data) { var info = data + ". connectionid is [" + connectionid + "]"; // return connection.send(connectionid, info); // broadcast data to all clients return connection.broadcast(info); } protected override task ondisconnectasync(string connectionid) { return connection.broadcast("connection " + connectionid + " disconncted"); } protected override task onerrorasync(exception error) { return connection.broadcast("error ocurred " + error); } } }
2,推送消息由 persistentconnection 的属性 connection 来提供,它继承自 iconnection 接口,该接口提供两个函数来实现对特定客户端的推送和广播功能。
system.threading.tasks.task send(string signal, object value)
system.threading.tasks.task broadcast(object value)
为了支持客户端访问,我们将对路由表中进行配置。打开 global.asax.cs ,修改 application_start() 函数如下:
protected void application_start() { arearegistration.registerallareas(); routetable.routes.mapconnection("echo", "echo/{*operation}"); registerglobalfilters(globalfilters.filters); registerroutes(routetable.routes); // make connections wait 50s maximum for any response. after // 50s are up, trigger a timeout command and make the client reconnect. globalhost.configuration.connectiontimeout = timespan.fromseconds(50); //disconnecttimeout //heartbeatinterval //keepalive }
@model dynamic @{ viewbag.title = "title"; } <script src="@url.content("~/scripts/persistent.js")" type="text/javascript"></script> persistent chat
消息记录: (你是:@viewbag.clientname):
向 scripts 目录添加新的 javescript 脚本:persistent.js。其内容如下:
$(function () { var myclientname = $('#placeholder').val(); var connection = $.connection('/echo'); connection.received(function (data) { var msg = new string(data); var index = msg.indexof("#"); var clientname = msg.substring(0, index); var content = msg.substring(index + 1); if (clientname == null || clientname == "") { writeevent('' + "系统消息" + ': ' + content, 'event-message'); } else { writeevent('' + clientname + ' 对大家说: ' + content, 'event-message'); } }); connection.start(); $("#broadcast").click(function () { var msg = myclientname + "#" + $('#msg').val(); connection.send(msg); }); //a function to write events to the page function writeevent(eventlog, logclass) { var now = new date(); var nowstr = now.gethours() + ':' + now.getminutes() + ':' + now.getseconds(); $('#messages').prepend('' + nowstr + ' ' + eventlog + '.'); } });
1,创建连接时,指定路径为 "/echo",该路径在服务器端的路由映射表被映射为 myconnection,因而这个连接就被指向前面提供的 myconnection。
2,将 clientname 信息放入 message 中,并用 # 将 clientname 和消息内容连接成一个 msg。
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