[英]connect to signalr hub
我在控制台应用程序中创建了一个简单的SignalR集线器:
class Program
{
static void Main(string[] args)
{
using (WebApp.Start<Startup>("http://localhost:1968"))
{
Console.WriteLine("Server running!");
Console.ReadLine();
}
}
}
public static class UserHandler
{
public static HashSet<string> ConnectedIds = new HashSet<string>();
}
[HubName("echo")]
public class EchoHub : Hub
{
public void Say(string message)
{
Trace.WriteLine("hub: "+message);
Clients.All.AddMessage(message);
}
public override Task OnConnected()
{
UserHandler.ConnectedIds.Add(Context.ConnectionId);
return base.OnConnected();
}
public override Task OnDisconnected()
{
UserHandler.ConnectedIds.Remove(Context.ConnectionId);
return base.OnDisconnected();
}
}
class Startup
{
public void Configuration(IAppBuilder app)
{
app.MapSignalR();
}
}
当我尝试从Silverlight应用程序连接它时,它成功:
static Microsoft.AspNet.SignalR.Client.HubConnection signalR { get; set; }
public static Microsoft.AspNet.SignalR.Client.IHubProxy signalRhub { get; set; }
public static void StartSignalR()
{
var url = "http://localhost:1968";
signalR = new Microsoft.AspNet.SignalR.Client.HubConnection(url);
signalR.Received += signalR_Received;
signalRhub = signalR.CreateHubProxy("echo");
signalR.Start().Wait();
signalRhub.Invoke("Say", "hub invoked");
}
我的下一步是从jquery连接SignalR集线器:
<script src="../Scripts/jquery-1.6.4.js"></script>
<script src="../Scripts/jquery.signalR-2.1.0.js"></script>
<script>
$(function ()
{
var connection = $.hubConnection("http://localhost:1968");
connection.start()
.done(function () {
console.log('connected');
connection.send("success?");
})
.fail(function (a) {
console.log('not connected'+a);
});
});
</script>
当我尝试运行此脚本时,它会给出错误:
"XMLHttpRequest cannot load localhost:1968/signalr/negotiate?clientProtocol=1.4&_=1404978593482. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin <code>http://localhost:55282</code> is therefore not allowed access."
为什么我可以从Silverlight页面连接到集线器(托管在localhost:3926中)
当我运行jquery脚本(托管在localhost:55282)时失败了吗?
如何在jQuery和SignalR集线器之间建立有效连接?
更改
$(function ()
{
var connection = $.hubConnection("http://localhost:1968");
connection.start()
.done(function () {
console.log('connected');
connection.send("success?");
})
.fail(function (a) {
console.log('not connected'+a);
});
});
至
$(function ()
{
var connection = $.hubConnection("http://localhost:1968");
var hub = connection.createHubProxy("echo");
hub.on("AddMessage", Method);
connection.start({ jsonp: true })
.done(function () {
console.log('connected');
hub.say("success?");
})
.fail(function (a) {
console.log('not connected'+a);
});
});
function Method(messageFromHub)
{
alert(messageFromHub);
}
和
class Startup
{
public void Configuration(IAppBuilder app)
{
app.MapSignalR();
}
}
至
class Startup
{
public void Configuration(IAppBuilder app)
{
app.MapSignalR(new HubConfiguration() { EnableJSONP = true });}
}
应该这样做。
app.MapSignalR(new HubConfiguration() { EnableJSONP = true });}
和
connection.start({ jsonp: true })
将允许跨站点请求
使用createHubProxy()在SignalR中使用RPC on Server:
感谢Vishal Ravlani的回答
但对我来说
hub.say("success?");
不起作用! (对你起作用吗?)
我要写:
hub.invoke('say','success?');
SignalR已在客户端自动检测到CrossOrigin。
在我使用的服务器上:
app.Map("/signalr", map =>
{
map.UseCors(CorsOptions.AllowAll);
map.RunSignalR();
});
其中描述了: http : //www.asp.net/signalr/overview/signalr-20/hubs-api/hubs-api-guide-javascript-client#crossdomain
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.