我正在使用SignalR 2.0制作一个小型聊天应用程序（就像每个人一样）。
我有一个win8.1应用程序，当应用程序关闭时，hub会接收到OnDisconnected事件并从列表中删除用户。 Hub向每个客户端发送用户已离开聊天室的消息，以便我们可以看到用户已经离开。
但是当我在网页中使用SignalR和Javascript时，如果页面被关闭，hub不会被通知到标签/浏览器已关闭...
有没有任何想法如何关闭连接？
我的代码如下：
启动Hub
我有一个win8.1应用程序，当应用程序关闭时，hub会接收到OnDisconnected事件并从列表中删除用户。 Hub向每个客户端发送用户已离开聊天室的消息，以便我们可以看到用户已经离开。
但是当我在网页中使用SignalR和Javascript时，如果页面被关闭，hub不会被通知到标签/浏览器已关闭...
有没有任何想法如何关闭连接？
我的代码如下：
启动Hub
[assembly: OwinStartup(typeof(ChatServer.Startup))]
namespace ChatServer
{
public class Startup
{
public void Configuration(IAppBuilder app)
{
// Map all hubs to "/signalr"
app.MapSignalR();
}
}
}
集线器
[HubName("ChatHub")]
public class ChatHub : Hub
{
private static List<User> Users = new List<User>();
public void Send(string name, string message)
{
// Call the broadcastMessage method to update clients.
Clients.All.broadcastMessage(name, message, DateTime.Now);
}
public void UserConnected(string name)
{
Clients.Caller.connected(JsonConvert.SerializeObject(Users));
User user = new User() { Name = name, ConnectionID = Context.ConnectionId };
Clients.Others.userConnected(JsonConvert.SerializeObject(user));
Users.Add(user);
}
public void UserLeft()
{
if(Users.Any(x=>x.ConnectionID == Context.ConnectionId))
{
User user = Users.First(x => x.ConnectionID == Context.ConnectionId);
Users.Remove(user);
Clients.Others.userLeft(JsonConvert.SerializeObject(user), Context.ConnectionId);
}
}
public override System.Threading.Tasks.Task OnDisconnected()
{
// Only called when win8.1 app closes
// Not called when browsers closes page
UserLeft();
return base.OnDisconnected();
}
}
HTML - JavaScript：
JavaScript：
chat = new function () {
var ChatHub;
// Connecting to the hub
this.attachEvents = function () {
if ($.connection != null) {
ChatHub = $.connection.ChatHub;
$.connection.hub.start({ transport: 'auto' }, function () {
// Register client on hub
ChatHub.server.userConnected("web name");
});
}
this.send = function (name,message) {
if ($.connection != null) {
//Send chat message
ChatHub.server.send(name, message).fail(function (e) {
alert(e);
});
}
}
}
};
window.onbeforeunload = function (e) {
//This is called when we close the page
$.connection.hub.stop();
return "You killed me! :'(";
};
Win8.1客户端
internal async void ConnectToHub(string userName)
{
try
{
HubConnection hubConnection = new HubConnection(SERVER_PROXY);
chat = hubConnection.CreateHubProxy("ChatHub");
Context = SynchronizationContext.Current;
MakeHubFunctionsAvailableOnClient();
await hubConnection.Start();
// Register client on hub
await chat.Invoke("UserConnected", userName);
}
catch (Exception)
{
throw;
}
}
private void MakeHubFunctionsAvailableOnClient()
{
//Receive chat messages
chat.On<string, string, DateTime>("broadcastMessage",
(name, message, date) => Context.Post(
delegate {
Messages.Add(new UserMessage() { Message = message, User = name, Date = date });
}, null
)
);
//Receive all online users
chat.On<string>("connected",
(users) => Context.Post(
delegate
{
List<User> userList = JsonConvert.DeserializeObject<List<User>>(users);
foreach (User user in userList)
{
Users.Add(user);
}
Messages.Add(new UserMessage() { Message = "CONNECTED", User = "System", Date = DateTime.Now });
}, null
)
);
//New user connected
chat.On<string>("userConnected",
(user) => Context.Post(
delegate
{
User newUser = JsonConvert.DeserializeObject<User>(user);
Users.Add(newUser);
Messages.Add(new UserMessage() { Message = newUser.Name + " CONNECTED", User = "System", Date = DateTime.Now });
}, null
)
);
//User left, remove user from list on client
chat.On<string>("userLeft",
(user) => Context.Post(
delegate
{
User newUser = JsonConvert.DeserializeObject<User>(user);
User y = Users.First(x=>x.ConnectionID == newUser.ConnectionID);
bool ux = Users.Remove(y);
Messages.Add(new UserMessage() { Message = newUser.Name + " left the conversation", User = "System", Date = DateTime.Now });
}, null
)
);
}
当我关闭标签/浏览器/导航到其他网站时，我的中心不会触发OnDisconnected事件。
我使用的浏览器是什么？
Chrome：版本32.0.1700.68 beta-m
Internet Explorer 11