我需要获取客户端的连接ID。我知道您可以使用$.connection.hub.id
从客户端获得它。我需要的是在web服务中使用它来更新数据库中的记录,然后在网页上显示更新。我是signalR和stackoverflow的新手,因此任何建议都将不胜感激。在我的客户端网页上,我有以下内容:
<script type="text/javascript">
$(function () {
// Declare a proxy to reference the hub.
var notify = $.connection.notificationHub;
// Create a function that the hub can call to broadcast messages.
notify.client.broadcastMessage = function (message) {
var encodedMsg = $('<div />').text(message).html();// Html encode display message.
$('#notificationMessageDisplay').append(encodedMsg);// Add the message to the page.
};//end broadcastMessage
// Start the connection.
$.connection.hub.start().done(function () {
$('#btnUpdate').click(function () {
//call showNotification method on hub
notify.server.showNotification($.connection.hub.id, "TEST status");
});
});
});//End Main function
</script>
一切正常,直到我想使用signalR更新页面。在我的集线器中显示通知函数如下:
//hub function
public void showNotification(string connectionId, string newStatus){
IHubContext context = GlobalHost.ConnectionManager.GetHubContext<notificationHub>();
string connection = "Your connection ID is : " + connectionId;//display for testing
string statusUpdate = "The current status of your request is: " + newStatus;//to be displayed
//for testing, you can display the connectionId in the broadcast message
context.Clients.Client(connectionId).broadcastMessage(connection + " " + statusUpdate);
}//end show notification
如何将connectionid发送到我的web服务?
希望我不是在尝试做一些不可能的事情。提前谢谢。
发布于 2019-08-08 17:23:03
泰勒的答案是有效的,然而,它没有考虑到这样一种情况,即用户打开了多个web浏览器标签,因此具有多个不同的连接ID。
为了解决这个问题,我创建了一个并发字典,其中字典键是用户名,每个键的值是该给定用户的当前连接列表。
public static ConcurrentDictionary<string, List<string>> ConnectedUsers = new ConcurrentDictionary<string, List<string>>();
在已连接时-将连接添加到全局缓存字典:
public override Task OnConnected()
{
Trace.TraceInformation("MapHub started. ID: {0}", Context.ConnectionId);
var userName = "testUserName1"; // or get it from Context.User.Identity.Name;
// Try to get a List of existing user connections from the cache
List<string> existingUserConnectionIds;
ConnectedUsers.TryGetValue(userName, out existingUserConnectionIds);
// happens on the very first connection from the user
if(existingUserConnectionIds == null)
{
existingUserConnectionIds = new List<string>();
}
// First add to a List of existing user connections (i.e. multiple web browser tabs)
existingUserConnectionIds.Add(Context.ConnectionId);
// Add to the global dictionary of connected users
ConnectedUsers.TryAdd(userName, existingUserConnectionIds);
return base.OnConnected();
}
断开连接(关闭选项卡)时-从全局缓存字典中删除连接:
public override Task OnDisconnected(bool stopCalled)
{
var userName = Context.User.Identity.Name;
List<string> existingUserConnectionIds;
ConnectedUsers.TryGetValue(userName, out existingUserConnectionIds);
// remove the connection id from the List
existingUserConnectionIds.Remove(Context.ConnectionId);
// If there are no connection ids in the List, delete the user from the global cache (ConnectedUsers).
if(existingUserConnectionIds.Count == 0)
{
// if there are no connections for the user,
// just delete the userName key from the ConnectedUsers concurent dictionary
List<string> garbage; // to be collected by the Garbage Collector
ConnectedUsers.TryRemove(userName, out garbage);
}
return base.OnDisconnected(stopCalled);
}
发布于 2014-01-04 02:42:42
当客户端调用服务器端的函数时,您可以通过Context.ConnectionId
检索它们的连接ID。现在,如果您希望通过集线器外部的机制访问该连接Id,您可以:
OnConnected
中添加字典并在OnDisconnected
中从字典中删除来管理连接的客户端列表,也就是public static ConcurrentDictionary<string, MyUserType>...
。一旦你有了用户列表,你就可以通过你的外部机制来查询它。例1:
public class MyHub : Hub
{
public void AHubMethod(string message)
{
MyExternalSingleton.InvokeAMethod(Context.ConnectionId); // Send the current clients connection id to your external service
}
}
示例2:
public class MyHub : Hub
{
public static ConcurrentDictionary<string, MyUserType> MyUsers = new ConcurrentDictionary<string, MyUserType>();
public override Task OnConnected()
{
MyUsers.TryAdd(Context.ConnectionId, new MyUserType() { ConnectionId = Context.ConnectionId });
return base.OnConnected();
}
public override Task OnDisconnected(bool stopCalled)
{
MyUserType garbage;
MyUsers.TryRemove(Context.ConnectionId, out garbage);
return base.OnDisconnected(stopCalled);
}
public void PushData(){
//Values is copy-on-read but Clients.Clients expects IList, hence ToList()
Clients.Clients(MyUsers.Keys.ToList()).ClientBoundEvent(data);
}
}
public class MyUserType
{
public string ConnectionId { get; set; }
// Can have whatever you want here
}
// Your external procedure then has access to all users via MyHub.MyUsers
希望这能有所帮助!
发布于 2014-12-24 20:08:51
请允许我在重新连接上持不同意见。客户端仍在列表中,但connectid将更改。为了解决这个问题,我在重新连接时对静态列表进行了更新。
https://stackoverflow.com/questions/20908620
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