c# - SignalR objects are not being deleted from the heap even when the hub connection is disposed -


i have web application sends messages server front end (javascript) client using signalr. however, there end (.net) client creates proxy hub. end client processes messages , sends them hub, , hub sends these messages front end client.

here snippet of end client creates hub connection , proxy send messages hub:

hubconnection hubconnection = new hubconnection(serverurl); ihubproxy hubproxy = hubconnection.createhubproxy(hubname); task t = task.run(() => hubconnection.start(new longpollingtransport())); t.waitandunwrap(); if (hubproxy != null && hubconnection.state == connectionstate.connected) {     await hubproxy.invoke("messageclients", messageargs); }

there more code, covers essential part.

the key part is, every time message created, code called. means there hubconnection object created every message needs sent hub, , front end client. after making memory dump, realized lot of objects remain on heap , causing memory leak. figured it's because i'm not disposing hub connection, since 1 of main culprits microsoft.aspnet.signalr.transports.longpollingtransport, on thousand objects on heap after playing around website hour (doing things create these signalr messages).

so thought disposing hubconnection fix things:

using (hubconnection hubconnection = this.createhubconnection()) {     if (hubconnection != null)     {         ihubproxy hubproxy = this.startconnection(hubconnection);         if (hubproxy != null && hubconnection.state == connectionstate.connected)         {             await hubproxy.invoke("messageclients", messageargs);         }     } }  private hubconnection createhubconnection() {     // basic auth set     hubconnection hubconnection = new hubconnection(this.serverurl);     hubconnection.headers.add('authtoken', basicauth);     return hubconnection; }  private ihubproxy startconnection(hubconnection hubconnection) {     ihubproxy hubproxy = hubconnection.createhubproxy(this.hubname);     task t = task.run(() => hubconnection.start(new longpollingtransport())     t.waitandunwrap();     return hubproxy; }

but after running process , attaching windbg it, when -!dumpheap -stat -type microsoft.aspnet.signalr.transports, again see microsoft.aspnet.signalr.transports.longpollingtransport there similar high figures objects on heap + memory. shouldn't using statement cause hubconnection disposed , therefore removed heap? should doing fix memory leak?

it turns out disposing hub connection does work. conflating 2 concepts: disposing unmanaged resources , deleting objects heap.

i thought when using statement hubconnection object finishes (i.e., when dispose called on hubconnection), windbg no longer show object in memory dump. since memory dump based on what's on heap, , since disposing object doesn't delete object heap (just allows released , deleted garbage collector), still showing in windbg.

i played around application more until garbage collector did work, , found objects deleted later.

i should note original question emphasized type microsoft.aspnet.signalr.transports.longpollingtransport, , because not disposing longpollingtransport object either (when hubconnection.start(new longpollingtransport()). code looks following:

using (hubconnection hubconnection = this.createhubconnection()) {     if (hubconnection != null)     {         using (longpollingtransport lptransport = newlongpollingtransport())         {             ihubproxy hubproxy = this.startconnection(hubconnection, lptransport);             if (hubproxy != null && hubconnection.state == connectionstate.connected)             {                 await hubproxy.invoke("messageclients", messageargs);             }         }     } }  private hubconnection createhubconnection() {     // basic auth set     hubconnection hubconnection = new hubconnection(this.serverurl);     hubconnection.headers.add('authtoken', basicauth);     return hubconnection; }  private ihubproxy startconnection(hubconnection hubconnection, httpbasedtransport transport) {     ihubproxy hubproxy = hubconnection.createhubproxy(this.hubname);     task t = task.run(() => hubconnection.start(transport));     t.waitandunwrap();     return hubproxy; }

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