.net - How to update gui in c# wpf from asynchronous method callback -


i've search on stackoverflow , in net , couldn't find solution problem.

i read stream in async way. want callback update gui

[stathread]     private void clientloggedcallback(iasyncresult res)     {         try         {             mailclient.helpers.client.getinstance().client.getstream().endwrite(res);             mailclient.helpers.client.getinstance().asyncrecieveencryptedprotocolmessage(new asynccallback(logininfo_recieved));         }         catch { }     }     [stathread]     private void logininfo_recieved(iasyncresult res)     {         try         {             mailclient.helpers.client.getinstance().client.getstream().endread(res);             mailclient.asyncstate state = (mailclient.asyncstate)res.asyncstate;             string answer = aes.decryptstringfrombytes_aes(state.buffer, state.aes_key, state.aes_iv);             if (answer.contains("ok"))             {                 string[] answer_params = answer.split(',');                 loggeduserinfo.user_id = convert.toint32(answer_params[1]);                 loggeduserinfo.user_login = answer_params[2];                  //zalogowano                 //this.targetwindow = new messagelistswindow();                 dispatcher.currentdispatcher.invoke(dispatcherpriority.background, new action(() => this.targetwindow = new messagelistswindow()));                 //system.windows.application.current.dispatcher.invoke(dispatcherpriority.background,  new action(() => this.targetwindow = new messagelistswindow()));             }             else             {                 //zle dane                 system.windows.messagebox.show("zle dane");             }         }         catch(exception exep) { }     }

this declaration of asyncsendencryptedprotocolmessage

asyncsendencryptedprotocolmessage(string message, asynccallback callback)

use function 

clientstream.beginwrite(encryptedmessage, 0, encryptedmessage.length, callback, st);

when code executes exception "the calling thread must sta, because many ui components require this." read "setapartmentstate(apartmentstate.sta);" don't know how apply callback. i've tried stathread attribute doesn't work. use mvvm light framework.

stacktrace

" w system.windows.threading.dispatcherobject.verifyaccess()\r\n   w system.windows.application.get_mainwindow()\r\n   w mailclient.viewmodel.mainwindowmodel.logininfo_recieved(iasyncresult res) w c:\\users\\oem\\documents\\visual studio 2012\\projects\\mvvmlight3\\mailclient\\viewmodel\\mainwindowmodel.cs:wiersz 171" 

 public static void dispatch(this dispatcherobject source, action func)     {         if (source.dispatcher.checkaccess())             func();         else             source.dispatcher.invoke(func);     }

and use this:

mailclient.helpers.client.getinstance() .asyncrecieveencryptedprotocolmessage(new asynccallback(()=>  application.current.mainwindow.dispatch(logininfo_recieved)));

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