c# - CoreDispatcher.HasThreadAccess "breaking change" -


i taking on application developed mvvmcross.vnext.
while trying update mvvmcross.v3, found following breaking change: in constructor of mainviewmodel, show loginviewmodel (showviewmodel()). worked fine in vnext.
v3, loginview doesn't show.
after long search, found out following code, added in mvxstoremainthreaddispatcher.requestmainthreadaction :

        if (_uidispatcher.hasthreadaccess)         {             action();             return true;         }

was responsible troubles.
if comment out, application works previously, guess code there reasons...
have suggestions ?
can force previous behavior without changing mvvmcross source code?
should refactor code handle loginview differently ?
in advance comments.
philippe

while trying update mvvmcross.v3, found following breaking change: in constructor of mainviewmodel, show loginviewmodel (showviewmodel()). worked fine in vnext.

i think constructor navigation have broken on several platforms in mvvmcross version. honest, think lucky worked before.

the problem viewmodels constructed (or located) during view events such viewdidload, onnavigatedto, , oncreate - , these events called during 'page transitions'

to work around need move login navigation out of constructor.

how depends on app

  • if need home->login backstack, can trigger off async or time delay or can trigger off other view event such viewdidappear

  • if don't need backstack way implement sort of thing use custom imvxappstart - like:

    public class appstart     : mvxnavigatingobject     , imvxappstart       {     public void start(object hint = null)     {         var authservice = mvx.resolve<imyserice>();         if (authservice.isloggedin)         {             showviewmodel<homeviewmodel>();         }         else         {             showviewmodel<loginviewmodel>();         }     } }

    (you can see example in https://github.com/slodge/mvvmcross/blob/v3/sample%20-%20cirriousconference/cirrious.conference.core/applicationobjects/appstart.cs)

    this can registered in app.cs startup using:

    registerappstart(new appstart());

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