Windows Phone, Prism.StoreApps: How to avoid activation of a certain page after suspension or termination? -


i want ensure in case app navigated page, app on (in case previous) page after suspended or terminated. in case page taking photos. not want user return page after app in background since has no context information. context information on previuos page.

how achieve prism.storeapps?

background: if app suspended state of app remains after resumed, hence last active page active again. have no real idea how set page active in case. if app terminated prim.storeapps restores navigation state , navigates last active view model (hence last active page). not know either how alter navigation state in case page navigated to.

in meantime fond working solution myself. might not best , there might better solutions, works.

for resuming app handle resuming event:

private void onresuming(object sender, object o) {    // check if current root frame contains page not want     // activated after resume    var rootframe = window.current.content frame;    if (rootframe != null && rootframe.currentsourcepagetype == typeof (nottoberesumedonpage))    {       // in case page don't want activated after resume activated:       // go previous page (or optionally page)       this.navigationservice.goback();    } }

for page restore after termination firstly use property in app class:

public bool mustpreventnavigationtopagenottoberesumedon { get; set; }  public app() {     this.initializecomponent();      // assume app restored termination , therefore must prevent navigation      // page should not navigated after suspension , termination.      // in onlaunchapplicationasync mustpreventnavigationtopagenottoberesumedon set false since      // onlaunchapplicationasync not invoked when app restored termination.     this.mustpreventnavigationtopagenottoberesumedon = true;       this.resuming += this.onresuming; }  protected override task onlaunchapplicationasync(launchactivatedeventargs args) {    // if application launched not prevent navigation    // page should not navigated to.    this.mustpreventnavigationtopagenottoberesumedon = false;     this.navigationservice.navigate("main", null);     return task.fromresult<object>(null); }

in onnavigatedto of page not want activated on resume check property , navigate if true (and set property false allow subsequent navigation):

public override void onnavigatedto(object navigationparameter, navigationmode navigationmode,     dictionary<string, object> viewmodelstate) {    if (((app)application.current).mustpreventnavigationtopagenottoberesumedon)    {       // if must prevent navigation page (that should not navigated after        // suspension , termination) reset marker , go back.        ((app)application.current).mustpreventnavigationtopagenottoberesumedon = false;       this.navigationservice.goback();    }    else    {       base.onnavigatedto(navigationparameter, navigationmode, viewmodelstate);    } }

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