c# - MethodInvoker lost? -

this code:

private void taskgestionecartelle() {     task.factory.startnew(() => generalistacartelle())         .continuewith(t => generalistacartellecompletata()         , cancellationtoken.none         , taskcontinuationoptions.none         , taskscheduler.fromcurrentsynchronizationcontext()); }  private void generalistacartelle() {     // ... code }  private void generalistacartellecompletata() {     task.factory.startnew(() => copiacartelle())         .continuewith(t => copiacartellecompletato()         , cancellationtoken.none         , taskcontinuationoptions.none         , taskscheduler.fromcurrentsynchronizationcontext()); }  private void copiacartelle() {     if (txtlog.invokerequired)     {         txtlog.begininvoke(new methodinvoker(delegate { txtlog.appendtext("copio cartelle in corso..." + environment.newline); }));     } } 

it start thread. when finish, start thread (from continue with) , try write somethings in control on ui. in fact nothing written on txtlog. wrong?

i try write somethings in control on ui. in fact nothing written on txtlog. wrong?

because @ time, invoke not required. can modify if statement , add else part same.

private void copiacartelle() {     if (txtlog.invokerequired)     {         txtlog.begininvoke(new methodinvoker(delegate { txtlog.appendtext("copio cartelle in corso..." + environment.newline); }));     }     else // part when invoke not required.      {      txtlog.appendtext("copio cartelle in corso..." + environment.newline);     } } 

you can refactor text append path method , call method if-else