c# - WPF multi-thread progress update -

i'm need display form of feedback user, while small process (7-10 seconds) takes place in background.

i had no issues in past using separate threads , backgroundworkers in windows forms, proving difficult in wpf.

i have read many articles, in respect, , how should using dispatchers in wpf start new thread, etc. however, when try use backgroundworker display form of waiting image feedback, remains static.

i don't believe matters, uses mui firstfloor (https://github.com/firstfloorsoftware/mui).

i'm trying use built-in progressring feature (which works no problems when run within same thread , there no other major tasks running in background.

adding backgroundworker, brings exception due cross thread access of objects, though many blogs states backgroundworks in wpf cross thread aware , safe run.

the following closest code generates need.

    private async void mytaskprocess()     {          await dispatcher.begininvoke(dispatcherpriority.send, new threadstart(() =>         {             try             {                 //update waiting ring image                 progressring.isactive = true;             }             catch             {                 progressring.isactive = false;                 messagebox.show("exception thrown");             }         }));           await dispatcher.begininvoke(dispatcherpriority.background, new threadstart(() =>         {             try             {                         //run main ms excel export function                 export2excel();                 progressring.isactive = false;             }             catch             {                 messagebox.show("exception thrown");             }         }));      } 

any feedback appreciated.

the way in modern wpf application start new task in work; under covers perform work on thread pool thread:

task.factory.startnew(this.dowork) 

now in doworkto report progress invokeasync main thread whenever porgress count changes:

void dowork() {     foreach(var item in this.workitems)     {         //          // report progress         ++progress         application.current.dispatcher.invokeasync(() => this.progress = progress);     } }