c# - UI freezes when using async await -

c# - UI freezes when using async await -

i have troubles create ui work using async method. here part of code

private async void btndooutput_click(object sender, routedeventargs e) { /* initiliaze */ groupboxconfiguration.isenabled = false; var progressindicator = new progress<int>(); progressindicator.progresschanged += (s,value) => { progressexport.value = (double)value; labelpercentage.content = "export in progress : " + value + " %"; }; /* work */ switch (something) { case 1: await method(input, output, options, progressindicator); break; default: break; } /* finalization */ groupboxconfiguration.isenabled = true; }

the method

public async static task<string> method(string input, string output, string options, iprogress<int> progress) { while(something) { //operations on input , output if (progress != null) { progress.report(percentage); } } }

when click on button, ui freezes, groupbox still enabled, progress not shown until end.

i think misunderstanding how async / await works. of code still running on ui thread because don't tell otherwise. means await on method pointless because it's going run synchronously anyway.

the purpose of async/await allow calling code chance go on processing until hits part of code requires result of awaitable task. in example, need alter method body homecoming awaitable task

public task method(string input, string output, string options, iprogress<int> progress) { homecoming task.run(() => { while(something) { //operations on input , output if (progress != null) { progress.report(percentage); } } }); }

c# wpf user-interface asynchronous async-await