c# - Wait on function to complete -

in 1 of functions i'm getting document:

controller.retrievedocument(documentid); // here want work after document has finished loading 

this how function build up:

public async void retrievedocument(string documentid){     documentresult documentresult = await getdocumenttask (documentid);     // checks here } 

the called function this:

private async task<documentresult> getdocumenttask (string documentid){      try{         loadingspinner.show();         documentresult = await task.run(() => manager.getdocument (documentid));         loadingspinner.hide();     }     catch(exception ex)     {         //     } } 

now want if retrievedocument has been finished other work. problem retrievedocument asynchronous , other code executed before function has finished loading. there 2 options comes mind:

1. wait on retrievedocument somehow.
2. make synchronous.
3. use separate event in retrievedocument

i don't know how should wait on retrievedocument described in 1. tried make synchronous loading spinner not correctly show. seems waits on webservice call , if has been finished spinner shown shortly. introduces kind of lag. if use asynchronously don't behavior , loading spinner correctly shown. no. 3 option seems best, how other options work?

what i'm missing here?

you either want rewrite function as...

public async task retrievedocument(string documentid){     documentresult documentresult = await getdocumenttask (documentid);     // checks here } 

or

public task retrievedocument(string documentid){     task<documentresult> documentresult = getdocumenttask (documentid);     // checks here     return documentresult; } 

however want former.

you need return task, object wraps concepts of, work in flight, completion event. async await clever syntaxic sugar, few cool libraries added in (mostly error handling).