c# - HttpClientt.SendAsync doesnt wait/lock execution -

- 



var httpresponsemessage = await httpclient.sendasync(message).configureawait(false); var datastream = await httpresponsemessage.content.readasstreamasync();

this idea should awaited, no matter executions exists method , returns ui. execution resumes when responses arrives, time ui has updated execution finished, when in fact hasn't. calling methods awaited.

initial method not awaited design (task.run(() => startdownload(selectedschedules)); starts ui method executing services triggers httpclient, when call finished ui should update progress, second httpclient.sendasyncis executed, execution returns ui

task.run(() => startdownload(selectedschedules)); //first call, initiated button  public async task startdownload(scheduleslist list) {     //var t = new task(() => _scheduleservices.download(list));     //t.start();     //await t;     await _scheduleservices.downloadiwcfdb(list, usbinfomodels); }  public async task download(scheduleslist scheduleslist) {                              await downloaddb(scheduleslist);         }  private async task downloaddb(scheduleslist scheduleslist) {     using (var httpclient = new httpclient())     {         var message = new httprequestmessage(new httpmethod("post"), apicallurls.getiwcfschedules)         {             content = new stringcontent(jsonconvert.serializeobject(scheduleslist), encoding.utf8, "application/json")         };          httpclient.timeout = timespan.fromminutes(20);         var httpresponsemessage= await httpclient.sendasync(message).configureawait(false);         var datastream = await httpresponsemessage.content.readasstreamasync();         using (stream contentstream = datastream, stream = new filestream(path.combine(directories.somedir, directories.somefilename), filemode.create, fileaccess.write, fileshare.none))         {             await contentstream.copytoasync(stream);         }     } }

call chain added, irrelevant code removed methods

you're problem lies within first call.

in code have:

task.run(()=>startdownload(selectedschedules)); //first call, initiated button //i assume afterwards update progressbar or give other progress feedback

what is: calls startdownload , immediately continues execution. other stuff (downloading etc) happening in background. remember method startdownload not block; returns task object. if not await task object, code proceed.

i guess wanted is: call startdownload, wait finish, update progress.

a quick solution mark event handler of button async, , use async way. method bit this:

private async void handleevent() {     await startdownload();     //update progress }

i can recommend blog post stephen cleary introduction async-await: https://blog.stephencleary.com/2012/02/async-and-await.html





wiki

Comments

Post a Comment

Popular posts from this blog

elasticsearch - what is the equivalent data type for geo_point in hibernate search? -

-
i using elastic search hibernate search.i want make 1 property data type geo_point ,so can draw tile map using kibana.is there equivalent data type in hibernate search geo_point in elastic search? you can use spatial feature of hibernate search: import org.hibernate.search.annotations.*; @entity @indexed @spatial public class hotel { @latitude double latitude @longitude double longitude // ... } you end geo_point field named location in document. for more information: https://docs.jboss.org/hibernate/stable/search/reference/en-us/html_single/#spatial wiki
Read more

firebase - How to wait value in Ionic 2 -

-
i'm trying wait value may change after execute "this.bookmarlist.take(1).subscribe(..." my problem when run application, execute second if statement "if(found==false)" before execute subscribe. this code may found thing wrong or need add additions solve problem. let loader = this.loadingctrl.create({ content: "", }); let found=false; loader.present().then(()=>{ this.bookmarklist.take(1).subscribe(data=>{ data.foreach(b=>{ if(b.nid==this.appservice.id && b.url==url){ let alert = this.alertctrl.create({ title: 'already bookmarked', subtitle: 'this note image bookmarked', buttons: ['ok'] }); alert.present(); found=true; } }) }) }).then(()=>{ if(found==false){ this.afd.list('/bookmark/').push({ uemail: th...
Read more

Jenkins: find build number for git commit -

-
each commit git repo triggers build of jenkins pipeline. i want retrieve buildnumber of old build commit hash. how can that? i know information exists because can find in ui. some background why want this: when tags commit want create release (by tagging docker image). each build push image containing build number. want find out build number corresponds commit can find image want release. if understand question correctly, first need create git hook trigger new build. part covered in answer how react new tags in git hooks? ', though if using github, bitbucket or gitlab, there may other ways of going it. then when build initiated, there build number provided variable ' build_number ' ,in jenkins. if want include git tag name, can use in script, there seems fews ways: git parameter plugin git tag message plugin typically these plugins create environment variable can consumed scripts. not providing more concrete examples, since not aware of exact ...
Read more