c# - Download multiple files async and wait for all of them to finish before executing the rest of the code -

i trying download multiple files internet , await of them finish. c# console application running, no progress bar event handler should necessary. continues execute code though files have not been downloaded.

• 1.downloading files!
• 2.finished download file a
• 3.finished downloading files!
• 4.finished downloading file b
• 5.finished downloading file c

how await till async download files finished.

 private void downloadmultiplefiles(list<documentobject> doclist)     {         foreach(var value in doclist){             try             {                 using (webclient webclient = new webclient())                 {                     string downloadtodirectory = @resources.defaultdirectory + value.docname;                     webclient.credentials = system.net.credentialcache.defaultnetworkcredentials;                     webclient.downloadfilecompleted += client_downloadfilecompleted;                     webclient.downloadfileasync(new uri(value.docurl), @downloadtodirectory);                      //add them local                     context.listoflocaldirectories.add(downloadtodirectory);                 }                      }             catch (exception)             {                 errors.printerror("failed download file: " + value.docname);             }         }     } 

the downloadfileasync/downloadfilecompleted members of webclient use event-based asynchronous pattern. if want use async , await, should using task-based asynchronous pattern.

in case, should use downloadfiletaskasync member, such:

private async task downloadfileasync(documentobject doc) {   try   {     using (webclient webclient = new webclient())     {       string downloadtodirectory = @resources.defaultdirectory + value.docname;       webclient.credentials = system.net.credentialcache.defaultnetworkcredentials;       await webclient.downloadfiletaskasync(new uri(value.docurl), @downloadtodirectory);        //add them local       context.listoflocaldirectories.add(downloadtodirectory);     }            }   catch (exception)   {     errors.printerror("failed download file: " + value.docname);   } }  private async task downloadmultiplefilesasync(list<documentobject> doclist) {   await task.whenall(doclist.select(doc => downloadfileasync(doc))); } 

please note context.listoflocaldirectories.add , errors.printerror methods should threadsafe.