c# - How do I invoke method after a task is completed? -


hello i'm trying alert user when images have been deep zoomed , zipped. each image asynchronously deep zoomed , zipped , after images have been deep zoomed , zipped wish alert user pop up.

var z = task.factory.startnew( () => {     cr.create(current_file_name, output);     file.copy(path.getdirectoryname(assembly.getexecutingassembly().location) + "\\htmlviewer.html", outputpath + "\\htmlviewer.html", true);      zipfile.createfromdirectory(outputpath, directory.getparent(outputpath) + "\\" + path.getfilenamewithoutextension(current_file_name) + ".zip"); });  var tasks = new[] { z }; var continued = task.whenall(tasks).continuewith((antecedent) => {     _window.maindispatcher.begininvoke(new action(     () =>     {         _popup.popuptext = "deepzoom completed";         _popup.beginpopuptimer();     })); }, taskcontinuationoptions.onlyonrantocompletion);

i used followed solution example : https://stackoverflow.com/questions/12248832/how-to-check-that-all-tasks-have-been-properly-completed#= can't seem working. clarify; code within foreach iterates through set of images. when images have been zipped, want _popup.beginpopuptimer method invoked.

try use async await

private async task domywork() {     var z = task.factory.startnew(     () =>     {         cr.create(current_file_name, output);         file.copy(path.getdirectoryname(assembly.getexecutingassembly().location) + "\\htmlviewer.html", outputpath + "\\htmlviewer.html", true);          zipfile.createfromdirectory(outputpath, directory.getparent(outputpath) + "\\" + path.getfilenamewithoutextension(current_file_name) + ".zip");     });      var tasks = new[] { z };     await task.whenall(tasks);      _window.maindispatcher.begininvoke(() =>     {         _popup.popuptext = "deepzoom completed";         _popup.beginpopuptimer();     }); }

when have 1 task not have use task.whenall. can use use:

await task.factory.startnew( () => {     cr.create(current_file_name, output);     file.copy(path.getdirectoryname(assembly.getexecutingassembly().location) + "\\htmlviewer.html", outputpath + "\\htmlviewer.html", true);      zipfile.createfromdirectory(outputpath, directory.getparent(outputpath) + "\\" + path.getfilenamewithoutextension(current_file_name) + ".zip"); });  _window.maindispatcher.begininvoke(() => {     _popup.popuptext = "deepzoom completed";     _popup.beginpopuptimer(); });

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