subscribe

问题 Am using reactive extensions in C# to perform some calculations. Here is how my code looks like so far. I have tried to wrap the code around so that I can show progress while to executing a series of tasks within my Calculate method Here is the observable IObservable<ResultWithProgress<SampleResult>> Calculate(){ return Observable.Create<ResultWithProgress<SampleResult>>(obs => { var someTask = DoSomeTask1(); obs.OnNext(new ResultWithProgress(){Progress = 25, ProgressText ="Completed Task1"})

问题 I'm using a shareData service using BehaviorSubject like the one below. My problem is that every time I call the service's changeMessage method from one component the listener messageSource subscription in any other component is called several times, looks like it received the same message several times. Is this expected behavior? How to prevent it? The service is a singleton. I do not call changeMessage multiple times @Injectable() export class ShareDataService { messageSource = new

问题 I've a MQTT Service Class, MyMqttService.class, runing when I log in in my app: Intent intent = new Intent(getApplicationContext(), MyMqttService.class); startService(intent); Then I have various Activities and in one of them, I have switch buttons to select which channels I want to subscribe. In my onPause/onResume, I check which buttons are on and which are off and make them go to that same state when I come back to that Activity. The problem is, if there is at least one button on when I

问题 I am new in Angular, I need to implement a function that returns true/false, I going to use the return in canActivate guard, but this function consumes a api by http.get, so like the communication is asynchronous this function always return FALSE, because http.get yet is in process. My class guard: canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean { let url: string = state.url; if (this.loginService.isLoggedIn()) { return true; } this.loginService.redirectUrl =

问题 For example, if these codes: Button button1 = new Button(); // ... button1.Click -= button1_Clicked; are executed before: button1.Click += button1_Clicked; I found no error or exception, but I am wondering if there is any downside here. If it is safe, why is it allowed to unsubscribe from an event that has never been subscribed? 回答1: I can't find a reference specific to events, but it is documented for the underlying function that events use, Delegate.Remove : Returns source if value is null

问题 What is a complete jQuery solution to subscribing uses to a list on Mailchimp? The problem is that most solutions either use a library or require server side code. I want a quick elegant solution, which gives me complete control over the UI, hence UX of the form and it's functionality. 回答1: @Nagra's solution is good but it will throw an error when executed from the client's browser due to the Same-Origin Security Policies in effect. In essence, these security measures are there to prevent

问题 Whats the way to simplify something like the following code example? I can't find the right operator.. could anyone give a short example? this.returnsObservable1(...) .subscribe( success => { this.returnsObservable2(...) .subscribe( success => { this.returnsObservable3(...) .subscribe( success => { ... }, 回答1: As mentioned in comments, you are looking for the flatMap operator. You can find more details in previous answers : How to do the chain sequence in rxjs Why do we need to use flatMap?

问题 Whats the way to simplify something like the following code example? I can't find the right operator.. could anyone give a short example? this.returnsObservable1(...) .subscribe( success => { this.returnsObservable2(...) .subscribe( success => { this.returnsObservable3(...) .subscribe( success => { ... }, 回答1: As mentioned in comments, you are looking for the flatMap operator. You can find more details in previous answers : How to do the chain sequence in rxjs Why do we need to use flatMap?

问题 I am currently programming a Jump n' Run game in C# using OpenTK Framework and OpenGL. Open TK provides preset functions like GameWindow.Run(); or GameWindow.onUpdateFrame(); onRenderFrame(); As far as i thought through it, all actions that draw OpenGL elements or primitives should belong into onRenderFrame, whereas game events like player movement should be performed in onUpdateFrame, so these actions can be calculated in advance before rendering a new frame. Am I right? Would it make a

问题 I want my ngOnInit function do next things: - make http request for some data using this.structureRequest.sendRequest(),which works fine, and after data have been received to start view it using this.viewNodes() function. I use subscribe , but it does not work, I think I do something wrong with subscribe function. please help:) HomeComponent.ts import {Component} from '@angular/core'; import {Observable} from 'rxjs/Observable'; import {StructureRequestService} from './StructureRequestService'