Await

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Internals of How the await Keyword Works

by David Deley

Internal working of the await keyword

async void – How to Tame the Asynchronous Nightmare

by Dev Leader

Problem with async void and a solution for it

Unified Concurrency I - Introduction

by ipavlu

The Cross-Platform Object-Oriented approach to Synchronization Primitives for .NET and .NET Core based on one shared pattern between two interfaces for General Threading and Async/Await.

C# Events to Awaitable Pattern

by Federico Alterio

Convert an Event-based API to an awaitable pattern API

Latest Articles

C# Events to Awaitable Pattern

by Federico Alterio

Convert an Event-based API to an awaitable pattern API

async void – How to Tame the Asynchronous Nightmare

by Dev Leader

Problem with async void and a solution for it

Internals of How the await Keyword Works

by David Deley

Internal working of the await keyword

Asynchronous Programming in JavaScript

by Gerd Wagner

The evolution of asynchronous programming in JavaScript: callbacks, promises, async/await

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Await

Internals of How the await Keyword Works

15 Mar 2022 by David Deley

Internal working of the await keyword

Await

async void – How to Tame the Asynchronous Nightmare

6 Feb 2023 by Dev Leader

Problem with async void and a solution for it

Async

Await

asynchronous

Unified Concurrency I - Introduction

24 Mar 2019 by ipavlu

The Cross-Platform Object-Oriented approach to Synchronization Primitives for .NET and .NET Core based on one shared pattern between two interfaces for General Threading and Async/Await.

C# Events to Awaitable Pattern

30 Apr 2023 by Federico Alterio

Convert an Event-based API to an awaitable pattern API

Await

Async

How do I switch between asynchronous and synchronous code?

15 Mar 2016 by RickZeeland

Here is a good article by Stephen Cleary: Async/Await - Best Practices in Asynchronous Programming[^]But I'm afraid he says what you don't want to hear:Quote:As you convert synchronous code to asynchronous code, you’ll find that it works best if asynchronous code calls and is called by...

Awaitable Concurrent Priority Queue

29 Dec 2017 by ipavlu

Optionally awaitable simple to use Concurrent Priority Queue.

Async Await Multiple Telnet Servers

12 Dec 2013 by Sergey Alexandrovich Kryukov

Why?! Create a separate thread to work with each separate telnet server and work synchronously. Synchronize those threads using thread synchronization in those rare cases when it is needed.I think asynchronous APIs get popularity when threads were not a commonplace, or just because many...

How to convert an await async function to a function that takes a callback as parameter?

19 Jan 2016 by Richard Deeming

How about something like this:public void GetDocumentWithCallback(Action callback, long ID){ Task task = GetDocumentAsync(ID); task.ContinueWith(t => callback(t.Result));}NB: Unlike the async version, callback will not be executed in the same context as...

Await

Async

Unified Concurrency IV - Going Cross-platform

24 Mar 2019 by ipavlu

The Cross-Platform Object-Oriented approach to Synchronization Primitives for .NET and .NET Core based on one shared pattern between two interfaces for General Threading and Async/Await.

Asynchronous Programming in JavaScript

6 Jul 2021 by Gerd Wagner

The evolution of asynchronous programming in JavaScript: callbacks, promises, async/await

Async Await Multiple Telnet Servers

15 Jul 2014 by Matthew Dennis

// assuming you have created a CancellationToken so you can cancel the Telnet Monitors.List telnetTasks = new List();for (var i = 0; i

How to make await async functions thread safe?

21 Jan 2016 by Richard Deeming

Assuming you want the return values to be 1 and 2, use the Interlocked.Increment Method[^] to increment the field, and store the result in a local variable to return at the end of the method:public class MyClass{ private int count = 0; public async Task GetCount() ...

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How to call async query in EF 6.0

27 Nov 2016 by Dave Kreskowiak

Your code is essentially single threaded. You've got 2 threads, but one is completely blocked waiting on the other. In any case, putting the LoadData code on a background thread, since it's the only thing you're doing, is no different than if you completely skipped all the Task/async/await...

EF6.0

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Async

Output.analysis = await task; return exception

6 May 2019 by OriginalGriff

Talk to the authors: if you go to your link page, you will find a line: Support questions: Stack Overflow[^] Follow the link, and ask them.

artificial-intelligence

I am using async await but still not able to store value or use value outside the function

12 Apr 2021 by Richard Deeming

You haven't understood how async and await work. The result of an async function is a Promise, which will be resolved at some later time with the actual return value. Inside another async function, you can await that Promise to get the return...

Cannot implicitly convert type 'task<ienumerable<producttypesdata>>' to 'task<actionresult<ienumerable<producttypesdata>>>' [API]

6 Feb 2023 by Richard Deeming

You need to await the task returned from GetProductTypes. Assuming you're using .NET Core / .NET 5+, you can then simply return that result - ActionResult has an implicit conversion[^] from T: [HttpGet] public async...

Execute Task in Task every 5 seconds // Put Task to sleep

22 Nov 2013 by NeonMika

Hi codeproject-community!I'm just diggin' into the TAP and I'm hoping you can help me with a problem.Let me first explain what I want to achieve:I want to read from a RSS-feed every 10 seconds and want to write it's items to output it somehow on my form.My idea:I wrote an...

Execute Task in Task every 5 seconds // Put Task to sleep

22 Nov 2013 by NeonMika

Okay, after reading some blogs i found some solution that work's pretty good for me: private Action getRss = null; private TaskScheduler ui = TaskScheduler.FromCurrentSynchronizationContext(); public ObservableCollection GuiListRssItems = new...

Async Await Multiple Telnet Servers

11 Dec 2013 by Member 10440446

Hi guys, any idea on how am I suppose to create an application on C# 5.0 using async await Telnet client.My scenario is that I have to telnet multiple servers at the same time. Also, i need it to check the servers continuously just like a ping /t function.Thanks much.. :)

WPF UI freezes when background thread runs LINQ

20 Dec 2013 by Yvan Rodrigues

The UI has a "loading" spinner. During the data loading below, the UI is responsive. During the LINQ, it freezes. The computer has 8 cores. public async static Task Load() { if (_loader == null) { _loader = Task.Run(() => ...

WPF UI freezes when background thread runs LINQ

20 Dec 2013 by bowlturner

if you have visual studio 2012 or greater (.Net Framework 4.5 I think) you can use the Async keywords http://msdn.microsoft.com/en-us/library/hh156513.aspx[^]if not your mostly likely solution will be to put the linq on it's own thread.

I thought await continued on the same thread

17 Feb 2014 by Marc Clifton

I thought one of the points about async/await is that when the task completes, the continuation is run on the same context when the await was called, which would, in my case, be the UI thread.So for example:System.Diagnostics.Debug.WriteLine("2: Thread ID: " +...

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sockets client+server with await/async c# 5.0

30 Apr 2014 by 123456789igor

Hello, i try to write a simple asynchronous client/server apps. I know how do it using callback, but i want to invistigate how write client+server using await/async and c# 5.0. Please, help me. It should be simple. Only connect and transfer some bytes.I know that this can be done using...

sockets client+server with await/async c# 5.0

1 May 2014 by 123456789igor

now server can send to client array of byte. But client recieved only 1 iteration. How i can do, that if client connected then it always recieve information from server?Server:public ServerSocket(IPAddress ipAddress, int port) { _server = new...

Converting XPSDocuments asynchronously failing

30 Jun 2014 by Kyle Gottfried

I've been trying to turn the code sample at http://code.msdn.microsoft.com/office/CSVSTOViewWordInWPF-db347436[^] into an asynchronous program. I've been running into issues where running the program by calling AssignDocument(w,x) using await causes it to run synchronously instead of...

ASYNC AND AWAIT equivalent code for sendgrid implementation for .net 3.5 application using vs 2010

14 Oct 2014 by mahesh kumar BM

here is the below code that is used to get the list of templates from sendgrid using async and await feature. but due to some limitations i cant use these feature in my application which is in .net 3.5/4 and i use vs 2010. i just need the equivalent code which will run at background without...

Is there any way to optimize my search blob program?

28 Nov 2014 by girishkalamati

if its possible you can go on with spinning up multiple thread , to process the blob items as async process !u can use the following code , it will for sure improve the performance :async public static Task ListBlobsSegmentedInFlatListing(){ // Retrieve storage account from...

How to wait for some task to finish in ASP:NET/C#

8 Dec 2014 by Santiago Fabian

Protected void Page_Load(object sender, EventArgs e){ XDocument response = ThirdPartyAPI.HttpRequest(someParams); if(response != null) { var node = response.Root.Elements("documents").Elements("document"); string url =...

How to wait for some task to finish in ASP:NET/C#

8 Dec 2014 by Assil

Looks to me that ThirdPartyAPI.HttpRequest is asynchronous method, in which case there should be some method or property in ThirdPartyAPI that indicates whether the HttpRequest is still busy or done..and that very API could be used in lieu of if(response != null)Can you look into that?

How to convert an await async function to a function that takes a callback as parameter?

19 Jan 2016 by Henrik R L

HiI need to have my own C# function in both an awaitable async version and in a version that takes a callback function as a parameter and can be called from multiple threads at the same time. The callback version must be based on the async version.My awaitable function is:public...

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How to make await async functions thread safe?

21 Jan 2016 by Henrik R L

HiLet's say you have a function like:public class MyClass{ //Asume that this for some reason needs to be a member variable private int count=0; public async Task GetCount() { ++count; //Could be some real work to do in a...

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How to make await async functions thread safe?

21 Jan 2016 by Afzaal Ahmad Zeeshan

Because as per C#, it is illegal to do so. Quote[^]:An await expression cannot be used in a synchronous function, in a query expression, in the catch or finally block of an exception handling statement, in the block of a lock statement, or in an unsafe context.The thing is, if you call...

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Wpf retrieving data from database freeze UI

26 Apr 2016 by Member 10312908

Hello everyone, I have a problem with UI locking.Why the UI is freezed? I think it shouldn't be until DownloadHotListAsync finish.Thanks a lot.What I have tried:private async void RetrieveHotlist(object sender, RoutedEventArgs e) //button click { await...

WPF

Async

Await

Wpf retrieving data from database freeze UI

26 Apr 2016 by VR Karthikeyan

Check this,1. c# - A list view in WPF makes the UI frozen duing data binding - Stack Overflow[^]2. c# - Preventing wpf window from hanging - Stack Overflow[^]

WPF

Async

Await

Wpf retrieving data from database freeze UI

26 Apr 2016 by George Swan

Could I suggest a few changes? After the await statement in the button click handler you are back on the dispatcher thread so you don’t need the Dispatcher BeginInvoke stuff. It is generally not a good idea to try to martial the threads yourself, you will get in a tangle. Leave all that to...

WPF

Async

Await

How to call async query in EF 6.0

27 Nov 2016 by SrikantSahu

I am trying to bind a gridview using EF 6.0 raw Sql query with Async, but the system goes on for endless execution and task.Result is never populated.What I have tried:protected void Page_Load(object sender, EventArgs e) { var task = LoadDataAsync(); task.Wait();...

EF6.0

Await

Async

How do I do async programming in webapi inside foreach in .NET 4.5

27 Sep 2017 by Charlie Andrews

Hello , I am trying to create an asp.net web api. This API will be called from a scheduler from cloud once every 15 minute where this API will look in db and Call an external third party web-service multiple times with different parameters.External service will just return true of false. ...

WebAPI

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How do I do async programming in webapi inside foreach in .NET 4.5

27 Sep 2017 by Richard Deeming

You're creating a series of Task objects, but never waiting for them to complete. The calling method will return before the work has finished. And if any of the tasks fails, it could end up taking down your entire process with an "unobserved exception" error. You should make the...

WebAPI

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Async

How load data asynchronously using ASP.NET webform

8 Dec 2017 by Member 13363439

Hi i have 3 method i want to load data like First come First Display.means which method execute first that should display in UI part .it should not wait for all method to be Complete. Here is My Sample code. this code is waiting for all function to be complete than page is loading.please help me...

(Async & await) vs (without async & await) in web API

13 Mar 2018 by Bala Manikanta Koorakula

I am new with Async and await using C# Programming. In WebAPI, we have created two API Controllers one with Async and await Programming and other is without that. We have done load testing using JMeter and we have got following results. Users Sync ...

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Wait query for return array

12 Apr 2018 by rikidev

Hi guys with the code below I open a pool connection to sql server! My problem is that I should wait for the query to run, then return, how can I implement this? What I have tried: const DbConfig = require('../Config/DatabaseConfig.js'); const sql = require('mssql'); async function...

How to set focus on WPF control from viewmodel when search button async command executed

20 Aug 2018 by Waqar (Vicky)

In my code behind i have a method OnFocusRequested which is called using Interface from my ViewModel when async search button command execute. the problem is that it is working fine when i just debug through each step from code. this code is not work in real time. I believe this is due to async...

How to set focus on WPF control from viewmodel when search button async command executed

20 Aug 2018 by Graeme_Grant

You can do it in code behind however can get messy if you have to do it for multiple controls. The answer is, where you need to use the code in more than one time, to use a behavior rather than code behind to encapsulate the code to avoid the same code in multiple places, reduces errors, and...

Multithreadin backgroundworker async & await login to SQL C# WPF

11 Dec 2018 by TABiSH777

Hi, you are on right track, you could use Backgroundworker for this purpose with ease, just remember some thing while working with multithread is that, we cannot access UI elements directly from another thread. And as entire code that's executed in Backgroundworker is in another thread we cannot...

C# WPF multithreading backgroundworker loading ..gif image as login

13 Dec 2018 by Gerry Schmitz

Yes; you display the (new) .gif in the "ProgressChanged" handler (because it runs on the caller's UI thread versus DoWork which "is" the background worker thread). And you have to call "ReportProgress" (to invoke ProgressChanged) from DoWork; it doesn't run by itself.

Output.analysis = await task; return exception

6 May 2019 by badarhn

hi all I'm testing the new Microsoft cognitive service example, the code below : GitHub - microsoft/Cognitive-Samples-VideoFrameAnalysis: A library with sample apps for continuous analysis of live video, using the Microsoft Cognitive Services Vision APIs.[^] when I try it returns an exception...

artificial-intelligence

Issue with async await while calling API in loop in SSIS script task

8 Oct 2019 by gouravkaila91

I am calling a c# web API using SSIS script task. The requirement is to pick request data from a table, convert each row to a request, call API for each request and store response in a table. I am looping around all rows of the table and calling API inside loop for one request (row) at a time....

Javascript function to find the first empty row in spreadsheet for automatic reports

15 Sep 2020 by hmdismail

I was writing some code for automatically generating report and appending it into a spreadsheet. The program runs periodically, each run generates a set of data and inserts it into the first empty row in a specific spreadsheet file. when writing...

How to return single array?

2 Nov 2021 by User 15365431

Hi, I am using async/await to fetch a file (createCharge.php) that contains arrays with data inside. Here is my html page that has the that fetches the createCharge.php file arrays data, the createCharge.php also creates a 'hosted_url'...

How to return single array?

2 Nov 2021 by Richard Deeming

Your PHP script is returning the URL as text. Your newurl variable will be a string containing the URL. It doesn't have a property called hosted_url, so newurl.hosted_url will be undefined. You haven't declared a variable called hosted_url in...

Cannot implicitly convert type 'task<ienumerable<producttypesdata>>' to 'task<actionresult<ienumerable<producttypesdata>>>' [API]

6 Feb 2023 by Agnib Pyne 2022

Hi All, I am facing a scenario where I am trying to return a list of "ProductTypes". I may need this list in many places in the code and so defined an async method and then calling that method from another async [HttpGet] method and trying to...

Cannot implicitly convert type 'task<ienumerable<producttypesdata>>' to 'task<actionresult<ienumerable<producttypesdata>>>' [API]

N 22 Apr 2024 by Member 16249372

public async Task>> GetStates() { return await _context.States.ToListAsync(); }

Async/Await Explained with Diagrams and Examples

15 Apr 2021 by David Deley

Explains program flow when using await in various scenarios

WPF

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Async

ASP.NET 4.5 Features - Part 1

21 Oct 2013 by Marla Sukesh

In this article, you should have basic knowledge of web development and some features introduced in prior versions of .NET Framework, especially ASP.NET features.

Unified Concurrency II - Benchmarking Methodologies

6 May 2021 by ipavlu

The goal of the Unified Concurrency is to unify access to different synchronization primitives in object-oriented fashion with one pattern and two interfaces for general and async/await methods.

Awaiting Expressions

28 Oct 2014 by dorodnic

Using the await keyword with Expression-Trees

Unified Concurrency III - Cross-benchmarking

21 Jan 2021 by ipavlu

The goal of the Unified Concurrency is to unify access to different synchronization primitives in object-oriented fashion with one pattern and two interfaces for general and async/await methods.

Understanding await and async through code

9 Aug 2014 by Talal Tayyab

The article provides a code first approach to understanding await/async and answers some of the basic questions.

C#5.0

.NET

Await

I thought await continued on the same thread

18 Feb 2014 by Marc Clifton

Turns out I was calling the async read before the UI was up and running, so there was no continuation context!

Await

Async

How do I switch between asynchronous and synchronous code?

15 Mar 2016 by Patrick Skelton

Hi,I know the internet is littered with fragments of information on this subject, but none of them seems to provide a clear explanation of how you incorporate async functions into synchronous code.I seem to be caught between a rock and a hard place. I have to call an API that provides...

Execute Task in Task every 5 seconds // Put Task to sleep

22 Nov 2013 by bowlturner

And why can't you just use System.Threading.Thread.Sleep(10000); in the while (!cancellationToken.IsCancellationRequested) Block?As far as how to wait for the GetRssItems you can use the ContinueWith to call a 'finish' or 'next' I have thisprivate void StartTask(long...

UiDispatcherHelper - Dispatcher Helper Class for UI Bound Actions in WPF

10 Apr 2017 by Swapnil Dhage

This is a helper/utility class that will add a layer of abstraction as well as separation for dispatcher related operations in WPF.

async / await example

13 Jul 2014 by Sharath C V

A simple async / await example

Building Responsive UI using Async Await in C#

20 Sep 2015 by Mithun Pattankar

Why build responsive UI? Answer seems obvious that end-user should experience that application doesn’t hang often (for developers POV, a time taking background operation makes it look like hanging). So lets learn building responsive UI using Async Await keywords Visual Studio 2012 introduced a

Using async/await, Seven questions about calling mechanisms.

19 Aug 2015 by Chris875

Please refer below for the several options to call a function with async/await.I put my questions below each option.Lets assume I have a 3rd party Dll and want to call a function of it asynchronously. Despite there is a function description one cannot know what actually happens...

I am using async await but still not able to store value or use value outside the function

13 Apr 2021 by Nawaz Pasha 2021

I am Using Async Await but still not able to store value or use value outside the function What I have tried: ...

Is there any way to optimize my search blob program?

10 Jun 2014 by Vi(ky

HelloI write this code to search the blob items (text files) on the basis of there content. For ex : if I search for "Good", then the files that contains "Good or good" word the name of that files should appear in search result. My code is working but i want to optimize it.class...

sockets client+server with await/async c# 5.0

1 May 2014 by 123456789igor

Connect success. But how to send bytes, i don't knowprivate readonly Socket _server; public ServerSocket(IPAddress ipAddress, int port) { _server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); _server.Bind(new...

How to wait for some task to finish in ASP:NET/C#

15 Feb 2015 by Gaurav_Chaudhary

You can use "Async" and "Await" keywords ,if it's C# 4.5 or above.. Check this out https://i-msdn.sec.s-msft.com/dynimg/IC612215.png[^]Thanks

How do I assign own continuation to each task in the async/await maneer without one waiting the others ?

27 Jul 2018 by Vasilievski

Hi, My issue is the following : I have n Tasks that run in parallel. I want each Task to have its own continuation that uses the result. (Think of a UI update, for each finished task) If I were only using Framework 4.0 Task, I would use the ContinueWith on each task. But I want to use await...

Task

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Async

How do I assign own continuation to each task in the async/await maneer without one waiting the others ?

2 Aug 2018 by Richard Deeming

You just need to await the task in the continuation methods. You'll probably also want to wait for all of the continuations to finish in your MainMethod. public async Task ReactToDoSomething(Task task) { int result = await task; // Do something here... } // Same for other "react...

Task

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How do I assign own continuation to each task in the async/await maneer without one waiting the others ?

30 Jul 2018 by George Swan

It may be a good idea to restructure your class to facilitate using the Task-based Asynchronous Pattern. I suggest that you change the signatures of some of your methods. Async void methods should be reserved for event handlers. My suggestion would be something like this. public async...

Task

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Multithreadin backgroundworker async & await login to SQL C# WPF

11 Dec 2018 by TheBigBearNow

Hello all, I have a C# WPF application with a database of users. I have it so a user with the correct info can login and depending if they are an Admin or a Customer it will take them to their appropriate menu. Now I want to have a loading .gif while the program is checking the database for the...

C# WPF multithreading backgroundworker loading ..gif image as login

13 Dec 2018 by TheBigBearNow

So far I haven’t had luck with my loading gif image when I am loading/checking my database connection I click my login button and I get no errors in my login I start my gif but I also start it in the dowork and progress section im not sure which section is actually right I know not to mess wih...