What is the use of Task-based asynchronous pattern (TAP)?

Question

A Task is work that runs asynchronously on a worker thread of thread pool, which is a back ground thread. Each Task will be assigned with a separate thread from the thread pool provided the availability of threads from thread pool. now using these Tasks you can consume the thread from the thread pool without you having to maintain threads using Thread Class. So, When a task is already asynchronous what's the point of TAP? Please help me understand this, thank you.

Answer 1

In .Net, therre are three patterns for performing asynchronous operations They are

1. Task based Asnynchronous Pattern (TAP)
2. Event based Asynchronous Pattern (EAP)
3. Asynchronous Programming Model (APM)

You can refer each of these in the below URL.
https://learn.microsoft.com/en-us/dotnet/standard/asynchronous-programming-patterns/

So here the classification is for the asynchronous patterns and Task based is one among other choices. Hope this is clear. You can read more about TAP below.

https://learn.microsoft.com/en-us/dotnet/standard/asynchronous-programming-patterns/task-based-asynchronous-pattern-tap

Hope this helps

Answer 2

C# is a top level language that calls system APIs. These system APIs are asynchronous. C# code is not asynchronous unless you use the TAP pattern or one of the pervious asynchronous patterns. When synchronous code calls a asynchronous API, the synchronous logic waits for the asynchronous API to complete before executing the next line of code. This can cause a bottleneck.

When asynchronous C# code calls a asynchronous API, the C# thread is returned to the thread pool rather than waiting for the asynchronous API to complete. When the asynchronous API returns a new thread executes the remaining code. This is a better use of resources.

Answer 3

Hi @Lalith ,
The Task-based Asynchronous Pattern uses Task, Task and ValueTask for asynchronous operations. It enables developers to define asynchronous functions within a single method definition, instead of having "begin" and "end" function pairs or separate callbacks. This makes coding the asynchronous function very intuitive and clear in C# 4.5 (version next). It also integrates a mechanism for progress reporting and a cancellation framework to complete the loop.
The following are the benefits of using Task which comes from TAP.

1. you can get the status of Task.
2. you can use cancelation mechanism.
3. you can get progress notifications of each asynchronous operation
4. you can combine multiple Tasks in several ways(Task.ContinueWith, Task.WhenAll, Task.WhenAny)

Hope them could be helpful.

Best Regards,
Xingyu Zhao
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