How Can Task.WhenAll Improve Concurrent Asynchronous Task Execution and Synchronization in C#?

Efficient concurrent asynchronous task execution and synchronization: Detailed explanation of Task.WhenAll

When working with asynchronous tasks in a C# console application, coordinating task execution and waiting for its completion can be a challenge. This article will provide a simple implementation solution for running multiple asynchronous tasks concurrently and synchronously completing them.

Traditional methods use blocking methods like Task.WaitAll to wait for all tasks to complete. However, this method blocks the execution thread and is inefficient. In order to find a more optimized solution, let us explore the Task.WhenAll method.

Task.WhenAll method

Task.WhenAll is an awaitable method that accepts an array of tasks as a parameter. Unlike Task.WaitAll, it does not block the thread of execution. Instead, it returns a new task that represents the combined result of all input tasks.

Implementation example

Here is an example of how to use Task.WhenAll to run and synchronize multiple asynchronous tasks:

<code class="language-csharp">var task1 = DoWorkAsync();
var task2 = DoMoreWorkAsync();

await Task.WhenAll(task1, task2);</code>

In this code, DoWorkAsync and DoMoreWorkAsync are asynchronous methods that represent your tasks. Task.WhenAllCreate a new task that will only complete when both input tasks have completed. By waiting for this combined task, the execution thread will resume after all input tasks have completed.

Exception handling

Compared with Task.WaitAll, Task.WhenAll provides more detailed exception handling. If any input tasks fail, the returned tasks also fail, aggregating the exceptions from the failed tasks. If all tasks complete successfully, the returned tasks will be in RanToCompletion status.

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