How Can I Coordinate and Retrieve Results from Multiple Concurrent Asynchronous Tasks?

Efficiently Handling Multiple Concurrent Asynchronous Operations and Their Results

This guide demonstrates how to concurrently execute multiple asynchronous tasks and retrieve their individual results. Let's say you have three independent asynchronous operations, each yielding a unique outcome. The objective is to run these tasks simultaneously and access their respective results once all are finished.

The Task.WhenAll method provides an elegant solution. This method creates a single task that completes only when all input tasks are complete. It then returns an array containing the results from each task.

Here's a practical implementation:

<code class="language-csharp">Task<string> catTask = FeedCatAsync();
Task<bool> houseTask = SellHouseAsync();
Task<int> carTask = BuyCarAsync();

await Task.WhenAll(catTask, houseTask, carTask);

string catResult = await catTask;
bool houseResult = await houseTask;
int carResult = await carTask;</code>

In this example, catTask, houseTask, and carTask represent your asynchronous operations. Task.WhenAll initiates them concurrently. The await Task.WhenAll(...) line pauses execution until all three tasks are concluded.

After completion, you can access the individual results by awaiting each original task. The results are stored in catResult, houseResult, and carResult, ready for further processing.

It's crucial to remember that asynchronous methods, upon invocation, immediately return a "hot" task—one that's already started. Therefore, you must use await (as shown above) or Task.Result to obtain the actual results. Using await is generally preferred for its clarity and exception handling capabilities.

The above is the detailed content of How Can I Coordinate and Retrieve Results from Multiple Concurrent Asynchronous Tasks?. For more information, please follow other related articles on the PHP Chinese website!