How Can I Efficiently Run Multiple Async Tasks in Parallel using .NET 4.5?

Efficient Parallel Async Task Execution in .NET 4.5

.NET 4.5 presents challenges when managing concurrent, long-running tasks. While Task.Run() offers a basic approach, it lacks the efficiency and elegance of leveraging asynchronous features fully.

A superior solution utilizes async/await to create truly asynchronous Sleep methods, allowing for interruptions and efficient resumption. Task.WhenAll() concurrently awaits the completion of multiple tasks.

Improved Code Example:

<code class="language-csharp">public static async Task Go()
{
    Console.WriteLine("Initiating tasks");

    Task<int> task1 = SleepAsync(5000);
    Task<int> task2 = SleepAsync(3000);

    await Task.WhenAll(task1, task2);

    int totalSleepTime = task1.Result + task2.Result;

    Console.WriteLine($"Total sleep time: {totalSleepTime} ms");
}

private static async Task<int> SleepAsync(int ms)
{
    Console.WriteLine($"Sleeping for {ms} ms");
    await Task.Delay(ms);
    Console.WriteLine($"Sleep of {ms} ms COMPLETE");
    return ms;
}</code>

This enhanced code uses async and Task.Delay() for non-blocking delays within SleepAsync. Go initiates both tasks concurrently via Task.WhenAll(), enabling parallel execution. Results are accessed using the Result property upon completion.

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