How Can I Achieve Efficient Event-Based Asynchronous Execution in .NET?

Achieving Efficient Asynchronous Operations in .NET

Asynchronous programming often requires pausing execution until a specific event triggers. Traditional methods like polling or thread blocking are inefficient and consume excessive resources. Fortunately, modern .NET offers superior solutions for event-driven asynchronous execution.

Leveraging SemaphoreSlim for Synchronization

The SemaphoreSlim class provides a robust signaling mechanism. A SemaphoreSlim instance acts as a signal, enabling a thread to wait until another thread releases it. Consider this example:

<code class="language-csharp">private SemaphoreSlim signal = new SemaphoreSlim(0, 1);

// Release the signal when the "Continue" button is pressed
private void ButtonContinue_Click(object sender, RoutedEventArgs e)
{
    signal.Release();
}

// Await the signal in `GetResults`
private async Task GetResults()
{
    await signal.WaitAsync();
    // Proceed after signal release
}</code>

Utilizing TaskCompletionSource for Task Management

Alternatively, TaskCompletionSource offers a way to create a Task representing event completion. This task can then be awaited elsewhere in the code. Here's an illustration:

<code class="language-csharp">private TaskCompletionSource<bool> tcs = new TaskCompletionSource<bool>();

// Complete the task when the "Continue" button is pressed
private void ButtonContinue_Click(object sender, RoutedEventArgs e)
{
    tcs.SetResult(true);
}

// Await the task in `GetResults`
private async Task GetResults()
{
    await tcs.Task;
    // Proceed after task completion
}</code>

Summary

SemaphoreSlim and TaskCompletionSource offer efficient, event-driven methods for managing asynchronous execution pauses and resumptions in C#. These techniques create responsive, scalable asynchronous code without the overhead of busy-waiting or thread blocking.

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