How Can I Asynchronously Wait for Process Exit in .NET Without Blocking?

Asynchronous Process.WaitForExit() with Events

Inquiring about a non-blocking alternative to Process.WaitForExit() has led to the discovery of a valuable event-driven approach. Particularly relevant for .NET 4.0/C# 5 and above, this async pattern offers an elegant solution.

Consider the following code snippet:

/// <summary>
/// Waits asynchronously for the process to exit.
/// </summary>
/// <param name="process">The process to wait for cancellation.</param>
/// <param name="cancellationToken">A cancellation token. If invoked, the task will return
/// immediately as canceled.</param>
/// <returns>A Task representing waiting for the process to end.</returns>
public static Task WaitForExitAsync(this Process process,
    CancellationToken cancellationToken = default(CancellationToken))
{
    if (process.HasExited) return Task.CompletedTask;

    var tcs = new TaskCompletionSource<object>();
    process.EnableRaisingEvents = true;
    process.Exited += (sender, args) => tcs.TrySetResult(null);
    if (cancellationToken != default(CancellationToken))
        cancellationToken.Register(() => tcs.SetCanceled());

    return process.HasExited ? Task.CompletedTask : tcs.Task;
}

To utilize this async method, simply call it as follows:

public async void Test()
{
   var process = new Process("processName");
   process.Start();
   await process.WaitForExitAsync();

   //Do some fun stuff here...
}

By embracing this event-driven, asynchronous approach, you can efficiently monitor process completion without compromising UI responsiveness.

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