How Can I Asynchronously Wait for Process Exit in C# Without Freezing the GUI?

Waiting for Process Exit Asynchronously

In many applications, it is essential to wait for a process to exit before proceeding further. However, using Process.WaitForExit() can cause the graphical user interface (GUI) to freeze. To avoid this issue, an event-based or thread-based solution is required.

Event-Based Approach

As of .NET 4.0/C# 5, the async pattern provides a more elegant way to represent the waiting process. The WaitForExitAsync() method can be added to the Process class, enabling the application to asynchronously wait for the process to exit:

public static Task WaitForExitAsync(this Process process, CancellationToken cancellationToken = default(CancellationToken))

Inside the method:

• If the process has already exited, the method returns a completed task immediately.
• Otherwise, a TaskCompletionSource