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

Mary-Kate Olsen
Mary-Kate OlsenOriginal
2025-01-04 14:25:43430browse

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 is created and the EnableRaisingEvents property of the process is set to true.
  • An event handler is attached to the Exited event of the process, which sets the result of the task completion source when the process exits.
  • If a cancellation token is provided, it is registered to cancel the task if invoked.
  • The task is returned, which is completed when the process exits or when the cancellation token is invoked.

    • Usage

    To use the WaitForExitAsync() method:

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

    // Do some fun stuff here...
}

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