How to Achieve Asynchronous Process Execution in .NET?

Asynchronous Process Execution in .NET

In .NET, the Process.Start() method is used to execute external applications or batch files. However, this method is synchronous, meaning it blocks the calling thread until the process finishes.

For scenarios where asynchronous execution is desired, you may wonder if there's an equivalent to Process.Start() that allows you to await its completion.

Answer

While there's no direct asynchronous equivalent of Process.Start(), there are two approaches to accommodate this need:

1. Using Task.Run()

If you simply want to run the process asynchronously without waiting for its completion, you can utilize the Task.Run() method:

void RunCommandAsync()
{
    Task.Run(() => Process.Start("command to run"));
}

2. Waiting Asynchronously for Process Completion

If you need to asynchronously wait for the process to finish before proceeding, you can leverage the Exited event and a TaskCompletionSource:

static Task<int> RunProcessAsync(string fileName)
{
    var tcs = new TaskCompletionSource<int>();

    var process = new Process
    {
        StartInfo = { FileName = fileName },
        EnableRaisingEvents = true
    };

    process.Exited += (sender, args) =>
    {
        tcs.SetResult(process.ExitCode);
        process.Dispose();
    };

    process.Start();

    return tcs.Task;
}

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