Background and motivation

Currently I use ProcessStartInfo/Process.Start to launch processes with overridden environment variables, redirect standard input and output, and so forth.

I now need to use the CREATE_SUSPENDED flag so that I can modify the process after it's created and before it starts actual execution, but there's no way to pass this flag into ProcessStartInfo/Process.Start. Given that I still need to use all the other features of ProcessStartInfo, the only reasonable path I can see forward is to either copy or reimplement the entirety of the System.Diagnostics.Process code.

My proposal would also be cross-platform.

API Proposal

namespace System.Diagnostics;

public sealed partial class ProcessStartInfo
{
    public bool CreateSuspended { get; set; }
}

public partial class Process
{
    public bool Resume();
}

API Usage

var process = new Process()
{
    StartInfo = {
        FileName = executable,
        CreateSuspended = true,
        CreateNoWindow = true, // for reference only, as it has the same characteristics
    }
};

process.Start();

// Do whatever is needed with the process...

process.Resume();

Alternative Designs

I don't think these issues are duplicates since they adopt a different design that doesn't seem to get traction.

#71515
#90581

NB: @hach-que I copied your proposal and tried to make the API easier to get through the review process.

Risks

No response