Can I get command line arguments of other processes from .NET/C#?

Question

I have a project where I have multiple instances of an app running, each of which was started with different command line arguments. I'd like to have a way to click a button from one of those instances which then shuts down all of the instances and starts them back up again with the same command line arguments.

I can get the processes themselves easily enough through

Process.GetProcessesByName()

, but whenever I do, the

StartInfo.Arguments

property is always an empty string. It looks like maybe that property is only valid before starting a process.

This question had some suggestions, but they're all in native code, and I'd like to do this directly from .NET. Any suggestions?

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Answer 1

This is using all managed objects, but it does dip down into the WMI realm:

private static void Main()
{
    foreach (var process in Process.GetProcesses())
    {
        try
        {
            Console.WriteLine(process.GetCommandLine());
        }
        catch (Win32Exception ex) when ((uint)ex.ErrorCode == 0x80004005)
        {
            // Intentionally empty.
        }
    }
}

private static string GetCommandLine(this Process process)
{
    var commandLine = new StringBuilder(process.MainModule.FileName);

    commandLine.Append(" ");
    using (var searcher = new ManagementObjectSearcher("SELECT CommandLine FROM Win32_Process WHERE ProcessId = " + process.Id))
    {
        foreach (var @object in searcher.Get())
        {
            commandLine.Append(@object["CommandLine"]);
            commandLine.Append(" ");
        }
    }

    return commandLine.ToString();
}

Can I get command line arguments of other processes from .NET/C#?

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