Saturday, November 18, 2006 9:08 AM bart

Which processes are running managed code and which version? (C# code snippet)

A question on the discussion groups a couple of weeks ago: how to find out which processes are running managed code, and which version of the CLR? Here's the answer:

using System;
using System.ComponentModel;
using System.Diagnostics;

class Proc
{
    public static void Main()
    {
        Console.WriteLine("{0,-20} {1}", "Process Name        ", ".NET version");
        Console.WriteLine("{0,-20} {1}", "--------------------", "-------------");

        foreach (Process p in Process.GetProcesses())
            try
            {
                foreach (ProcessModule m in p.Modules)
                    if (m.ModuleName.ToLower() == "mscorwks.dll")
                        Console.WriteLine("{0,-20} {1}", p.ProcessName, m.FileVersionInfo.ProductVersion);
            }
            catch (Win32Exception) { }
    }
}

On my machine it prints:

Process Name         .NET version
-------------------- -------------
WINWORD              2.0.50727.112
OUTLOOK              2.0.50727.112
dexplore             2.0.50727.112
WindowsLiveWriter    2.0.50727.112
devenv               2.0.50727.112
iexplore             2.0.50727.112
proc                 2.0.50727.112

Notice the code can be improved quite a bit, as other exceptions might arise (InvalidOperationException when a process has exited during iteration; yes, this happens sometimes). So I only caught Win32Exception (lots of Access Denied errors can occur, especially on Windows Vista) to avoid the criticism "do never catch all" (which might be appropriate in here).

The cmdline equivalent of this is:

C:\temp>tasklist /FI "MODULES eq mscoree.dll"

Image Name                     PID Session Name        Session#    Mem Usage
========================= ======== ================ =========== ============
iexplore.exe                  4748 Console                    1     42.092 K
OUTLOOK.EXE                   1524 Console                    1     94.012 K
devenv.exe                    1424 Console                    1    157.600 K
WINWORD.EXE                   7476 Console                    1     44.288 K
dexplore.exe                  9376 Console                    1     66.300 K
WindowsLiveWriter.exe        11728 Console                    1     48.128 K

or

C:\temp>tasklist /M mscoree.dll

Image Name                     PID Modules
========================= ======== ============================================
iexplore.exe                  4748 mscoree.dll
OUTLOOK.EXE                   1524 mscoree.dll
devenv.exe                    1424 mscoree.dll
WINWORD.EXE                   7476 mscoree.dll
dexplore.exe                  9376 mscoree.dll
WindowsLiveWriter.exe        11728 mscoree.dll

Enjoy!

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