Identify the w3wp System.Diagnostics.Process for a given application pool - iis

Question

I got few web sites running on my server.
I have a "diagnostic" page in an application that shows the amount of memory for the current process (very useful).
Now this app is 'linked' to another app, and I want my diagnostic page to be able to display the amot of memory for another w3wp process.
To get the amount of memory, I use a simple code :
var process = Process.GetProcessesByName("w3wp");
string memory = this.ToMemoryString(process.WorkingSet64);
How can I identify my second w3wp process, knowing its application pool ?
I found a corresponding thread, but no appropriate answer :
Reliable way to see process-specific perf statistics on an IIS6 app pool
Thanks

Answer 1

You could use WMI to identify to which application pool a given w3wp.exe process belongs:
var scope = new ManagementScope(#"\\YOURSERVER\root\cimv2");
var query = new SelectQuery("SELECT * FROM Win32_Process where Name = 'w3wp.exe'");
using (var searcher = new ManagementObjectSearcher(scope, query))
{
foreach (ManagementObject process in searcher.Get())
{
var commandLine = process["CommandLine"].ToString();
var pid = process["ProcessId"].ToString();
// This will print the command line which will look something like that:
// c:\windows\system32\inetsrv\w3wp.exe -a \\.\pipe\iisipm49f1522c-f73a-4375-9236-0d63fb4ecfce -t 20 -ap "NAME_OF_THE_APP_POOL"
Console.WriteLine("{0} - {1}", pid, commandLine);
}
}

Answer 2

You can also get the PID using the IIS ServerManager component; way, if you need to access it in code, without redirecting and parsing console output;
public static int GetIISProcessID(string appPoolName)
{
Microsoft.Web.Administration.ServerManager serverManager = new
Microsoft.Web.Administration.ServerManager();
foreach (WorkerProcess workerProcess in serverManager.WorkerProcesses)
{
if (workerProcess.AppPoolName.Equals(appPoolName))
return workerProcess.ProcessId;
}
return 0;
}