How to Access Process.MainModule.FileName Without a Win32Exception?

Accessing Process.MainModule.FileName Without a Win32 Exception

When retrieving the path to running processes using the Process.GetProcessById method, you may encounter a Win32Exception that prevents you from accessing the MainModule.FileName property. This exception arises when attempting to retrieve module information from certain processes.

Solution:

To circumvent this issue, you can employ a method outlined by Jeff Mercado. The following code demonstrates how to obtain the full filepath of a specific process:

string s = GetMainModuleFilepath(2011);

Here's the implementation of the GetMainModuleFilepath method:

private string GetMainModuleFilepath(int processId)
{
    string wmiQueryString = "SELECT ProcessId, ExecutablePath FROM Win32_Process WHERE ProcessId = " + processId;
    using (var searcher = new ManagementObjectSearcher(wmiQueryString))
    {
        using (var results = searcher.Get())
        {
            ManagementObject mo = results.Cast<ManagementObject>().FirstOrDefault();
            if (mo != null)
            {
                return (string)mo["ExecutablePath"];
            }
        }
    }
    return null;
}

By leveraging the Windows Management Instrumentation (WMI), you can query process information and extract the executable path without triggering the Win32Exception.

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