How to Avoid Win32Exceptions When Accessing Process.MainModule.FileName in C#?

Accessing Process.MainModule.FileName in C#: Avoiding Win32 Exceptions

When attempting to access the Process.MainModule.FileName property in C#, developers may encounter a Win32Exception. This exception is typically encountered while enumerating process modules on a 64-bit platform, despite recompiling the application for 32-bit (x86) or AnyCPU environments.

The code in question often takes the following form:

Process p = Process.GetProcessById(2011);
string s = proc_by_id.MainModule.FileName;

To address this issue, developers can leverage the code provided by Jeff Mercado, as suggested in the reference answer. This code has been adapted slightly to retrieve the filepath of a specific process:

string s = GetMainModuleFilepath(2011);

The GetMainModuleFilepath method utilizes Windows Management Instrumentation (WMI) to query the Win32_Process class for the ExecutablePath property:

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 utilizing this approach, developers can circumvent the Win32Exception and successfully retrieve the MainModule.FileName for the specified process.

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