How to Reliably Get a Process's File Path in C# and Avoid Win32Exceptions?

Avoiding Win32 Exception When Accessing Process.MainModule.FileName in C#

In C#, attempting to retrieve the FileName property of a process' MainModule may occasionally trigger a Win32Exception, especially when working with 64-bit platforms. To address this issue, Jeff Mercado's solution offers a reliable approach.

Adapted Code:

To simplify the process, here's an adaptation of Mercado's code to obtain the file path of a specific process:

string s = GetMainModuleFilepath(2011);

Implementation:

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;
}

This method queries the Windows Management Instrumentation (WMI) for the ExecutablePath property of the process with the specified process ID. If a matching process is found, its file path is returned. Otherwise, null is returned.

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