How to check COM dll is registered or not with C#?

Question

I need to check if msdia100.dll is registered on a computer system that I\'m running in order to register the dll with the command regsvr32.exe. How can I do th

Answer 1

Assuming you know the CLSID of the COM dll, you can just check if there's a key with that CLSID on HKEY_CLASSES_ROOT\CLSID\{CLSID-of-your-COM-component} or HKEY_CLASSES_ROOT\Wow6432Node\CLSID\{CLSID-of-your-COM-component} (Wow6432Node => 32-bit COM registered on a 64-bit machine)

e.g.

private bool IsAlreadyRegistered()
{
    using (var classesRootKey = Microsoft.Win32.RegistryKey.OpenBaseKey(
           Microsoft.Win32.RegistryHive.ClassesRoot, Microsoft.Win32.RegistryView.Default))
    {
        const string clsid = "{12345678-9012-3456-7890-123456789012}";

        var clsIdKey = classesRootKey.OpenSubKey(@"Wow6432Node\CLSID\" + clsid) ??
                        classesRootKey.OpenSubKey(@"CLSID\" + clsid);

        if (clsIdKey != null)
        {
            clsIdKey.Dispose();
            return true;
        }

        return false;
    }
}