RegistryKey last write time

Question

Using Microsoft.Win32.RegistryKey (or any related classes), how can I query the last write time of a registry key?

Answer 1

You will need to use P/Invoke to make a call to the Win32 API:

MSDN: RegQueryInfoKey function

Signature from pinvoke.net:

[DllImport("advapi32.dll", EntryPoint="RegQueryInfoKey", CallingConvention=CallingConvention.Winapi, SetLastError=true)]
extern private static int RegQueryInfoKey(
    UIntPtr hkey,
    out StringBuilder lpClass,
    ref uint lpcbClass,
    IntPtr lpReserved,
    out uint lpcSubKeys,
    out uint lpcbMaxSubKeyLen,
    out uint lpcbMaxClassLen,
    out uint lpcValues,
    out uint lpcbMaxValueNameLen,
    out uint lpcbMaxValueLen,
    out uint lpcbSecurityDescriptor,
    IntPtr lpftLastWriteTime);