public Privilege(string privilegeName)
{
if (privilegeName == null)
{
throw new ArgumentNullException("privilegeName");
}
this.luid = LuidFromPrivilege(privilegeName);
}
private static NativeMethods.LUID LuidFromPrivilege(string privilege)
{
NativeMethods.LUID luid;
luid.LowPart = 0;
luid.HighPart = 0;
//
// Look up the privilege LUID inside the cache
//
RuntimeHelpers.PrepareConstrainedRegions();
try
{
privilegeLock.AcquireReaderLock(Timeout.Infinite);
if (luids.Contains(privilege))
{
luid = (NativeMethods.LUID)luids[privilege];
privilegeLock.ReleaseReaderLock();
}
else
{
privilegeLock.ReleaseReaderLock();
if (false == NativeMethods.LookupPrivilegeValue(null, privilege, ref luid))
{
int error = Marshal.GetLastWin32Error();
if (error == NativeMethods.ERROR_NOT_ENOUGH_MEMORY)
{
throw new OutOfMemoryException();
}
else if (error == NativeMethods.ERROR_ACCESS_DENIED)
{
throw new UnauthorizedAccessException("Caller does not have the rights to look up privilege local unique identifier");
}
else if (error == NativeMethods.ERROR_NO_SUCH_PRIVILEGE)
{
throw new ArgumentException(
string.Format("{0} is not a valid privilege name", privilege),
"privilege");
}
else
{
throw new Win32Exception(error);
}
}
privilegeLock.AcquireWriterLock(Timeout.Infinite);
}
}
finally
{
if (privilegeLock.IsReaderLockHeld)
{
privilegeLock.ReleaseReaderLock();
}
if (privilegeLock.IsWriterLockHeld)
{
if (!luids.Contains(privilege))
{
luids[privilege] = luid;
privileges[luid] = privilege;
}
privilegeLock.ReleaseWriterLock();
}
}
return(luid);
}
