void IDisposable.Dispose()
{
if (!_disposed)
{
_disposed = true;
if (this != _current)
{
throw new InvalidOperationException("Disposed out of order.");
}
try
{
// attempt to terminate the session
TerminateSession();
}
finally
{
// even if it fails, we are still disposing of this scope, so we set the head
// to point to the parent and revert the Thread.CurrentPrincipal
_current = _parent;
Thread.CurrentPrincipal = _previousPrincipal;
}
}
}
/// <summary>
/// Creates a new user session based on specified credentials, and constructs an instance of this
/// class for that user session.
/// </summary>
/// <remarks>
/// The user session is terminated when this instance is disposed.
/// </remarks>
/// <param name="userName"></param>
/// <param name="application"></param>
/// <param name="hostName"></param>
/// <param name="password"></param>
public AuthenticationScope(string userName, string application, string hostName, string password)
{
_userName = userName;
_application = application;
_hostName = hostName;
_principal = InitiateSession(password);
// if the session was successfully initiated (no exception thrown), then
// set the thread principal and establish this as the current scope
_previousPrincipal = Thread.CurrentPrincipal;
Thread.CurrentPrincipal = _principal;
_parent = _current;
_current = this;
}
