How to pass to a Generic and Pass from a Generic to another class?

Question

When I log into my application, I pass the cUserEntity class which holds all the details of the logged in user, including UserID and Username, to the Dashboard form. From here, I can continue to pass the details around from class to class and form to form. For example (Ignore the generic bit in this example):

Login:

 xamlDashboard Manager = new xamlDashboard(_loggedInUser);
 Generic Gen = new Generic(_loggedInUser);
 Manager.Show();

Dashboard:

cUserEntity _loggedInUser;

  public xamlDashboard(cUserEntity loggedInUser)
    {

        InitializeComponent();

        _loggedInUser = loggedInUser;
    }

However, I have a Generic.Xaml page which creates a button at the top of every window. Behind the Generic.xaml is a Generic class, which holds the click_event for the created button. The click_event opens a new window to another form.

Now, I need that other form to have the logged in user details, and to do that, I assume I need to pass to the Generic.Xaml and then pass from there to the new form via the click_event. However, as I've read up and noticed, it doesn't seem to be possible as you can't pass a type to a Generic during runtime.

What I hoped to achieved (which failed):

public partial class Generic
{
    cUserEntity _loggedInUser;

    public Generic(cUserEntity loggedInUser)
    {
        _loggedInUser = loggedInUser;
    }

    private void btnHelp_Click(object sender, RoutedEventArgs e)
    {
        xamlHelp help = new xamlHelp(_loggedInUser);
        help.Show();
    }
}

Therefore, what is the best and most efficient method to be able to do this, and would appreciate examples, if possible.

Answer 1

It would be alot simpler to create a singleton object to store your logged in user...

public class UserAccount
{
   private static User _currentUser;

   private UserAccount() {}

   public static User CurrentUser
   {
      set
      {
         _currentUser = value;
      }

      get 
      {
         return _currentUser;
      }
   }
}

Then after login you would do this...

// Set the current User
UserAccount.CurrentUser = user;

Then in any class you need the currently logged in user... you could do...

var user = UserAccount.CurrentUser;

Obviously you would need to implement your own business rules around this but the concept is what I am trying to get across here, a static single instance of the user that can be accessed from anywhere.