开发用于处理登录的 NetLogic

#region Using directives
using System;
using UAManagedCore;
using OpcUa = UAManagedCore.OpcUa;
using FTOptix.HMIProject;
using FTOptix.UI;
using FTOptix.NativeUI;
using FTOptix.Core;
using FTOptix.CoreBase;
using FTOptix.NetLogic;
#endregion

public class LoginFormNetLogic : BaseNetLogic
{
    public override void Start()
    {
        // Insert code to be executed when the user-defined logic is started
    }

    public override void Stop()
    {
        // Insert code to be executed when the user-defined logic is stopped
    }
    
    [ExportMethod]
    public void Login(string username, string password)
    {
        if (!PerformLogin(username, password))
        {
            // Set incorrect login message
            var messageVariable = LogicObject.GetVariable("Message");
            messageVariable.Value = "Incorrect login";
            return;
        }

        // Check the correct type of PanelLoader
        PanelLoader panelLoader = (PanelLoader)Owner.Owner;
        if (panelLoader == null)
        {
            Log.Error(panelLoader + " is not a PanelLoader");
            return;
        }

        // Retrieve Panel variable
        var panelVariable = (NodeId)LogicObject.GetVariable("Panel").Value;

        if (panelVariable == NodeId.Empty)
        {
            Log.Error("Panel variable is empty");
            return;
        }

        // Perform ChangePanel
        panelLoader.ChangePanel(panelVariable, NodeId.Empty);
    }

    private bool PerformLogin(string username, string password)
    {
        return Session.ChangeUser(username, password);
    }
}