在将属性从一个类传递到另一个类时出错了

我有3类。一个是AuthenticateUser，它允许我设置和获取用户信息，如用户名和密码。在其他类中，AddEntryWindow是一个WinForm，我试图从AuthenticateUser显示密码和用户名属性的内容。第三个类是另一个WinForm类，它允许我为AuthenticateUser类设置用户名和密码。在这个简化的示例中，当我尝试从WinForm类显示用户名和密码时，我得到了一个空白消息框。此外，当使用AuthenticateUserWindow中的另一个消息框时，我能够获得属性的内容。

我怎么能解决这个问题，以便能够查看AddEntryWindow类属性的内容?

我一小时前一直在想这件事。

可能是一行:AuthenticateUser authenticateUser = new AuthenticateUser();创建了一个新对象。但它会去哪里呢?

addentrywindows .cs最可能出现的问题

using System;
using System.Windows.Forms;
// Needed to be used with StringBuilder
using System.Text;
// Needed to be used with ArrayList.
using System.Collections;
namespace Store_Passwords_and_Serial_Codes
{
    public partial class AddEntryWindow : Form
    {
        // Making authentication possible.
        AuthenticateUser authenticateUser = new AuthenticateUser();
        // Default constructor to initialize the form.
        public AddEntryWindow()
        {
            InitializeComponent();
        }
        private void btnAddEntry_Click(object sender, EventArgs e)
        {
            MessageBox.Show(authenticateUser.UserName + authenticateUser.Password);
        }
    }
}

AuthenticateUser.cs

using System;
namespace Store_Passwords_and_Serial_Codes
{
    class AuthenticateUser
    {
        private string userName, password;
        public AuthenticateUser()
        {
        }
        public AuthenticateUser(string userNamePassed, string passwordPassed)
        {
            this.userName = userNamePassed;
            this.password = passwordPassed;
        }
        public string UserName
        {
            get
            {
                return userName;
            }
            set
            {
                userName = value;
            }
        }
        public string Password
        {
            get
            {
                return password;
            }
            set
            {
                password = value;
            }
        }
    }
}

AuthenticateUserWindow.cs

using System;
using System.Windows.Forms;
namespace Store_Passwords_and_Serial_Codes
{
    public partial class AuthenticationWindow : Form
    {
        // Most important log in information needs to be entered
        // for encrypting and decrypting binary file.
        AuthenticateUser authenticateUser;
        public AuthenticationWindow()
        {
            InitializeComponent();
        }
        private void btnClose_Click(object sender, EventArgs e)
        {
            // Closing Authentication Window form.
            Close();
        }
        private void btnClear_Click(object sender, EventArgs e)
        {
            // Clearing text boxes txtUserName and txtPassword
            // after Clear Form button is clicked.
            txtUserName.Clear();
            txtPassword.Clear();
        }
        private void btnAuthenticate_Click(object sender, EventArgs e)
        {
            if (txtUserName.Text == string.Empty || txtPassword.Text == string.Empty)
            {
                MessageBox.Show("Please fill both information first.");
            }
            else
            {
                // Passing the values to object AuthenticateUser.
                authenticateUser = new AuthenticateUser(txtUserName.Text, txtPassword.Text);
                MessageBox.Show(authenticateUser.UserName + authenticateUser.Password);
                Close();
            }
        }
    }
}

问候。

public partial class AddEntryWindow : Form
{
    // Making authentication possible.
    AuthenticateUser authenticateUser = new AuthenticateUser();
    // Default constructor to initialize the form.
    public AddEntryWindow()
    {
        InitializeComponent();
    }
    private void btnAddEntry_Click(object sender, EventArgs e)
    {
        new AuthenticationWindow(authenticateUser).ShowDialog();
        MessageBox.Show(authenticateUser.UserName + authenticateUser.Password);
    }
}
...
public partial class AuthenticationWindow : Form
{
    // Most important log in information needs to be entered
    // for encrypting and decrypting binary file.
    AuthenticateUser authenticateUser;
    public AuthenticationWindow(AuthenticateUser user)
    {
        InitializeComponent();
        authenticateUser = user;
    }
    ...
    private void btnAuthenticate_Click(object sender, EventArgs e)
    {
        if (txtUserName.Text == string.Empty || txtPassword.Text == string.Empty)
        {
            MessageBox.Show("Please fill both information first.");
        }
        else
        {
            // Passing the values to object AuthenticateUser.
            authenticateUser.UserName = txtUserName.Text;
            authenticateUser.Password = txtPassword.Text;
            MessageBox.Show(authenticateUser.UserName + authenticateUser.Password);
            Close();
        }
    }
}