Question

因此情况是用户已使用凭据登录，并且当他们将商品添加到购物车时，我希望将全名从Account.cs转移到ProductGUI.cs < / p>

这是我尝试过的方法，但它会提示出一个空的控制台声明。

很抱歉，如果我问一个重复的问题，但我需要帮助来弄清楚如何专门解决这个问题。

Account.cs

    private string fullname;
    private string username;
    private string email;
    private string password;

    public Account(string fullname, string username, string email, string password)
    {
        this.fullname = fullname;
        this.username = username;
        this.email = email;
        this.password = password;
    }

    public string Fullname
    {
        get
        {
            return fullname;
        }
        set
        {
            fullname = value;
        }
    }

ProductGUI.cs

private void addToCartButton_Click(object sender, EventArgs e)
    {
        // I believe I'm creating a new account based another question, but how do i pass the information without creating a new account.
        Account a = new Account();
        Console.WriteLine(a.Fullname);
    }

LoginGUI.cs

private void signinButton_Click(object sender, EventArgs e)
    {
        bool temp = false;
        foreach (DataRow row in dt.Rows)
        {
            if (row["Username"].ToString() == usernameTextbox.Text && row["Password"].ToString() == passwordTextbox.Text)
            {
                string fullname = row["Fullname"].ToString();
                string username = row["Username"].ToString();
                string email = row["Email"].ToString();
                string password = row["Password"].ToString();

                // I've saved the information into account.
                acc = new Account(fullname, username, email, password);
                temp = true;
            }
        }
        if (temp)
        {
            MessageBox.Show("Welcome to Anime Fanatic.\n Enjoy your stay!");
            this.Hide();
            mainPageGUI mainPage = new mainPageGUI();
            mainPage.ShowDialog();
        }
        else
        {
            MessageBox.Show("You have entered an incorrect Username or Password.\n Please try again!");
        }
    }

Answer 1

您必须使您的Account实例为Login-GUI和Product-GUI都知道。最简单（也是最丑陋，最不推荐）的方法是将其设为静态：

class LoginGUI
{
    public static Account acc;

    [...]
}

class ProductGUI
{
    private void addToCartButton_Click(object sender, EventArgs e)
    {
        Console.WriteLine(LoginGUI.acc.Fullname);
    }

    [...]
}

但实际上，对单例模式有一个很好的阅读。 依赖注入也可能有所帮助。

Answer 2

您可以通过创建fullname的静态属性来实现此目的。它们对于抽象程序中的全局数据非常有用。

从另一个类访问变量c＃

2 个答案: