Question

我有两个项目。一个称为Main，另一个称为UserAuth。除非用户通过UserAuth，否则我不想运行Main。我知道我的代码存在很多问题，这就是我寻求帮助的原因。我想要做的是从此LoginForm返回userAuthenticated。我无法弄清楚如何去做。我创建了一个public变量userAuthenticated，但我无法访问它。这是我的代码：

namespace UserAuth
{
  public partial class LoginForm : Form
  {
    public bool userAuthenticated;

    private int attempts = 0;

    public bool LoginForm()   // Error  'LoginForm': member names cannot be the same as their enclosing type    UserAuth    
    {
        InitializeComponent();
        return (userAuthenticated);
    }

    private void btnLogin_Click(object sender, EventArgs e)
    { // authenticate user -- works fine }

被叫：

    LoginForm lf = new LoginForm();
    lf.Show();

任何帮助都将不胜感激。

Answer 1

我会删除所有的全局变量，我只能使用模态对话框所期望的预定义模式。换句话说，我会通过Winforms设计器将btnLogin的属性DialogResult设置为DialogResult.Cancel，然后修改btnLogin_Click中的代码

// this is the form constructor, cannot return anything here
public LoginForm()   
{
    InitializeComponent();
}
private void btnLogin_Click(object sender, EventArgs e)
{ 
    // this method contains your logic to authenticate the user
    // the method returns true if the user is ok or false if not
    bool result = AuthenticateUser();

    // If the user is authenticated close the login form setting OK
    // as the return value
    if(result)
        this.DialogResult = DialogResult.OK;
    // else the return from the form will be DialogResult.Cancel as 
    // set in the button's DialogResult property
}

现在调用登录表单的代码应该只是

using(LoginForm fLogin = new LoginForm())
{
    if(DialogResult.OK == fLogin.ShowDialog())
    {
         MessageBox.Show("Login OK");
    }
    else
    {
         MessageBox.Show("Login failed");
    }
}

无法在C＃中从Auth表单返回变量

1 个答案: