c# - 如何关闭 this.form

Question

我有 3 个类:Form1、LoginForm 和程序。

程序包含我的主要方法，然后运行 ​​loginform，如果满足登录表单中的条件，则运行 form1。

我想让它做的是在显示 form1 之前隐藏 loginform。

因为我不能使用 loginform.hide()，我该怎么做？

代码如下:

namespace RepSalesNetAnalysis
{
public partial class LoginForm : Form
{
    public  bool letsGO = false;
    public LoginForm()
    {
        InitializeComponent();
    }

    private static DataTable LookupUser(string Username)
    {
        const string connStr = "Server=10asaf;" +
                            "Database=dfafa;" +
                            "uid=bufaf;" +
                            "pwd=dridfsdf;" +
                            "Connect Timdf0;";

        //"Data Source=apex2006sql;Initial Catalog=Leather;Integrated Security=True;";

        const string query = "Select password From dbo.UserTable (NOLOCK) Where UserName = @UserName";
        DataTable result = new DataTable();
        using (SqlConnection conn = new SqlConnection(connStr))
        {
            conn.Open();
            using (SqlCommand cmd = new SqlCommand(query, conn))
            {
                cmd.Parameters.Add("@UserName", SqlDbType.VarChar).Value = Username;
                using (SqlDataReader dr = cmd.ExecuteReader())
                {
                    result.Load(dr);
                }
            }
        }
        return result;
    }

    private void buttonLogin_Click(object sender, EventArgs e)
    {

        if (string.IsNullOrEmpty(textUser.Text))
        {
            //Focus box before showing a message
            textUser.Focus();
            MessageBox.Show("Enter your username", this.Text, MessageBoxButtons.OK, MessageBoxIcon.Information);
            //Focus again afterwards, sometimes people double click message boxes and select another control accidentally
            textUser.Focus();
            return;
        }
        else if (string.IsNullOrEmpty(textPass.Text))
        {
            textPass.Focus();
            MessageBox.Show("Enter your password", this.Text, MessageBoxButtons.OK, MessageBoxIcon.Information);
            textPass.Focus();
            return;
        }

        //OK they enter a user and pass, lets see if they can authenticate
        using (DataTable dt = LookupUser(textUser.Text))
        {
            if (dt.Rows.Count == 0)
            {
                textUser.Focus();
                MessageBox.Show("Invalid username.", this.Text, MessageBoxButtons.OK, MessageBoxIcon.Error);
                textUser.Focus();
                return;
            }
            else
            {
                string dbPassword = Convert.ToString(dt.Rows[0]["Password"]);
                string appPassword = Convert.ToString(textPass.Text); //we store the password as encrypted in the DB
                //MessageBox.Show
                Console.WriteLine(string.Compare(dbPassword, appPassword));

                if (string.Compare(dbPassword, appPassword) == 0)
                {
                     DialogResult = DialogResult.OK;
                     this.Close();
                }
                else
                {
                    //You may want to use the same error message so they can't tell which field they got wrong
                    textPass.Focus();
                    MessageBox.Show("Invalid Password", this.Text, MessageBoxButtons.OK, MessageBoxIcon.Information);
                    textPass.Focus();
                    return;
                }
            }
        }

    }
}

我错过了什么吗？这是我的主要类(class)；

namespace RepSalesNetAnalysis
{
static class Program
{
    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        LoginForm fLogin = new LoginForm();
        if (fLogin.ShowDialog() == DialogResult.OK)
        {
            Application.Run(new Form1());
        }
        else
        {
            Application.Exit();
        }
    }
}
}

Answer 1

Steven 这完全是错误的。

还有其他方法可以正确地使用 Program 类的 Main 方法来创建登录表单，并且仅当登录成功时才实例化并显示主申请表。

查看此问题/答案以获取详细信息和示例:How can I close a login form and show the main form without my application closing?

您实际上需要这种方法:

static void Main()
{
    LoginForm fLogin = new LoginForm();
    if (fLogin.ShowDialog() == DialogResult.OK)
    {
        Application.Run(new MainForm());
    }
    else
    {
        Application.Exit();
    }
}