在 c# windows 申请表中登录仪表板后如何获取用户名

Question

在我的 C# windows 应用程序中，我想在用户登录后在仪表板 window 中显示用户名。

提前致谢

这是我的登录代码：

private void loginbt_Click(object sender, EventArgs e)
{
    try
    {
        string qry = "SELECT empid,password FROM login WHERE (empid='" + empusernametxt.Text + "'and password='" + passwordtxt.Text + "')";
        OleDbCommand cmd = new OleDbCommand(qry, dbc.cn);
        OleDbDataReader dr = cmd.ExecuteReader();
        if (dr.Read())
        {
            dbc.cn.Close();
            MessageBox.Show("Login Successfully","Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
            EmployeeDashboard emp = new EmployeeDashboard();
            emp.Show();
         }
         else if(empusernametxt.Text=="admin" && passwordtxt.Text=="admin" )
         {
            dbc.cn.Close();
            MessageBox.Show("Login Successfully","Success",MessageBoxButtons.OK,MessageBoxIcon.Information);
            AdminDashborad admin = new AdminDashborad();
            admin.Show();
         }
         else
         {
            MessageBox.Show("Username or Password Incorrect","Warning",MessageBoxButtons.OK,MessageBoxIcon.Warning);
            empusernametxt.Focus();
            empusernametxt.Text.Equals("");
            passwordtxt.Text.Equals("");
         }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}

Answer 1

将您的用户名或用户名（成功登录后获取用户名）作为参数发送。 您可以将其用于以后的用户交互。

Answer 2

您可以在EmployeeDashboard class 中定义一个公共变量并将用户名传递给它

public class EmployeeDashboard{
public string username = "";

//your codes

}

然后像这样重写你的 loginbt_Click() ：

private void loginbt_Click(object sender, EventArgs e)
{
    try
    {
        string qry = "SELECT empid,password FROM login WHERE (empid='" + empusernametxt.Text + "'and password='" + passwordtxt.Text + "')";
        OleDbCommand cmd = new OleDbCommand(qry, dbc.cn);
        OleDbDataReader dr = cmd.ExecuteReader();
        if (dr.Read())
        {
            dbc.cn.Close();
            MessageBox.Show("Login Successfully","Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
            EmployeeDashboard emp = new EmployeeDashboard()
            {
               username = empusernametxt.Text
            };
            emp.Show();
         }
         else if(empusernametxt.Text=="admin" && passwordtxt.Text=="admin" )
         {
            dbc.cn.Close();
            MessageBox.Show("Login Successfully","Success",MessageBoxButtons.OK,MessageBoxIcon.Information);
            AdminDashborad admin = new AdminDashborad();
            admin.Show();
         }
         else
         {
            MessageBox.Show("Username or Password Incorrect","Warning",MessageBoxButtons.OK,MessageBoxIcon.Warning);
            empusernametxt.Focus();
            empusernametxt.Text.Equals("");
            passwordtxt.Text.Equals("");
         }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}

您可以在主代码中使用username