在 c# windows 申請表中登錄儀表板后如何獲取用戶名

Question

在我的 C# windows 應用程序中，我想在用戶登錄后在儀表板 window 中顯示用戶名。

提前致謝

這是我的登錄代碼：

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

將您的用戶名或用戶名（成功登錄后獲取用戶名）作為參數發送。 您可以將其用於以后的用戶交互。

Answer 2

您可以在EmployeeDashboard class 中定義一個公共變量並將用戶名傳遞給它

public class EmployeeDashboard{
public string username = "";

//your codes

}

然后像這樣重寫你的 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);
    }
}

您可以在主代碼中使用username