為什么我的標簽不會更改

Question

當我運行我的代碼時，標簽保持不變，但是當我對其進行調試時，我可以看到文本更改，然后在運行完成時更改回

public void getData(string a) 
{
    SqlConnection conn = new SqlConnection(@"Data Source=MASSI\FABERSERVER;Initial Catalog=Data.mdf;Integrated Security=True");
    conn.Open();
    SqlCommand command = new SqlCommand("Select UserID,UserName,Email FROM Login Where UserName= '" + a + "'", conn);
    SqlDataReader reader = command.ExecuteReader();

    while (reader.Read())
    {
        label1.Text = reader["UserID"].ToString();
        label2.Text = reader["UserName"].ToString();
        label3.Text = reader["Email"].ToString();
    }

    conn.Close();
}

Answer 1

以防萬一，請嘗試以下操作：

public void getData(string a) {
        SqlConnection conn = new SqlConnection(@"Data Source=MASSI\FABERSERVER;Initial Catalog=Data.mdf;Integrated Security=True");
        conn.Open();
        SqlCommand command = new SqlCommand("Select UserID,UserName,Email FROM Login Where UserName= '" + a + "'", conn);
        SqlDataReader reader = command.ExecuteReader();

        string id, name, email;

        while (reader.Read())
        {
            id = reader["UserID"].ToString();
            name = reader["UserName"].ToString();
            email = reader["Email"].ToString();

        }
        conn.Close();

        label1.Text = id;
        label2.Text = name;
        label3.Text = email;
    }
}

希望能幫助到你。