C# 向数据库提交数据时未显示消息框

当我填写注册表单，然后单击提交，如果数据正确，它将成功添加到数据库中，但它没有显示消息Registration success full

这是我的提交按钮

private void Submit_btn_Click(object sender, EventArgs e)
    {
        string phonetext = Phone_txt.Text;
        string myregex = "[\\d\\d\\d\\d\\d\\d\\d\\d\\d\\d]";  

        Match look = Regex.Match(phonetext, myregex);

        if (UserName_txt.Text != "" && mask1_password_txt.Text != "" &&Email_txt.Text!= "" && Phone_txt.Text != "" && FName_txt.Text != "" && LName_txt.Text != "" &&Address_txt.Text != "")
        {


            if (look.Success && Phone_txt.Text.Length == 10) // if regex success & phone number has 10 digits
            {
                 Classes.Quaries qu = new Classes.Quaries();
                qu.insertIntoSignup(UserName_txt.Text, mask1_password_txt.Text, FName_txt.Text, LName_txt.Text, Address_txt.Text, Phone_txt.Text, Email_txt.Text);
            }
            else
            {
                MessageBox.Show("Invalid Phone Number");
            }
        }
        else
        {
            MessageBox.Show("All Fields Must Be Filled ", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

    }

这就是方法

public void insertIntoSignup(string username, string password, string firstname, string lastname, string address, string phone, string email )
    {
        try
        {

            sql_quary = "Insert Into my_project_data.signup(UserName,Password,FirstName,LastName,Address,Phone,Email) Values('" + username + "','" + password + "','" + firstname + "','" + lastname + "','" + address + "','" + phone + "','" + email + "')";
            string dbuser = "Select UserName From my_project_data.signup where UserName = '" + username + "'";  //check whether username already excistes

            openConnection();
            cmd = new MySqlCommand(dbuser, conn);
            datar = cmd.ExecuteReader();
            int count1 = 0;

            while (datar.Read())
            {
                count1 += 1;
            }
            datar.Close();


            if(count1 == 1)
            {
                System.Windows.Forms.MessageBox.Show("UserName Already Exists Please Choose Another UserName");
            }
            else if (count1 == 0)
            {
                cmd = new MySqlCommand(sql_quary, conn);
                datar = cmd.ExecuteReader();

                while (datar.Read())
                {
                    System.Windows.Forms.MessageBox.Show("Registration Sucessfull "); //This message is not showing
                }
                datar.Close();
            }
            else
            {
                System.Windows.Forms.MessageBox.Show("Something is terribally wrong");
            }

        }
        catch (Exception ex)
        {
            System.Windows.Forms.MessageBox.Show("Ooooops Error " + ex.Message);
        }

        finally
        {
            closeConnection();
        }
    }

---

你有点糊涂，伙计。您正在对Insert语句执行读取器

 cmd = new MySqlCommand(sql_quary, conn);
 datar = cmd.ExecuteReader();

sql_quary在哪里

 sql_quary = "Insert Into my_project_data.signup(UserName,Password,FirstName,LastName,Address,Phone,Email) Values('" + username + "','" + password + "','" + firstname + "','" + lastname + "','" + address + "','" + phone + "','" + email + "')";

您需要首先执行insert语句，通常是通过

cmd.ExecuteNonQuery();

目前，您正在尝试读取insert语句的结果，在本例中，情况并非如此

while (datar.Read())
{
    System.Windows.Forms.MessageBox.Show("Registration Sucessfull "); 
}

从不执行

我也有这个方法

public void insertIntoSignup(string username, string password, string firstname, string lastname, string address, string phone, string email )

将结果变量返回到Ui并在那里执行消息。i、 e.返回一个整数或更好的枚举：

public int insertIntoSignup(string username, string password, string firstname, string lastname, string address, string phone, string email )

然后根据该值在Ui中显示一条或另一条消息

---

将消息放入while循环意味着，如果阅读器返回多个结果行，消息将持续弹出，每行一次。可能不是您想要的。

在loopIt工作时将您的Messagebox放在外面谢谢您的帮助