我无法停止我的网络应用程序向我的数据库发送值答案

【问题标题】：I can't stop my web app sending values to my database我无法停止我的网络应用程序向我的数据库发送值
【发布时间】：2017-04-24 04:20:37
【问题描述】：

所以我正在尝试使用 Visual Studio 在 C# 中创建一个 asp.net Web 应用程序。我的一个网页有两个单选按钮（添加父级和添加子级），根据选择的一个，许多文本框将变得可见并且必须填写以进行注册。我已成功将提交按钮连接到我的数据库，并且在文本框中输入的值正在正确地发送到我数据库中相应的“父母”和“孩子”表。

我现在遇到的问题是我正在尝试设置它，以便所有文本框中都必须有一个条目，如果没有，则会出现一个消息框，告诉用户他们需要填写所有字段。我实际上已经设法让它工作，我遇到的问题是，即使它告诉你需要填写所有字段，它仍然会将填写的值发送到数据库。

我想知道如果没有填写任何文本框，是否有办法不打开数据库连接。我在下面附上了我的代码，谢谢:)。

protected void submitBtn_Click(object sender, EventArgs e)
    {
        SqlConnection connect = new SqlConnection("Data  Source=THEBEAST;Initial Catalog=newregDB;Integrated Security=True;Pooling=False");
        {
            if (firstNameBox.Text == "" || surnameBox.Text == "" || dayDobList.Text == "" || monthDobList.Text == "" || yearDobList.Text == "" || genderList.Text == "" || postcodeBox.Text == "" || teleBox.Text == "" || emailBox.Text == "" || userBox.Text == "" || passwordBox.Text == "")
                Response.Write("<script>alert('Please ensure all fields have an entry');</script>");

            if (parentRadBtn.Checked)

            {
                SqlCommand pa = new SqlCommand("INSERT INTO parent(parentID, firstname, surname, postcode, telephone, email, password) VALUES (@parentID, @firstname, @surname, @postcode, @telephone, @email, @password)", connect);
                pa.Parameters.AddWithValue("@parentID", userBox.Text);
                pa.Parameters.AddWithValue("@firstname", firstNameBox.Text);
                pa.Parameters.AddWithValue("@surname", surnameBox.Text);
                pa.Parameters.AddWithValue("@postcode", postcodeBox.Text);
                pa.Parameters.AddWithValue("@telephone", teleBox.Text);
                pa.Parameters.AddWithValue("@email", emailBox.Text);
                pa.Parameters.AddWithValue("@password", passwordBox.Text);

                connect.Open();
                pa.ExecuteNonQuery();
                connect.Close();

                if (IsPostBack)
                {
                    userBox.Text = "";
                    firstNameBox.Text = "";
                    surnameBox.Text = "";
                    postcodeBox.Text = "";
                    teleBox.Text = "";
                    emailBox.Text = "";
                    passwordBox.Text = "";
                }
            }
            else if (childRadBtn.Checked)
            {
                SqlCommand ca = new SqlCommand("INSERT INTO children(childID, firstname, dob, gender, password) VALUES (@childID, @firstname, @dob, @gender, @password)", connect);
                ca.Parameters.AddWithValue("@childID", userBox.Text);
                ca.Parameters.AddWithValue("@firstname", firstNameBox.Text);
                ca.Parameters.AddWithValue("@dob", dayDobList.Text + monthDobList.Text + yearDobList.Text);
                ca.Parameters.AddWithValue("@gender", genderList.Text);
                ca.Parameters.AddWithValue("@password", passwordBox.Text);

                connect.Open();
                ca.ExecuteNonQuery();
                connect.Close();

                if (IsPostBack)
                {
                    userBox.Text = "";
                    firstNameBox.Text = "";
                    dayDobList.Text = "";
                    monthDobList.Text = "";
                    yearDobList.Text = "";
                    genderList.Text = "";
                    passwordBox.Text = "";
                }
            }
        }

【问题讨论】：

哈哈@I can't stop my web app sending values to my database。它变得有知觉了！
if...else 是编程的 101。
我知道这听起来很荒谬，但在我的脑海中听起来更好。我知道可能有另一种更简单的方法，但我似乎找不到它！
需要更好地掌握 If/Else 的工作原理。 msdn.microsoft.com/en-us/library/5011f09h.aspx
天哪，好尴尬。我希望我能让史蒂夫成为答案，否则我错过了制作父单选按钮。那解决了它。谢谢你:)

标签： c# sql asp.net database visual-studio

【解决方案1】：

您需要研究验证方案，但我不会深入探讨，因为这不是您所要求的。

您需要在“if”中添加一个 else 案例，以防止执行其余代码：

if (firstNameBox.Text == "" || surnameBox.Text == "" || dayDobList.Text == "" || monthDobList.Text == "" || yearDobList.Text == "" || genderList.Text == "" || postcodeBox.Text == "" || teleBox.Text == "" || emailBox.Text == "" || userBox.Text == "" || passwordBox.Text == "")
            Response.Write("<script>alert('Please ensure all fields have an entry');</script>");
else
{
    //Put the rest of the code here.
}

【讨论】：

【解决方案2】：

 protected void submitBtn_Click(object sender, EventArgs e)
 {
    SqlConnection connect = new SqlConnection("Data  Source=THEBEAST;Initial Catalog=newregDB;Integrated Security=True;Pooling=False");
    {
        if (firstNameBox.Text == "" || surnameBox.Text == "" || dayDobList.Text == "" || monthDobList.Text == "" || yearDobList.Text == "" || genderList.Text == "" || postcodeBox.Text == "" || teleBox.Text == "" || emailBox.Text == "" || userBox.Text == "" || passwordBox.Text == "")
            Response.Write("<script>alert('Please ensure all fields have an entry');</script>");
        else
        {
            if (parentRadBtn.Checked)
            {
                SqlCommand pa = new SqlCommand("INSERT INTO parent(parentID, firstname, surname, postcode, telephone, email, password) VALUES (@parentID, @firstname, @surname, @postcode, @telephone, @email, @password)", connect);
                pa.Parameters.AddWithValue("@parentID", userBox.Text);
                pa.Parameters.AddWithValue("@firstname", firstNameBox.Text);
                pa.Parameters.AddWithValue("@surname", surnameBox.Text);
                pa.Parameters.AddWithValue("@postcode", postcodeBox.Text);
                pa.Parameters.AddWithValue("@telephone", teleBox.Text);
                pa.Parameters.AddWithValue("@email", emailBox.Text);
                pa.Parameters.AddWithValue("@password", passwordBox.Text);

                connect.Open();
                pa.ExecuteNonQuery();
                connect.Close();

                if (IsPostBack)
                {
                    userBox.Text = "";
                    firstNameBox.Text = "";
                    surnameBox.Text = "";
                    postcodeBox.Text = "";
                    teleBox.Text = "";
                    emailBox.Text = "";
                    passwordBox.Text = "";
                }
            }
            else if (childRadBtn.Checked)
            {
                SqlCommand ca = new SqlCommand("INSERT INTO children(childID, firstname, dob, gender, password) VALUES (@childID, @firstname, @dob, @gender, @password)", connect);
                ca.Parameters.AddWithValue("@childID", userBox.Text);
                ca.Parameters.AddWithValue("@firstname", firstNameBox.Text);
                ca.Parameters.AddWithValue("@dob", dayDobList.Text + monthDobList.Text + yearDobList.Text);
                ca.Parameters.AddWithValue("@gender", genderList.Text);
                ca.Parameters.AddWithValue("@password", passwordBox.Text);

                connect.Open();
                ca.ExecuteNonQuery();
                connect.Close();

                if (IsPostBack)
                {
                    userBox.Text = "";
                    firstNameBox.Text = "";
                    dayDobList.Text = "";
                    monthDobList.Text = "";
                    yearDobList.Text = "";
                    genderList.Text = "";
                    passwordBox.Text = "";
                }
            }
        }
    }
}

【讨论】：