C# windows 窗体检查所有条目然后显示消息框

Question

我正在制作一个 C# Windows 窗体来检查所有条目，当所有条目都有效时，将出现一个消息框，但我需要帮助确保所有条目都有效并显示一个消息框。做这一切可能更容易，但不妨学习如何做这一切。这是我目前所拥有的。

private void btn_submit_Click(object sender, EventArgs e)
    {
        string name = txt_name.Text;
        string email = txt_email.Text;
        string address = txt_address.Text;
        string course = txt_course.Text;
        string phone = txt_phone.Text;


        if (name.Length < 8)
        {
            txt_name.Text = "Invalid Name";
            txt_name.ForeColor = Color.Red;
        }
        else
        {
            txt_name.ForeColor = Color.Green;

        }

        if (email.Contains('@'))
        {
            if (email.Contains(".com") || email.Contains(".COM"))
            {

                txt_email.ForeColor = Color.Green;
            }
            else
            {
                txt_email.Text = "invalid Email";
                txt_email.ForeColor = Color.Red;
            }
        }
        else
        {
            txt_email.Text = "invalid Email";
            txt_email.ForeColor = Color.Red;
        }

        if (address.Length < 12)
        {
            txt_address.Text = "invalid Address";
            txt_address.ForeColor = Color.Red;
        }
        else
        {
            txt_address.ForeColor = Color.Green;
        }
       if (course.Contains("Games Design") || course.Contains("Electronics") || course.Contains("Mobile Communications") || course.Contains("GAMES DESIGN") || course.Contains("ELECTRONICS") || course.Contains("MOBILE COMMUNICATIONS"))
        {
            txt_course.ForeColor = Color.Green;
        }
        else
        {
            txt_course.Text = "invalid Course";
            txt_course.ForeColor = Color.Red;
        }

       if (phone.Length < 8)
        {
            txt_phone.Text = "invalid Phone Number";
            txt_phone.ForeColor = Color.Red;
        }
       else
        {
            txt_phone.ForeColor = Color.Green;
        }

    }

Answer 1

您可以在验证失败的任何地方添加一个 bool 值并将其设置为 false。

private void btn_submit_Click(object sender, EventArgs e)
{
    string name = txt_name.Text;
    string email = txt_email.Text;
    string address = txt_address.Text;
    string course = txt_course.Text;
    string phone = txt_phone.Text;
    bool formIsValid = true;


    if (name.Length < 8)
    {
        txt_name.Text = "Invalid Name";
        txt_name.ForeColor = Color.Red;
        formIsValid = false;
    }
    else
    {
        txt_name.ForeColor = Color.Green;

    }

    if (email.Contains('@'))
    {
        if (email.Contains(".com") || email.Contains(".COM"))
        {

            txt_email.ForeColor = Color.Green;
        }
        else
        {
            txt_email.Text = "invalid Email";
            txt_email.ForeColor = Color.Red;
            formIsValid = false;
        }
    }
    else
    {
        txt_email.Text = "invalid Email";
        txt_email.ForeColor = Color.Red;
        formIsValid = false;
    }

    if (address.Length < 12)
    {
        txt_address.Text = "invalid Address";
        txt_address.ForeColor = Color.Red;
        formIsValid = false;
    }
    else
    {
        txt_address.ForeColor = Color.Green;
    }
   if (course.Contains("Games Design") || course.Contains("Electronics") || course.Contains("Mobile Communications") || course.Contains("GAMES DESIGN") || course.Contains("ELECTRONICS") || course.Contains("MOBILE COMMUNICATIONS"))
    {
        txt_course.ForeColor = Color.Green;
    }
    else
    {
        txt_course.Text = "invalid Course";
        txt_course.ForeColor = Color.Red;
        formIsValid = false;
    }

   if (phone.Length < 8)
    {
        txt_phone.Text = "invalid Phone Number";
        txt_phone.ForeColor = Color.Red;
        formIsValid = false;
    }
   else
    {
        txt_phone.ForeColor = Color.Green;
    }

    if (formIsValid)
    {
        //submit the form
    }
    else
    {
        MessageBox.Show("Your error message here");
    }

}