Register.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.IO;
using System.Security.Cryptography;
using MySql.Data.MySqlClient;

namespace BBS
{
    public partial class Register : Form
    {
        // 定义全局变量
        public static string pathPicture; // 定义全局变量，用于存放头像图片路径
        public Byte[] mybyte = new byte[0]; // 用于存取图片二进制数据

        public Register()
        {
            InitializeComponent();
        }

        private void Register_Load(object sender, EventArgs e)
        {
            // 窗体初始化设置
            // 输入框内容为空
            textBox_username.Text = "";
            textBox_phone.Text = "";
            textBox_email.Text = "";
            textBox_password.Text = "";
            // 错误提示tip不可见
            label_username_tip.Visible = false;
            label_phone_tip.Visible = false;
            label_email_tip.Visible = false;
            label_password_tip.Visible = false;
            
        }

        // MD5加密算法
        private string EncryptWithMD5(string source)//MD5加密
        {
            byte[] sor = Encoding.UTF8.GetBytes(source);
            MD5 md5 = MD5.Create();
            byte[] result = md5.ComputeHash(sor);
            StringBuilder strbul = new StringBuilder(40);
            for (int i = 0; i < result.Length; i++)
            {
                strbul.Append(result[i].ToString("x2"));//加密结果"x2"结果为32位,"x3"结果为48位,"x4"结果为64位
            }
            return strbul.ToString();
        }

        private void pictureBox_avatar_Click(object sender, EventArgs e)
        {
            //设置文件对话框显示的初始目录为系统桌面
            this.openFileDialog1.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);