【从头到尾 - 餐饮管理系统】 - （五）

//引入相应的命名空间
using System.Data.SqlClient;

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

//引入相应的命名空间
using System.Data.SqlClient;

namespace CYMS
{
    public partial class Frm_Login : Form
    {
        public Frm_Login()
        {
            InitializeComponent();
        }

        #region 加载事件
        /// <summary>
        /// 加载事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Frm_Login_Load(object sender, EventArgs e)
        {
            //绑定皮肤
            Sunisoft.IrisSkin.SkinEngine s = new Sunisoft.IrisSkin.SkinEngine();
            s.SkinFile = @"C:\Users\Administrator\Desktop\DeepCyan.ssk";
        } 
        #endregion

        #region 登录
        /// <summary>
        /// 登录
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_OK_Click(object sender, EventArgs e)
        {
            //判断文本框是不是为空
            if (this.txt_Pwd.Text.Trim() == "" || this.txt_UserName.Text.Trim() == "")
            {
                MessageBox.Show("账户或密码不能为空！", "提示");
                return;
            }

            //参数化数据
            SqlParameter[] para = new SqlParameter[]
            {
                new SqlParameter("@UserName", this.txt_UserName.Text.Trim()),
                new SqlParameter("@Pwd", this.txt_Pwd.Text.Trim())
            };

            //编写SQL语句
            string sql = "SELECT PowerName FROM Tb_User WHERE UserName = @UserName AND Pwd = @Pwd";

            //执行SQL语句
            string PowerName = (string)Command.SQLHelper.ExcuteScalar(sql, para);

            //判断获得的权限名称是不是为空，如果为空，则代表无此账户信息
            if (PowerName != null)
            {
                //进入主窗体
                Frm_Main f = new Frm_Main();
                //传递参数
                f.name = this.txt_UserName.Text;
                f.power = PowerName;
                //隐藏登录窗体
                this.Hide();
                f.Show();
            }
            else
            {
                MessageBox.Show("无此账户信息！", "提示");
            }
        } 
        #endregion

        #region 回车登录
        /// <summary>
        /// 回车登录
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void txt_Pwd_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Enter)
            {
                this.btn_OK_Click(sender, e);
            }
        } 
        #endregion

        #region 退出事件
        /// <summary>
        /// 退出事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_Exit_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("是否退出？","提示") == System.Windows.Forms.DialogResult.OK)
            {
                this.Close();
            }
        } 
        #endregion
    }
}