loginclass.cs

用C#与SQL2005写的一个简单的图书管理系统.主要功能:图书及学生信息的添加修改与删除 图书的借出与归还 图书信息的模糊查询.

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;

namespace BooksM.MyClass
{
    class LoginClass
    {
        public static string userName;
        public static int loginOK;
        public LoginClass()
        {
        }
        public int GetLoginOk
        {
            get { return loginOK; }
            set { loginOK = value; }
        }
        public string ReadWriteUserName
        {
            get { return userName; }
            set { userName = value; }
        }
        public SqlConnection ConnectDB()
        {
            ConnData myConnData=new ConnData();
            SqlConnection mySqlConnect = myConnData.ConnectDB();
            return mySqlConnect;
        }
        public void Initialization(ref TextBox myTextBox1, ref TextBox myTextBox2)
        {
            if (myTextBox1.Text.Trim().Length != 0)
            {
                myTextBox1.Text = "";
            }
            if (myTextBox2.Text.Trim().Length != 0)
            {
                myTextBox2.Text = "";
            }
            myTextBox2.PasswordChar = '*';
        }
        public void Login(ref TextBox myTextBox1, ref TextBox myTextBox2, Form myMainForm)
        {
            if (myTextBox1.Text.Trim().Length == 0)
            {
                MessageBox.Show("输入的用户名不能为空！", "提示");
                myTextBox1.Focus();
                return;
            }
            if (myTextBox2.Text.Trim().Length == 0)
            {
                MessageBox.Show("输入的用户密码不能为空！", "提示");
                myTextBox2.Focus();
                return;
            }
            SqlCommand mySqlCommand = new SqlCommand(@" 
                                                       select *
                                                       from UserInfor", ConnectDB());
            SqlDataReader myDataReader = mySqlCommand.ExecuteReader();
            while (myDataReader.Read())
            {
                if (myDataReader.GetValue(0).ToString() == myTextBox1.Text.Trim())
                {
                    if (myDataReader.GetValue(1).ToString() == myTextBox2.Text.Trim())
                    {
                        this.GetLoginOk= 1;
                        myMainForm.ShowDialog();
                        return;
                    }
                    else
                    {
                        MessageBox.Show("输入的密码错误！", "提示");
                        myTextBox2.Text = "";
                        myTextBox2.Focus();
                        return;
                    }
                }
                else
                {
                    myTextBox1.Focus();
                    continue;
                }
            }
            MessageBox.Show("输入的用户名错误！", "提示");
            myTextBox1.Text = "";
            myTextBox2.Text = "";
            myTextBox1.Focus();
            return;
        }
    }
}