C#学生撤回给你寄管理系统教程之登录界面设计

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1，首先，打开Visual Studio 2015版本，新建Windows窗体应用程序

结果：

2，点击右侧工具箱，如果右侧没有，则在视图里面找到工具箱点击，拖拽三个label，两个textbox，两个button控件

一些属性值大家可以自行设置，我在这只讲几个我认为不好找的一些属性值

如果要添加背景图片，则需要把label，button背景改为透明，如果不改则会像下图一样

改的方法：label backcolor属性中web下点击Transparent,

效果如下：

下面开始写登录事件处理

双击登录按钮进入

private void button1_Click(object sender, EventArgs e)
{

}

这个函数，

下面是我写的代码

 private void login_Click(object sender, EventArgs e){string account = AccountBox.Text;string password = PasswordBox.Text.ToString();if (student.Checked){Student student = new Student(account, password);loginCheck check = new loginCheck(student);check.checkStudent();//进行账号密码判断if (check.UserError){if (check.PasswordError){this.Hide();new studentForm().Show();}else{//errorprovider控件提示信息this.errorProvider1.SetError(this.PasswordBox, "密码错误");}}else{//errorprovider控件提示信息this.errorProvider1.SetError(this.AccountBox, "不存在用户名");}}else if (teacher.Checked){Teacher teacher = new Teacher(account, password);loginCheck check = new loginCheck(teacher);check.checkTeacher();//进行账号密码判断if (check.UserError){if (check.PasswordError){this.Hide();new teachFrom().Show();}else{//errorprovider控件提示信息this.errorProvider1.SetError(this.PasswordBox, "密码错误");}}else{//errorprovider控件提示信息this.errorProvider1.SetError(this.AccountBox, "不存在用户名");}}}

中间有用到其他类里面的函数

代码如下：

using System;
using System.Data.SqlClient;
using System.Security.Cryptography;
using System.Windows.Forms;namespace MyClass
{/** 学生登录账号密码类*/public class Student{private String _ID;private String _password;public Student(){}public Student(String ID, String password){this._ID = ID;this.Password = password;}public string ID{get{return _ID; }set { _ID = value; }}public string Password{get{  return _password; }set{ _password = value; }}}/** 教师登录账号密码类* */public class Teacher{private String _ID;private String _password;public Teacher(String ID, String password){this._ID = ID;this.Password = password;}public string ID{get { return _ID; }set { _ID = value; }}public string Password{get {return _password; }set { _password = value;}}}/** 登录判断类*/public class loginCheck{private Student student;private Teacher teacher;private Boolean userError = false;private Boolean passwordError = false;private SqlConnection conn;private string pass;public bool UserError{get{return userError;  }set { userError = value; }}public bool PasswordError{get { return passwordError; }set {  passwordError = value; }}//private public loginCheck(Student student){this.student = student;student.Password = new passwordEncryption().MD5(student.Password);}public loginCheck(Teacher teacher){this.teacher = teacher;teacher.Password = new passwordEncryption().MD5(teacher.Password);}private void SQL(){conn = new SqlConnection("server=.;uid=sa;pwd=sq0318..;database=数据库综合实验");pass = null;conn.Open();}private void SQL_1(string sqlStr){SqlCommand cmd = new SqlCommand(sqlStr, conn);SqlDataReader dr = cmd.ExecuteReader();while (dr.Read()){pass = dr["password"].ToString();UserError = true;}if (UserError == true){if (teacher.Password == pass){PasswordError = true;}}}public void checkStudent(){SQL();string sqlStr = "select * from student where Sno = '" + student.ID + "'";SQL_1(sqlStr);}public void checkTeacher(){SQL();string sqlStr = "select password from teacher where Tno = '" + teacher.ID + "'";SQL_1(sqlStr);}}/**  密码进行加密类 */public class passwordEncryption{/** 密码加密方法*/public String MD5(String s){char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6','7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };try{byte[] btInput = System.Text.Encoding.UTF8.GetBytes(s);// 获得MD5摘要算法的 MessageDigest 对象MD5 mdInst = System.Security.Cryptography.MD5.Create();// 使用指定的字节更新摘要mdInst.ComputeHash(btInput);// 获得密文byte[] md = mdInst.Hash;// 把密文转换成十六进制的字符串形式int j = md.Length;char[] str = new char[j * 2];int k = 0;for (int i = 0; i < j; i++){byte byte0 = md[i];str[k++] = hexDigits[(int)(((byte)byte0) >> 4) & 0xf];str[k++] = hexDigits[byte0 & 0xf];}return new string(str);}catch{// Console.Error.WriteLine(e.StackTrace);return null;}}}
}

以上截图是我写好之后又重新弄得一个工程进行截得图，下面是我自己的截图