学生成绩查询系统

1，登录界面的设计

  1 using System;
  2 using System.Collections.Generic;
  3 using System.ComponentModel;
  4 using System.Data;
  5 using System.Drawing;
  6 using System.Linq;
  7 using System.Text;
  8 using System.Threading.Tasks;
  9 using System.Windows.Forms;
 10 using System.Data.SqlClient;
 11 using System.Reflection;
 12 
 13 
 14 namespace WindowsFormsApplication2
 15 {
 16     public partial class Form0 : Form
 17     {
 18         public Form0()
 19         {
 20             InitializeComponent();
 21         }
 22 
 23         //SqlConnection conn = new SqlConnection("server=.;database=wisystem;integrated security=true;");
 24 
 25         /*窗体间的传值*/
 26         public static string username = string.Empty; 
 27 
 28         private void button1_Click(object sender, EventArgs e)      //login
 29         {
 30             if (ID.Text == "" || Passwd.Text == "" || ID.TextLength < 5 )
 31             {
 32                 MessageBox.Show("请输入完整的信息", "信息提示",
 33                 System.Windows.Forms.MessageBoxButtons.OK,
 34                 System.Windows.Forms.MessageBoxIcon.Warning);
 35                 ID.Text = "输入账号";
 36                 Passwd.Text = "请输入密码";
 37             }
 38             else if (ID.Text != "" && Passwd.Text != "")
 39             {
 40                 string connection = "Data Source=.;integrated security = SSPI;Initial Catalog=wisystem;";
 41                 SqlConnection con = new SqlConnection(connection);
 42                 con.Open(); 
 43                 string strsql = "select ID,Passwd from user$  where ID='" + ID.Text.ToString().Trim() 
 44                     + "' and Passwd='" + Passwd.Text.ToString().Trim() + "'";
 45                 DataSet ds = new DataSet();
 46                 SqlDataAdapter da = new SqlDataAdapter(strsql, con);
 47                 da.Fill(ds);
 48                 string c = this.Identify.SelectedIndex.ToString ();
 49 
 50                 if (ds.Tables[0].Rows.Count > 0 && (ID.Text.ToString() == "admin") && Convert.ToInt32(Identify.SelectedIndex.ToString()) == 0)
 51                 {
 52 
 53                     MessageBox.Show("登录成功", "提示");
 54                     Form1 form1 = new Form1();
 55                     form1.Show();
 56                     this.Hide();
 57                 }
 58                 else
 59                     if(ds.Tables[0].Rows.Count > 0 && (ID.Text.ToString() == "admin") && Convert.ToInt32(Identify.SelectedIndex.ToString()) == 1)
 60                 {
 61                     MessageBox.Show("身份验证错误,已更改身份", "提示信息", System.Windows.Forms.MessageBoxButtons.YesNo, System.Windows.Forms.MessageBoxIcon.Warning);
 62                     Identify.SelectedIndex = 0;
 63                 }
 64                     else
 65                         if (ds.Tables[0].Rows.Count > 0 && (Passwd.Text.ToString() == "123456") && Convert.ToInt32(Identify.SelectedIndex.ToString()) == 1)
 66                         {
 67                             MessageBox.Show("登录成功", "提示");
 68                             username = ID.Text;
 69                             Form4 form4 = new Form4();
 70                             form4.Show();
 71                             this.Hide();
 72                         }
 73                         else
 74                             if (ds.Tables[0].Rows.Count > 0 && (Passwd.Text.ToString() == "123456") && Convert.ToInt32(Identify.SelectedIndex.ToString()) == 0)
 75                             {
 76                                 MessageBox.Show("身份验证错误,已更改身份", "提示信息",System .Windows .Forms .MessageBoxButtons .OK,  System.Windows.Forms.MessageBoxIcon.Warning);                               
 77                                 Identify.SelectedIndex = 1;
 78                             }
 79                             else
 80                             {
 81                                 MessageBox.Show("用户名或密码输入错误！");
 82                             }
 83                 con.Close();              
 84             }
 85         }
 86 
 87         private void Form0_Load(object sender, EventArgs e)
 88         {
 89             Identify.SelectedIndex = 1;
 90             ID.Text = "输入账号";
 91             Passwd.Text = "请输入密码";
 92             timer1.Enabled = true;
 93         }
 94 
 95         private void ID_MouseClick(object sender, MouseEventArgs e)
 96         {
 97             ID.Text = "";
 98             Passwd.Text = "";
 99         }
100 
101         private void Passwd_KeyDown(object sender, KeyEventArgs e)
102         {
103             Passwd.PasswordChar = '*';
104         }
105 
106         private void timer1_Tick(object sender, EventArgs e)
107         {       
108             this.label4.Left -= 2;
109             if (label4.Right < 0)
110             {
111                 this.label4.Left = 900;
112             }
113             
114         }
115 
116         private void timer2_Tick(object sender, EventArgs e)
117         {
118             this.textBox1.Text = DateTime.Now.ToString();
119         }
120 
121     }
122 }

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